Archive for April 2016

New 2016 Camaro Convertible is Here

The all-new 2016 Camaro Convertible (Fig. 1) is rolling into Chevrolet dealerships across the country. The convertible model is offered in the same trim levels and powertrain configurations as the Camaro coupe, including the new 2.0L 4-cylinder turbocharged engine (RPO LTG).


The 2016 Chevrolet Camaro convertible benefits from a stiffer, lighter structure that helps reduce total vehicle weight by at least 200 pounds compared to the model it replaces. In addition, it introduces the most sophisticated convertible top in the segment, with fully automatic operation, hard tonneau cover, and the ability of opening or closing at speeds up to 30 mph.

Fig. 1


Power Folding Top


The operation of the convertible top is fully automatic. Press the folding top switch and the control module latches and unlatches the convertible top while hydraulic power actuation provides the force to raise and lower the top.


Features of the 2016 Camaro Convertible include:

• The convertible top power switch, located on the overhead console, must be held active for the full range of motion. Cycle time is approximately 20 seconds. • The hard tonneau cover (Fig. 2) automatically cycles with the convertible top. • All windows lower automatically when operating the top. • Seals on the top provide a clean appearance to the header. • The convertible top can be operated at speeds up to 30 mph (48 km/h). • The convertible top can be opened remotely using the key fob. Press and hold the convertible top button on the key fob to lower the top.


The 2016 Chevrolet Camaro convertible benefits from a stiffer, lighter structure that helps reduce total vehicle weight by at least 200 pounds compared to the model it replaces. In addition, it introduces the most sophisticated convertible top in the segment, with fully automatic operation, hard tonneau cover, and the ability of opening or closing at speeds up to 30 mph.

Fig. 2


The folding top control module determines folding top movement by controlling the activation and direction of the hydraulic pump’s electric motor and three solenoid valves based on inputs and vehicle status information it receives via low speed GMLAN. The folding top control module also contains an internal thermocouple, which it uses to measure the outside ambient temperature and take into account its effect on the hydraulic fluid. This internal thermocouple value is not accessible. The top will not operate in cold weather below 32° F (0° C).


Luggage Barrier Partition


Before operating the convertible top, the luggage barrier partition in the trunk (Fig. 3) must be in the fastened position with no objects forward of the partition and the trunk must be closed. The partition ensures there is an area for the folding top to retract into.


F03 Camaro Trunk

Fig. 3


The barrier contains a magnet and fits over the folding top luggage barrier sensor post. The folding top luggage barrier sensor is sensitive to the presence or absence of the magnetic field produced by this magnet. When the luggage barrier is deployed and properly seated in the retainer, the magnet is close enough to change the sensor’s output current into the 2 to 7ma range and the sensor is considered active.


The convertible top uses sensors to determine the proper stowage compartment lid position, top tension bow position, and top up/down position — all which provide signals to the control module whether the top is in the up or down position or fully retracted and in the stowed position.


If the top is left in a not fully closed or open state, the hydraulic pressure will be released after approximately two minutes and the top can be operated manually.


System Protection


Normal operation of the folding top system may be altered by one of the following events:


Obstacle Detection – If an excessive current draw is detected while the folding top motor is operating for a defined period of time, the folding top control module will turn off the folding top motor to prevent overheating or damage to the mechanical structure of the top.


Folding Top System Thermal Protection – The folding top control module has a thermal protection algorithm to protect the folding top pump motor from damage due to overheating conditions resulting from excessive motor actuation. After the thermal protection has been triggered any new power convertible top command in the open direction will be ignored until the motor is allowed to cool. A close request during an over temperature condition will be allowed.


Power Windows


All windows lower automatically when operating the convertible top. Operation of the windows using the power window switches on the driver’s door (Fig. 4) is based on whether the front or rear window indicator is activated. This switch operation is different than the previous generation Camaro.


Press the front (Fig. 4, A) or rear (Fig. 4, B) window button first to select the desired window, and then press the left (Fig. 4, C) or right (Fig. 4, D) window switch to open/close the window. All four windows cannot be closed at the same time.


TIP: Raise the rear windows before the front windows to help ensure proper convertible top sealing.


F04 camaro window switch copy

Fig. 4


TAC Action Center


A Technical Assistance Center (TAC) Action Center has been established to support the Camaro convertible. In the U.S., call the TAC Action Center regarding convertible-specific issues.


– Thanks to Ann Briedis

Buick Debuts the New Cascada Convertible

The all-new 2016 Cascada (Fig. 5), Buick’s first convertible in a quarter of a century, blends performance, sophistication and innovation in an appealing mix that will delight those who love open-air driving.


F05 cascada 1

Fig. 5

Powertrain Features


The Cascada comes standard with an exclusive 1.6L turbocharged 4-cylinder engine (RPO LWC) (Fig. 6) that produces 200 hp and 206 lb.-ft. of torque. An overboost feature allows the engine to increase torque to 221 lb.-ft. Direct injection and variable valve timing complement the turbocharged engine’s performance.


F06 cascada engine

Fig. 6


The cylinder block is a hollow cast aluminum frame structure with five main journals. The cylinder head is a dual overhead camshaft (DOHC) design made of cast aluminum alloy with four valves per cylinder. The engine uses a crankshaft harmonic damper to control torsional vibration and has an integrated one-way clutch with reduced NVH for the drive belt system.


Premium unleaded gasoline with an octane rating of 91 or higher is recommended. Regular unleaded gasoline rated at 87 octane or higher can be used but acceleration and fuel economy will be reduced, and an audible knocking noise may be heard.


The engine is paired with a HydraMatic™ 6T45 6-speed automatic transmission (RPO MH7). (Fig. 7) The transmission is an electronically controlled, automatic overdrive transaxle with an electronically controlled torque converter clutch,


F07 cascada transFig. 7


When performing fluid checks, refer to the appropriate Service Information for the proper procedure, as the compact design of the transmission makes it crucial to maintain the proper levels. The transmission fluid level must be checked when the transmission fluid temperature is between 185–203°F (85–95°C). The engine must be running when the transmission fluid oil level check plug is removed.


Brakes and Suspension


The Cascada is equipped with a Continental Teves Mk60/Mk70 brake system. The electronic brake control module and the brake pressure modulator valve assembly are serviced separately.


The HiPer Strut Front Suspension features dual-path top mountings that separate the transfer of spring and damper loads to the body structure. This provides improved tire contact with the pavement under load, reduced torque steer and more responsive steering. The Watts Z-Link Rear Suspension — lighter than traditional systems — helps center the axle during cornering for a more balanced driving experience.


Doors and Trunk Access


The central locking switch locks and unlocks both doors, the trunk, and the fuel door.


The Remote Keyless Entry (RKE) transmitter also controls the fuel door lock and unlock feature. Press the unlock button on the key fob to unlock both doors, trunk and the fuel door.


To open the trunk, the vehicle must be off or the shift lever must be in Park. Press the lower half of the emblem on the trunk lid to open the trunk. (Fig. 8)


F08 cascada trunk

Fig. 8


Safety Belt Presenters


The electronic rear seat entry system automatically powers the front seats forward by simply pressing the seatback forward. It moves the seats rearward when the seatback is returned to the upright position.


The electric safety belt presenters, mounted at shoulder level behind the doors, use telescopic arms to slide the upper front safety belt assemblies from behind the front seat into closer reach for easier buckling. (Fig. 9)


F09 cascada seat belt

Fig. 9


The seat belt presenters are operated by the Folding Top Control Module. They are fully automatic and are triggered when the doors are closed and the ignition is on. If resistance to movement is detected, the presenters will reverse and then extend again.


The Cascada offers several optional advanced safety features that employ camera sensors. Forward Collision Alert (FCA) provides a visual alert on the Driver Information Center — along with beeps — when approaching another vehicle too quickly. (FCA operates at speeds of 25 mph or above.) In addition, Lane Departure Warning will alert the driver with a flashing amber indicator should the vehicle change lanes at 35 mph or greater without using a turn signal. Other driver assistance features include the Rear Vision Camera and available front and rear park assist.


Stay Connected


The latest in voice-recognition and touch-screen technology is seamlessly integrated into the Buick IntelliLink™ infotainment system, Plus, passengers can stay connected to the internet and their favorite apps with the OnStar® 4G LTE built-in Wi-Fi hotspot.


Servicing Cascada


Technicians may need to use a Low Profile Lift Arms System to avoid contact with the Cascada’s body and structure.


When utilizing a frame-contact lift, place the front and rear lift pads on the rocker outer panel weld flanges. (Fig. 10) When using a service jack under the front or rear of the vehicle, use the same locations.


F10 cascada lift

Fig. 10


Special Tools

Screen Shot 2016-05-16 at 11.42.30 AM













– Thanks to Steve Bruder and Sherman Dixon

Cascada Convertible Top Operation and Service

As with any convertible, the new Buick Cascada’s first impression starts at the top — in this case, a premium soft top driven by an electro-hydraulic power roof system. (Fig. 11) It is made from traditional fabric with a fleece lining for superior acoustics and thermal insulation.


F11 cascada convertible

Fig. 11


Take It from the Top


Operation of the roof involves just one switch located on the center console, with the ability to lower the top in just 17 seconds at speeds up to 31 mph. The top stores neatly under a hard tonneau cover that sits beneath the car’s belt line.


TIP: Before operating the convertible top, the trunk cargo partition must be in the lowered position and the trunk must be closed.


Rollover Protection System


A reinforced torsion box bulkhead behind the rear seats incorporates the Rollover Protection System, which includes a reinforced windscreen frame and spring-loaded, pyrotechnically activated, pop-up rollover bars. (Fig. 12) When deployed, the rollover bars will extend approximately 14-inches (356 mm) to match the height of the windshield.


F12 cascada convertible rollover

Fig. 12


The Rollover Protection System is controlled by the Inflatable Restraint Sensing and Diagnostic Module (SDM). The system activates during a vehicle rollover, head-on collision or side impact. The system deploys with the soft top opened or closed.


In the event of a vehicle rollover, head-on collision or side impact, the pyrotechnically activated, spring-loaded bars behind the rear seats deploy upwards automatically within milliseconds. (Fig. 13) They also deploy together with the front and side airbag systems. Objects should not be placed on the covers behind the head restraints.


F13 cascada convertible popup locationFig. 13


SIR safe handling and storage warnings apply to the rollover bars. Replacement rollover bars are shipped to the dealership ready to install and they should be handled and stored the same as an airbag.


Convertible Top Service Tools


If the convertible top anchor plates have been moved on the Cascada, causing the convertible top to be misaligned to the body, special tool BO-51074-NA Convertible Top Alignment Tool is required to align the hinges to the body and re-establish anchor plate location.


The tool BO-51074-NA is not required for removal and installation of the convertible top assembly as long as the anchor plates are not moved out of position.


Due to the size and cost of tool BO-51074-NA, Buick dealerships WILL NOT automatically receive this special tool kit as part of the Essential Tool Program. Tool BO-51074-NA is only available for loan via 1-800-GM-TOOLS and ships from Owatonna, MN via a common freight carrier. There is an estimated $1,300.00 charge applied to cover transportation costs due to the 450 lbs. of shipping weight. The tool must be returned no more than 10 business days after receipt. Damaged or non-returned tool kits may incur a charge of $8,800.00 USD debited to the dealership’s Parts Account.


Additionally, for stowage compartment hinge adjustment, tool BO-51074-30 is required and only available for loan via 1-800-GM-TOOLS. There is an estimated $100 charge applied to cover transportation costs.


– Thanks to Steve Bruder and Sherman Dixon

Vented and Non-Vented Slip Yokes

Technicians diagnosing a transmission fluid leak from the rear of the transmission on 2014-2016 Silverado and Sierra 2WD models may notice the fluid is coming from the plug in the propeller shaft slip yoke.


2WD trucks use a vented slip yoke that has a small hole in the plug. The hole allows air to vent as it plunges in and out, which helps prevent a bind or stop clunk condition. The vented slip yoke is sealed by a propeller shaft oil seal sleeve on the output shaft of the transmission. (Fig. 14)

F14 slip yoke trans

Fig. 14


If fluid is leaking out of the hole in the vented slip yoke on a 2WD truck, the propeller shaft oil seal sleeve has failed and needs to be replaced, not the slip yoke.


In addition, be sure not to replace a vented slip yoke (Fig. 15, A) with a non-vented slip yoke (Fig. 15, B) that is used on 4WD vehicles. This is not the proper repair for the leaking seal and it will cause a bind condition in the slip yoke as it fills with transmission fluid.


F15 slip yokes image

Fig. 15


– Thanks to Kevin Minor

Foam and Cardboard Insert for Tire Inflator Kit

During the pre-delivery inspection on the 2016-2017 Volt, a piece of foam that is surrounded by a cardboard shell (Fig. 16) will be found in the trunk. Do not discard these parts.


F16 cardboard insert

Fig. 16


The cardboard shell is a spacer for the tire inflator kit. Insert the spacer between the compressor assembly and the tire sealant canister. (Fig. 17) The spacer prevents any damage to the contents of the tire inflator kit bag when tightening the hold down for the tire inflator kit.


F17 bag 2

Fig. 17


– Thanks to Chuck Wieseckel

Emergency Trunk Release Handle Interference

The power trunk may not open when using the Remote Keyless Entry transmitter (key fob) or the touch pad on the trunk on some 2016 Malibu models. During an attempted activation of the power trunk, a low volume audible click may be heard.


Check the Emergency Trunk Release (ETR) handle for interference with the trunk trim material. (Fig. 18) The interference may be caused by the handle being positioned incorrectly at the opening in the trunk lid trim panel or by being moved by items in the trunk.


F18 etr handle 1

Fig. 18


Interference from the trim can cause the handle and cable to bind. Any sort of preload on the cable will not allow the latch to release when any of the electric switches are used.


Open the trunk by entering the trunk through the rear seat access and pulling the ETR handle. To correct the interference, modify the trunk lid trim panel to provide more clearance around the ETR handle. (Fig. 19)


F19 etr handle 2

Fig. 19


Remove the rear compartment lid inner trim panel and, on the back side of the trim panel, mark off and remove approximately 5-10 mm (0.20-0.40 in.) from the outboard, raised side of the opening. (Fig. 20)


F20 etr handle 3

Fig. 20


Reinstall the rear compartment lid inner trim and confirm proper operation of the handle and the power trunk release switches.


– Thanks to Dallas Walton

Proper Oil Filter Replacement Helps Prevent Engine Damage

Modern engine technologies used in GM passenger cars and trucks today require different oil filtration needs than in the past. Bearing clearances are tighter, and the replacement of lead overlay to aluminum overlay bearings has put an increased significance on oil filtration. Proper oil filtration is dependent on oil filter paper area and paper filtration efficiency.


New technologies also have increased oil flow rate, leading to higher engine pressure differentials across the oil filter and requiring higher oil filter bypass settings. Oil filters made by different manufacturers may have significantly lower oil filter bypass settings than required by today’s GM engines, resulting in unfiltered oil to the engine bearings and accelerated bearing wear. Some engine oil filters with the same exterior dimensions may have filters with reduced paper area, which is achieved by reducing the number of pleats.


Oil filter misapplication may cause abnormal engine noise or internal damage. Refer to the most recent parts information to ensure the correct part number filter is installed when replacing an oil filter. When selecting a filter, do not rely on physical dimensions alone. Counterfeit copies of name brand parts have been discovered in some aftermarket parts systems. Be sure that the parts being installed are from a trusted source.


Engine damage resulting from an incorrect or improperly installed engine oil filter is not a warrantable claim. The best way to avoid oil filter quality concerns is to purchase ACDelco® oil filters directly from GM Customer Care and Aftersales. (Fig. 21)

F21 oil filter 1

Fig. 21


Refer to the appropriate Service Information installation instructions when replacing any oil filter. It’s important to follow the correct procedure for proper cartridge filter element alignment. (Fig. 22)


F22 oil filter 2

Fig. 22


If the diagnostics in the Service Information lead to the oil filter as the cause of internal engine noise or damage, submit a field product report. In the U.S., refer to Bulletin #02-00-89-002 for more information on submitting a field product report. (In Canada, refer to Bulletin #10-00-89-006.)


– Thanks to Tracy Lucas

Upper and Lower Oil Pan Parts Restriction

The upper oil pan (part number 12637301) (Fig. 23) and lower oil pan (part number 12637773) (Fig. 24) used on 2016 Encore, Cruze, Malibu, Spark and 2016-2017 Volt models equipped with engine RPO L3A, LE2, LFV or LV7 is on part restriction.


F23 oil pan upper

Fig. 23


F24 oil pan lower

Fig. 24


Before performing any repairs, inspect for an engine oil leak. If the leak appears to be from an area of the engine other than the oil pan, follow the appropriate Service Information diagnostics.


If the leak appears to be from the oil pan area, do not remove the lower oil pan from the upper oil pan. Take a clear photo of the oil leak as observed. Next, clean the affected area and add engine oil dye. Run the engine until the oil leak dye can be detected.


If the leak is confirmed to be at the upper or lower oil pan, mark the location of the oil leak on the oil pan by circling the leak or drawing an arrow pointing to the leak. Take a clear photo of the leak. Contact the Product Quality Center to order parts.


– Thanks to Raymond Haglund

All-New 2016 Cruze Arrives

Redesigned from the ground up, the all-new 2016 Cruze (Fig. 1) — Chevrolet’s best-selling global car — is larger, lighter, more efficient and more advanced than ever. The new Cruze is available in four models: L, LS, LT and Premier.


F01 Cruze 2016 profile

Fig. 1


The compact sedan measures about three inches longer and nearly an inch shorter (in height) than the previous model. In addition, a strong yet light body structure — resulting from a curb weight that’s about 250 pounds (113 kg) less than its predecessor — enhances the Cruze’s agility and efficiency.


Efficient Power


Under the hood resides a standard all-new Ecotec 1.4L turbocharged four cylinder engine (RPO LE2) (Fig. 2) that employs direct fuel injection, variable valve timing and available Stop/Start technology (on 6-speed automatic transmission-equipped models). It generates 153-hp and delivers up to an estimated 42 mpg (5.6 L/100km) on the highway.


TIP: The hood release uses a double-pull mechanism. To open the hood, pull and release the handle on the lower-left side of the instrument panel. Pull and release the handle again to fully open the hood. There is not a secondary latch under the hood.


F02 Cruze engine 4409178

Fig. 2


The aluminum cylinder block and head with an integrated DOHC cylinder head/exhaust manifold help to reduce engine weight. While the variable-flow oiling system with a 2-stage variable displacement oil pump add to engine’s fuel efficiency.

The turbocharger consists of a turbine and a compressor on a common shaft. The shaft bearing is constructed for higher rotation speed and lubricated by engine oil. The turbocharger is water cooled for improved durability.


On models equipped with the automatic transmission, the Stop/Start system may turn OFF the engine temporarily when the brake is applied and the vehicle comes to a complete stop. The audio system, climate controls and other accessories continue to operate. Upon releasing the brake pedal or applying the accelerator, the engine restarts. The engine may continue running or restart when the vehicle is stopped if certain operating conditions are not met.


TIP: Some customers may notice clicking noise or feel a detent when depressing the accelerator pedal all the way down. This is normal operation. There is a wide open throttle detent switch that provides the driver with feedback when full accelerator pedal travel has been reached.


Depending on model, the Cruze features the M32 6-speed manual transmission (RPO MF3) or the Hydra-matic 6T35 6-speed automatic transmission (RPO MNU). The new 6T35 transmission features Gen 3 upgrades implemented to enhance efficiency. The binary vane-type pump, for example, has been moved off-axis, which allows better sealing of the torque converter, reducing pump flow demands to enhance fuel economy.


The M32 manual transmission uses a premium three-shaft design with synchronizers for all gears, including Reverse. First and second gears feature triple-cone synchronizers and double-cone synchronizers are used on third and fourth gears.


Every Cruze comes equipped with four-wheel disc antilock brakes as well as Duralife rotors that enhance corrosion resistance. Rack-mounted electric power steering is standard on all models.


New Technology


The new Cruze features available keyless access and pushbutton start. (Fig. 3) With the Remote Keyless Entry transmitter (key fob) within 3 feet (0.9 m) of the door or the trunk, press the button on the door handle to open the door or press the touchpad to open the trunk.


The key fob must be in vehicle to start the engine. With the transmission in Park or Neutral, press the brake pedal (and clutch pedal, if equipped) and then press the ENGINE START/STOP button. The button indicator will be green when the engine starts. The button indicator will be amber when in accessory mode.


F03 Cruze 2016 interior

Fig. 3


To keep passengers entertained and connected, the Cruze features an intuitive next-generation MyLink infotainment system replete with a 7-inch diagonal color touch display, Apple CarPlay and Android Auto compatibility, and available 4G LTE Wi-Fi. (Fig. 4) Wireless charging also is available. The charging pocket is located on the center console. The phone should be placed in the pocket with the screen facing the rear of the vehicle.


F04 Cruze infotainment 4409170

Fig. 4


“Tech savvy” also applies to the sedan’s many safety features, such as available Side Blind Zone Alert with Lane Change Alert, Lane Keep Assist with Lane Departure Warning, and Forward Collision Alert, which utilize advanced radar and camera-based technologies to help drivers avoid a crash.


Vehicle Lifting


When servicing the Cruze’s underbody, the use of a Low Profile Lift Arms System may be required to avoid unwanted contact with the vehicle’s body and structure depending on the lift equipment used. (Fig. 5)


Front Lift Pads: When lifting the vehicle with a frame-contact lift, place the front lift pads on the underbody front side rail outrigger.


Rear Lift Pads: Place the rear pads on the rocker outer panel weld flange.


F05 Cruze lift points 4412801

Fig. 5


If raising the vehicle from the front or rear with a service jack, use the same frame contact locations as for the front and rear lift pads.


For additional information about the new 2016 Cruze, refer to Bulletin #16-NA-053.


– Thanks to Bill Taylor and Sherman Dixon


Updated May 5, 2016

Techline System Analyzer Provides Key Information

A new software program recently released will assist technicians in gathering important PC information to give to the Techline Customer Support Center (TCSC) when calling in for assistance.


The Techline System Analyzer can be installed on technicians’ computers to help determine general system specifications. Information gathered includes the version of the operating system and Internet Explorer the PC currently has; the amount of free hard drive space, the type and speed of the RAM processor, the video resolution, and any anti-virus and anti-spyware software that exists. (Fig. 6) This information will be used by TCSC to help in providing technical assistance with any PC or software concerns.


The Techline System Analyzer also can help identify if there are possible programs on the PC that may cause issues with service software, such as firewalls or anti-virus software.


F06 tsa report

Fig. 6


Download and Install


To download the Techline System Analyzer, go to the TIS2Web site on GM GlobalConnect, click the Utility tab and click the Techline System Analyzer “Install” button. Follow the installation prompts.


Once downloaded, a Techline System Analyzer icon will appear on the PC desktop. (Fig. 7) This provides a shortcut to run the program.


F07 icon

Fig. 7


– Thanks to Chris Henley

OnStar Advanced Diagnostics Update

For 2016, OnStar is expanding vehicle availability of its Advanced Diagnostics and Proactive Alerts services.


Diagnostic Alerts


Diagnostic Alerts help keep customers (who are enrolled in the service) informed of key vehicle systems, such as the engine, transmission and ABS, with a status report available in real-time by email or text. The service is available on most 2015 and 2016 GM models.


The alerts are generated by an onboard diagnostic/sensing system that can be analyzed using the appropriate Service Information.


Diagnostic Alerts include:

• Real-time maintenance and diagnostics that supplement a customer’s monthly Diagnostics Report

• Alert types that may cover oil life, flat tire, bulb outages, odometer-based maintenance, diesel exhaust fluid (if equipped), Diagnostic Trouble Codes (DTC) and critically low battery charge.

• Various methods of notifying customers, including email, text message and Dealer Maintenance Notification (DMN) —based on a customer’s preference when enrolling in the Advanced Diagnostics service.


Any DTCs that would have trigged an alert would also have been accompanied by the illumination of a Malfunction Indicator Lamp on the instrument cluster, with the exception of an exterior bulb outage.


New Diagnostic Alerts


There are three new Diagnostic Alerts — Low Oil Maintenance (if less than or equal to 5%), Diesel Exhaust Fluid (75 miles or 120 km until empty) and Bulb Outage (1 per filament bulb outage). These alerts are sent to customers in their monthly Diagnostics Reports (Fig. 8) and are also sent to dealerships as part of their DMN leads.


F08 report sample

Fig. 8


DTCs Set during Service


With Diagnostic Alerts notifying customers of DTCs, they may receive alerts from their vehicle when it is being serviced if a DTC is set during repairs. Disconnecting components or electrical connectors as required during some service procedures may set a DTC. Customers should be advised to disregard real-time alerts that are sent while their vehicle is being serviced.


Proactive Alerts


Proactive Alerts give customers peace of mind knowing that their vehicle’s key starting and fuel system components will not degrade without their knowledge, with notifications provided before a problem occurs. The alerts are designed to help predict specific types of issues based on information collected from the vehicle. (Not all issues will produce alerts.)


Currently offered on V6-equipped 2015-2016 Equinox and Terrain models and the 2016 Corvette, Proactive Alerts will soon become available on 2016 Silverado, Suburban, Tahoe, Sierra, Yukon models and Escalade models.


TIP: Customers must at least have the OnStar Basic Plan to enroll in the service.


Proactive Alerts monitor the performance of the:

• Engine cranking system (battery and starter motor performance)

• Fuel delivery system (in-tank fuel pump module and fuel pressure sensor performance)


Notifications before a Failure


When a covered component is detected as having degraded performance, an alert is generated. This is designed to happen before customers experience an issue with the vehicle. Some Proactive Alert messages may be generated without customers noticing any symptoms.


Customers will be notified in real-time via email and/or text message. (Fig. 9) An in-vehicle audio alert over the infotainment system also may be provided.


F09 text

Fig. 9


Unlike Diagnostic Alerts, Proactive Alerts are not generated by the vehicle’s onboard diagnostics system. While the data is collected from that system, it is analyzed off-board.


Currently, no associated DTCs are stored on the vehicle. Diagnosis of these alerts are covered under Bulletin #PI1250 in the Service Information.


One of the covered components is the 12- volt starting battery. Because these alerts can be triggered before the vehicle exhibits symptoms, the Proactive Alert battery replace labor operation does not require the warranty code that’s generated by the EL-50313 (GR8). Consequently, it’s important that dealerships follow the bulletin and use the appropriate labor operations.


For more information on Proactive Alerts, including a list of dealership FAQs, refer to the Advanced Diagnostics course (GCF00.115-0D/OnStar-Advanced Diagnostics) available on the GM Center of Learning at


– Thanks to Len Tillard

2016 GM Globally Approved Refinish Materials Manual Now Available

The 2016 GM Globally Approved Refinish Materials Manual is now available in the Service Information.


Each year, GM evaluates and tests new paint systems and new or improved products. The paint systems that pass this annual testing process are published in GM Globally Approved Refinish Materials Manual.


The manual can be viewed by clicking the “Select and view a Unit Repair, Specialty Publication, or Transmission Technical Guide” link on the Service Information home page. On the Unit Repair Manual page, the 2016 GM Globally Approved Refinish Materials Manual is listed under the Performance Parts Manuals on the bottom-left of the page. (Fig. 10)


F10 manual

Fig. 10


TIP: This manual is available on the Genuine GM Parts website for access by sublet body shops.


GM was the first domestic car company to set a specification for aftermarket paint finishes. Dealerships are required to use only materials and methods that meet GM Standard GMW15406 when repairing, replacing, or refinishing vehicles. The products listed in the manual have been approved by GM following a thorough, standardized test process to meet the GMW15406M Specification.


The manual provides additional information on paint manufacturers that have met the GM standard as well as detailed information about approved refinish materials. (Fig. 11)


F11 paint Fig. 11

– Thanks to Robert Hiser

Using an Insulation Multimeter

Similar to typical 12V vehicle systems, loss of isolation on the high voltage system of the Volt, ELR and Spark EV can be as simple as a direct conductor-to-chassis short. However, unlike 12V systems, the potential within high voltage systems means that insulation breakdown is also a cause for loss of isolation. Insulation breakdown typically occurs only when high voltages and/or current is present.


An Insulation Multimeter (EL-50772) (Fig. 12) must be used to test the isolation capability of high voltage components and circuits. An insulation breakdown cannot be diagnosed with a typical digital multimeter (DMM) because high voltage is not used by the DMM when measuring resistance. An Insulation Multimeter uses its own built-in high voltage.


F12 meter 1

Fig. 12


TIP: Always perform the high voltage disable procedure as published in the appropriate GM Service Information before servicing high voltage components and wiring and always wear the proper personal protective equipment.


Diagnosis with an Insulation Multimeter


The EL-50772 Insulation Multimeter tests the isolation capability of high voltage components and circuits. For correct test results, the functions of the Insulation Multimeter must be used properly.


Plug into the correct ports – It is critical that the correct ports (1, 2) are used for insulation testing. This is easy to get wrong, especially if the EL-50772 is used for standard DMM testing too. Do not use ports 3 and 4 for insulation testing. (Fig. 13) Also, if port 1 and port 4 are mistakenly used, continuity testing will still function, but the insulation test will always appear to pass.


F13 meter 2

Fig. 13


Always test at the 500V range – With the test leads not connected to anything, press and hold the insulation test button to know how your meter displays an infinite measurement. The EL-50772 will display 550M Ω when measuring an open circuit while set to the 500V range


See how your meter displays continuity – With the test leads connected together, press and hold the insulation test button. The EL-50772 will display 0.0 Ω.


A good ground reference is needed – When possible, use an alligator clamp to attach the ground lead. Typically, the reference point will be to the vehicle chassis, except cable testing, which requires connection to the cable shield termination at the connector and not to the chassis.


Verify the ground connection – Prior to every test measurement, verify the ground connection at a suitable ground location near the test point. The EL-50772 should display 0.0 Ω, indicating continuity.


Large capacitance or inductance testing – When testing components with large capacitance or inductance, such as certain modules and larger motor stators, it may be necessary to hold the insulation test button for a few seconds until the maximum resistance value is displayed.


More Information


For more information about loss of isolation testing, U.S. dealerships can check out the March 2015 edition of the Emerging Issues seminar (10215.03D). It includes a video demonstration using an Insulation Multimeter.


Also refer to the recent TechLink article Loss of Isolation Testing on High Voltage Systems


The EL-50772 Insulation Multimeter (Fluke 1587) is available through GM Dealer Equipment. Equivalent tools also are available from other sources.


– Thanks to Keith Newbury and Paul Radzwilowicz


Updated March 10, 2017

Ignition Switch Return

Service inventory of ignition switch part number D1426D (15242754) with a package date code of 15350 and prior should be returned. For replacement, order the same part number.

This part is used on 2003-2007 Hummer H2, 2003-2007 Express and Savana, 2002-2009 TrailBlazer, Envoy, 2002-2004 Bravada, 2002-2007 Rendezvous, 2003-2007 SSR, 2005-2009 Rainier, 2001-2005 Aztek, and 2003-2007 Silverado, Sierra, Tahoe, Suburban, Yukon and Escalade models.

The first two digits of the date code (15) represent the year 2015. The last three digits (350) are the Julian day of production. The Julian Date code is located in the upper-right corner of the label. (Fig. 14)


F14 switch code

Fig. 14


These parts with a package date code of 15350 and prior should not be installed on vehicles currently being repaired. Check the date code before installation of the ignition switch.


– Thanks to Charles Hensley

Air Filter Box Seal Leak

On some 2014-2016 Corvette, Silverado, Sierra; 2015-2016 Escalade models, Yukon models; and 2016 CTS and Camaro equipped with a V8 engine (RPOs LT1, LT4, L83, L86, LV1, LV3), the MIL may be illuminated and DTCs P0420 (Catalyst System Low Efficiency) and P0430 (Catalyst System Low Efficiency Bank 2) may be set. These conditions may be caused by excessive dirt/debris entering the air filter box and bypassing the seal of the air filter, causing damage to the H02 sensor element (Fig. 15) and blocking the catalytic converter. (Fig. 16)


F15 air filter 01

Fig. 15

F16 air filter 00

Fig. 16


Do not replace any parts for these conditions until the air filter housing has been validated to be completely sealed.


Inspect the air housing cover for any missing tabs or fasteners. Also remove the air filter housing cover and inspect the seal around the filter as well as the air filter sealing surface for signs of not contacting the air filter seal. (Fig. 17)


F17 air filter 1Fig. 17


In addition, look for dirt/debris in the air filter housing cover bypassing the air filter. (Fig. 18)


If dirt/debris is bypassing the air filter due to a faulty seal, replace the air filter. If the air filter housing is not properly sealing, refer to the appropriate Service Information for additional diagnostic procedures.


F18 air filter 2

Fig. 18


– Thanks to Tracy Lucas

Intermittent Radio Conditions

Several intermittent radio conditions — a static noise from the radio speakers, Android Auto connection issues and Sirius XM reverting to channel XM1 — may occur on some 2016 Camaro, Cruze, Malibu, Spark, Silverado and Sierra models equipped with Chevrolet MyLink or GMC IntelliLink radios (RPO IOA, IOB). (Fig. 17)


F19 mylink radio

Fig. 19


If these conditions are found, a new radio calibration is available in TIS2Web: New Software to Address Audio Buzzing and Static Issues. USB and SPS programming of the radio is required.


TIP: If programming a Spark, select GM Korea within TIS2Web to select the vehicle.


– Thanks to Jamie Parkhurst

Service Know-How

10216.04D – Emerging Issues

April 14, 2016


To view Emerging Issues seminars:

• Log in to

• Select Resources > Service Know-How/TECHAssist > Emerging Issues > Searchable Streaming Video; or

• Select Catalog to search for the course number, and then select View > Take or Continue Course

Steering Gear Preload Adjustment

The steering may feel loose or have excessive play on some 2016 Silverado 2500/3500 and Sierra 2500/2500 models equipped with Digital Steering Assist (RPO NV8). This condition may be caused by an incorrect Pitman Shaft Over-Center Preload Adjustment. Do not replace the steering gear.


There is a new Steering Gear Pitman Over-Center Preload Adjustment procedure. Refer to #PIT5501 for additional details. Here are some highlights.


The procedure involves centering the steering gear input shaft. By extending the steering gear pitman shaft lash adjuster screw (Fig. 17, #1), the steering gear input shaft (Fig. 17, #2) can be rotated stop-to-stop. Count the number of turns. Starting at either stop, turn the steering gear input shaft back half the total number of turns to center the shaft. The flat on the steering gear input shaft faces upward and is parallel with the steering gear side cover when the shaft is centered.


F17 gear 1

Fig. 17


Next, rotate the steering gear input shaft 300 degrees from each side of the center of the input shaft using a torque wrench. (Fig. 18) It must rotate smoothly and not stick or bind. Record the average turning torque. This is the off-center friction torque, which must be 0.4 to 1.1 Nm (4 to 10 in.-lbs.). If the torque is out of this range, replace the steering gear assembly.


F18 gear 2

Fig. 18


To adjust the over-center preload torque, center the steering gear input shaft again. Using a torque wrench on the input shaft with the handle in the vertical position, rotate the shaft 45 degrees from each side of center. (Fig. 19) Adjust the lash adjuster screw until the over-center preload torque is 0.65 to 1.1 Nm (6 to 10 in.-lbs.) above the off-center friction torque recorded earlier.


F19 gear 3

Fig. 19


For example, if the recorded value was 0.8 Nm (7 in.-lbs.), then adjust the lash adjuster screw until the over-center preload torque is between 1.45 to 1.9 Nm (13 to 17 in.-lbs.).


Tighten the steering gear pitman shaft lash adjuster nut. Prevent the steering gear pitman shaft lash adjuster screw from turning while tightening the nut.


– Thanks to Jim Will



Find Your Way: Navigation Map Update

A new map update is now available for navigation systems (RPO UGY or UGX) on 2013-2014 Enclave, Traverse and Acadia. The update is performed using a VIN-specific encrypted USB stick.


This is a customer-purchased map update. Refer to #PI1516 for VIN-specific USB stick pricing and ordering information.


Before installing the update, confirm the current map version by scrolling down to Data Software under Navigation Settings. The current version should be Part Number 23129307 and the Revision version is 2012Q1. If the Revision version number is 2013Q2, the update has already been installed.


The update takes approximately 90 minutes to complete. Install the EL-49642 SPS Programming Support Tool to maintain system voltage.


Update the Map


To install the map update, insert the VIN-specific USB stick and select Update on the Product Update Detected screen. (Fig. 14) If a selection is not made in time, the screen will time out. If this occurs, remove the USB drive and reinsert it.


F14 update 1

Fig 14


Once the Update screen button is selected and the update begins, keep the vehicle in Park and do not remove the USB stick. During the update process, the system will transition through several stages. No manual prompts are necessary. (Fig. 15)


F15 update 2

Fig. 15


When the update is completed, the navigation system will restart. (Fig. 16) To confirm that the installation was successful, revisit Data Software under Navigation Settings and check that the Revision version has changed to 2013Q2.


F16 update 3

Fig. 16

After the map update installation, favorites such as POIs, destinations and radio station presets will reset to the factory default.


TIP: Dispose of the USB stick as it shouldn’t be used again. If the USB stick is reinstalled and the update is selected, the process will begin again and cannot be interrupted.


– Thanks to Dan Hrodey

Illuminated Front Grille Bowtie Accessory Installation

When installing the Illuminated Front Grille Bowtie (part number 23380121) (Fig. 10) as part of the Body Emblem Package accessory kit (part number 23461744) on the 2016 Camaro, be sure the jumper harness is plugged into the correct connector. If the incorrect connector is used, the bowtie will not illuminate.


F10 bowtie image

Fig. 10


Following the installation instructions, use the harness that is provided in the kit and plug it into the right-hand (RH) Daytime Running Lamps (DRL) connector. (Fig. 11) Disconnect the front fascia harness connector from the RH DRL lamp and connect it into the mating end of the jumper harness connector. Connect the other end of the jumper harness connector into the RH DRL lamp. (Fig. 12)


F11 bowtie DRL

Fig. 11

F12 correct 2

Fig. 12


If the accessory harness is plugged into the side marker light (Fig. 13), which uses the same style connector, instead of the DRL connector, the bowtie will not illuminate.


F13 incorrect

Fig. 13

– Thanks to Matt Singer

Wireless Charging Testing on the 2016 Volt

Inductive charging, or wireless charging, uses a magnetic field to transfer energy between two objects. For mobile device charging on the 2016 Volt, the wireless charger pocket in the center console storage compartment has an induction coil to create an alternating magnetic field. A second induction coil in the compatible mobile device takes power from the magnetic field and converts it back into electric current to charge the battery. The two induction coils in proximity work similarly to an electrical transformer. When a wireless charging device is placed in the charging pocket (Fig. 8), the charging of the device battery will start.


F08 test tool charging pocket

Fig. 8


The  Mobile Device Wireless Charger Module is controlled by an ignition operated relay and is operational when the ignition is in the Accessory or On position. The  Body Control Module detects the device battery is charging and sends a serial data message to the  Info Display Module to illuminate the charge indicator.


Before testing the wireless charger, verify the following:

  • The mobile device can be charged with the proper wireless charging adapter
  • The charging pocket is free from any foreign objects that may impede charging
  • The mobile device is positioned correctly in the charging pocket with the device screen facing the rear of the vehicle


Inductive Charging Test Tool


The EL-51755 Inductive Charging Test Tool can be used to verify system operation. When using the test tool on the 2016 Volt, do not insert the tool to the very bottom of the charging pocket. The test tool will perform correctly if the edge of the tool (where the lanyard is attached) is positioned approximately 1/4-inch below the lip of the rubber sleeve surrounding the pocket. The supplied lanyard can be used to suspend the tool at this position. (Fig. 9) Slowly lower the tool, keeping it centered against the front wall.


F09 test tool positioning

Fig. 9

The test tool should be reasonably centered in the pocket to align with the vehicle sensor and it should rest against the pocket wall. There is no need to remove the rubber sleeve from the pocket for testing.


With the test tool turned on and properly positioned, the operation of the charging system can be verified. If the tool’s wireless charging indicator is on, the system is operating properly and the charging concern may be caused by an incompatible or defective mobile device. If the charging indicator is off, continue diagnosis using the appropriate Service Information.


To complete the test successfully, the procedure may need to be repeated five times. Between each attempt, remove the tool and wait 2 seconds.


– Thanks to Bob Sredzinski


Updated May 5, 2016

TechLink Survey Results

The recent TechLink reader survey asked technicians and other dealership personnel to provide their input about a wide range of topics on TechLink, from the latest diagnostic information to Techline programming and special tools coverage.


The purpose of the survey was to collect feedback on technician satisfaction and to gain a better understanding about the features of TechLink that you find useful. The survey asked readers to rate their satisfaction regarding the coverage of service news, new model features, technical information, bulletin repairs, and programming.


Here are the results of the reader survey.


A majority of readers rated the coverage of service news and repair information as excellent (50 percent) or good (45 percent). Our continuing goal at TechLink is to always provide the very latest GM service news affecting dealership technicians.


The coverage of features and repairs on new models was rated excellent (49 percent) or good (45 percent).


Readers also rated their satisfaction as excellent (46 percent) or good (45 percent) with the coverage of technical information about how systems/components work.


The coverage of specific repairs from Bulletins and Preliminary Information was rated as excellent (48 percent) or good (44 percent).


The coverage of programming and other Techline information was rated as excellent (40 percent) or good (49 percent) by a majority of readers.


Regarding the suggestions for which topics should be covered more in TechLink, new model information (29 percent) received the most votes. It was followed by programming (23 percent) and basic repair information (24 percent). A smaller percentage of readers requested more special tool coverage (15 percent).


The technical subjects that readers would like to see more coverage on included electronics/electrical repairs (35 percent), infotainment and connectivity (28 percent), powertrain (21 percent) and brakes, suspension and steering, including new safety features, (12 percent). Look for more on these topics in the future.


Two new features on the website are the Resources and Essential Tools sections. 45 percent of readers said they use these features. However, 39 percent said they didn’t know there were Resources and Essential Tools sections. These sections are at the bottom of the home page and include useful information on topics such as terminal and wiring repairs and recently released special tools.


Overall, 94 percent of readers rated their satisfaction with the coverage and information found on TechLink as excellent or good. But our goal is one of continuous improvement. So we’re working to make TechLink better, with more timely news and in-depth information.


If you have any suggestions for us, click the What Would You Like to See? link on the right side of the TechLink home page. Thanks for your input.


– Thanks to Lisa Scott

Complimentary Transport for CT6 Aluminum Repairs

The 2016 Cadillac CT6 features an aluminum-intensive body structure. The all-new architecture has a mixed-material structure with all-aluminum exterior body panels and 13 high-pressure aluminum die castings in the lower body construction. (Fig. 7) The result is a vehicle that is approximately 218 lbs. (99 kg) lighter than a comparable vehicle using predominantly high-strength steel.


F07 aluminum structure

Fig. 7


Any structural repairs on the CT6 should be performed at a Cadillac Aluminum Repair Network (CARN) center. These are approved facilities that offer specially trained personnel along with the proper equipment and tools to best restore the unit to pre-collision condition.


To deliver these vehicles to a CARN center, there is a new a complimentary transport program for U.S. dealerships. GM offers an administrative allowance to dealerships that inspect a vehicle and use the Cadillac Collision Transport Center to arrange transport on a customer’s behalf.


CT6 customers who have been in an accident should first contact Cadillac Roadside Assistance and have their vehicle towed to their local Cadillac dealership.


If the vehicle requires aluminum structural repair, dealerships must contact the Cadillac Collision Transport Center at 1-877-798-2989 to arrange transport of the vehicle to the nearest CARN facility. This number is for dealerships only.


When making the call, dealership personnel should be prepared to provide the following:


  • BAC
  • Dealership name and contact person
  • VIN
  • Customer name and contact information
  • Location and condition of the vehicle


There is no charge to customers within the first four years/50,000 miles of ownership, whichever comes first. Dealership-owned inventory units are not eligible for complimentary transport.


– Thanks to Robert Thiede

New Techline Data Service FAQs

The new Techline Data Service (TDS) application being rolled out now to GM dealerships is designed to help manage large calibration files more efficiently. It eliminates the need for each dealership computer to download the large files and exhaust Internet bandwidth. TDS also eliminates the need to install the files from DVDs. The distribution of the TDS software began with all GM dealerships in Michigan. Additional states will be activated, in alphabetical order, in a staggered rollout.


With TDS installed and configured, one computer in the dealership can be dedicated to downloading the files, while other computers can access that data from the one dedicated computer via the dealership’s network. The download speeds and times for the calibration files are adjustable and can take place throughout the day and/or night.


TDS is being rolled out now in a staged process to cover all dealerships. Here are some common questions.




What does a dealership need to use TDS?


A dedicated PC that meets GM specifications (Windows 7 Professional operating system, at least 1 TB of free hard-drive space and 4 GB of RAM, and Sleep Mode disabled in power management), is hard-wired to the network (wireless is not recommended) and can remain on at all times.


How do you know TDS is deployed at the dealership?


Once TDS has been deployed at your dealership, an administrative message will be sent stating that it’s ready to load. In Canada, dealerships will receive a GlobalConnect message. Also, a new TDS tab in TIS2Web will appear for launching the installer.


Are there TDS installation instructions?


Installation instructions are included with the activation. Make sure to launch the installer only on the PC that will be used as the TDS storage machine. (Refer to TIS2Web for complete instructions.)


Are all dealerships required to participate?


Technically, no. Use of TDS is optional, but the time saved by using the application is significant.


Will our dealership continue to receive the Techline Cache DVDs?  Should we save the discs after TDS is set up?


Once the TDS rollout is completed, Techline Cache discs will be discontinued. TDS takes the place of the discs. There will be no need to save the discs; you may recycle them accordingly.


If we don’t have a PC to load TDS, is there a recommendation to follow?


Check the GM Dealership PC Infrastructure Guidelines if purchasing a new computer. A desktop unit is recommended since it will be dedicated and left on to receive the calibration files. To purchase a TDS-certified computer, visit (Fig. 6) In Canada, refer to the GM Techline IT Guidelines on GlobalConnect within the Reference Libraries under the Service department.


F06 computer

Fig. 6


Can a server be used instead of a desktop PC?


No, the computer must fall within the dealership guidelines to receive support from the Techline Customer Support Center (TCSC). Servers do not qualify.


Can TDS be loaded on a PC that’s used with other Techline applications? 


Although possible, it’s not recommended. The application will need to stay powered on to receive calibration files continuously.


What happens to the dealership’s programming capability if the TDS PC becomes inoperable?


Calibrations can still be downloaded via the Internet through TIS2Web at the time of the programming event. This could significantly increase programming time and may increase the probability of download failure due to local network conditions.


– Thanks to Chris Henley

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