Archive for June 2016

Luxurious New CT6 is Cadillac’s Range-Topping Sedan

The all-new CT6 leads Cadillac’s nomenclature change at the top of the Cadillac line-up. (Fig. 1) Riding on the rear-wheel-drive Omega architecture, the new sedan is built using GM’s most advanced manufacturing methods and has many features that are first-time offerings on any GM model.


2016 Cadillac CT6, Los Angeles, CA

Fig. 1




The CT6 has three available engines. The base engine is a turbocharged 2.0L 4-cylinder engine (RPO LTG) that generates 265 horsepower and 295 lb.-ft. of torque.


The all-new twin-turbocharged 3.0L V6 engine (RPO LGW), producing 404 horsepower and 400 lb.-ft. of torque, features Active Fuel Management (AFM). (Fig. 2) The engine features turbochargers with lightweight, low-inertia titanium-aluminide turbine wheels and an efficient, patented low-volume charge-air cooler.


The all-new 3.6L V6 engine (RPO LGX) is a clean-sheet engine redesign of the DOHC V6 engine family and offers 335 horsepower and 284 lf.-ft. of torque. It incorporates Active Fuel Management (AFM) and Auto Stop/Start technology along with direct injection and continuously variable valve timing.


F02 CT6 30 engine

Fig. 2


The fuel-saving engine Auto Stop/Start system is integrated on all three engines. It turns off the engine under certain driving conditions when the brake pedal is applied and the vehicle is at a complete stop. An upgraded starter motor and advanced battery technology support the increased number of engine starts. The starter motor has a high performance electric motor and stronger pinion engagement mechanism. An intelligent battery sensor module monitors the state of charge and health of the battery, which are used by the ECM to determine if the Stop/Start function may be performed.


Two transmissions are available. The Hydra-matic 8L45 8-speed automatic transmission (RPO M5N) is mated with the 2.0L turbo engine and the 3.6L V6 engine. The Hydra-matic 8L90 8-speed automatic transmission (RPO M5X), which is designed and tuned for higher power outputs, is matched with the 3.0L twin turbocharged V6 engine.


Body Structure


The CT6 features one of the industry’s most advanced automotive body structures with an aluminum-intensive architecture (Fig. 3) that incorporates 11 different materials.


For the CT6, engineers developed new body construction techniques and technologies to allow various types of advanced and lightweight materials to be combined within the manufacturing environment, including proprietary aluminum spot welding technology that is more efficient and helps reduce weight. Laser welding, flow drill fasteners and advanced structural adhesives are also employed. Thirteen high-pressure aluminum die castings in the lower body construction reduce complexity and are significant contributors to the architecture’s low mass. The CT6 also has all aluminum exterior body panels.


F03 CT6 aluminum content

Fig. 3


TIP: In the event of a collision, CT6 vehicles requiring structural repairs should be sent to a Cadillac Aluminum Repair Network (CARN) facility. These approved facilities have the training, equipment and tools necessary to properly perform structural repairs. In the U.S., 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. In Canada, dealerships should refer the vehicle to one of the Cadillac-certified aluminum repair facilities in Canada.


The CT6 comes equipped with a high arm multi-link short/long arm suspension. The control arms are made from forged aluminum to reduce weight. The multi-link suspension replaces the lower control arms with two lower links.


The 5-link rear suspension uses forged aluminum control links to increase strength and reduce weight. The long suspension links minimize caster and camber change.


Interior Features


Inside the CT6, extended comfort seats feature premium Opus leather, five massage programs, reclining rear seats and Cadillac’s first application of woven-in-seat heating elements.


An articulating rear seat package offers approximately 3.3 inches (83 mm) of adjustable seat travel, lumbar adjustment, tilting cushions, a massage feature, heating/cooling features and an armrest with media controls.


The Bose® Panaray® audio system (Fig. 4), which is the first to use Bose VideoWave®, Articulated Array® and line array speakers in an automotive environment, has 34 speakers strategically integrated in the vehicle cabin, of which 33 are 3.94 inches (100 mm) or less in size. The VideoWave speakers are integrated into the floor.


2016 Cadillac CT6, Los Angeles, CA

Fig. 4


The CT6 is equipped with a large 10.2-inch (259 mm) diagonal Cadillac CUE interface screen. The capacitive-touch screen reacts faster when scrolling and recognizes handwriting for address and points of interest searches. The touchpad allows control of CUE features while resting an arm on the center console rather than touching the screen. (Fig. 5)


2016 Cadillac CT6, Los Angeles, CA

Fig. 5


Safety Features


There are many new safety and technology features available on the CT6. The Backing Warning and Rear Automatic Braking system on vehicles equipped with Adaptive Cruise Control can warn of rear objects when backing up at speeds greater than 5 mph (8 km/h). When the system detects a potential collision, beeps will be heard from the rear, or five pulses will be felt on both sides of the Safety Alert Seat. There may also be a brief, sharp application of the brakes.


The Night Vision system can help the driver see and be alerted to pedestrians or large animals ahead of the vehicle beyond the area lit by the headlamps. A thermal heat image of the view ahead is displayed when it is dark enough outside. (Fig. 6) If a pedestrian or large animal is detected more than 82 ft. (25 m) away, an amber pedestrian or animal icon displays and a box appears around the pedestrian or animal on the instrument cluster. When the system detects that the vehicle is approaching a pedestrian ahead much too quickly, the amber box changes to red. With the Front Pedestrian Braking system turned on, Night Vision provides a red Head-Up Display (HUD) alert when the system detects that the vehicle is approaching a pedestrian ahead much too quickly.


2016 Cadillac CT6, Los Angeles, CA

Fig. 6


Also available on the CT6 is Cadillac’s patented new industry-leading Rear Camera Mirror system, which enhances the driver’s rear vision by an estimated 300 percent compared to a conventional inside rearview mirror. A high-dynamic range camera records wider images behind the car, streams the image to video processing software that removes obstacles — such as the roof, rear pillars and rear seat passengers — and projects an unobstructed view to the in-mirror display. (Fig. 7) The display is a 1280 by 240-pixel TFT-Liquid Crystal Display (LCD) with 171-pixels per inch.


Drivers can disable the mirror’s video streaming function and use the traditional electrochromic rearview mirror by flipping the toggle on the underside of the mirror.


2016 Cadillac CT6, Los Angeles, CA

Fig. 7


Automatic Vehicle Hold (AVH), when activated, can prevent the vehicle from moving when stopped. It can be turned on by pressing the AVH button with the driver’s safety belt fastened, the driver’s door closed, and the engine running. After the brake pedal has been released and before the accelerator pedal has been pressed, AVH uses braking pressure to hold the vehicle stationary. In addition, the ABS pump motor may activate to build brake pressure to maintain the vehicle at a standstill if necessary. If AVH is holding the vehicle, the AVH indicator will change to green. While AVH is holding the vehicle, the parking brake will engage if the driver’s door is opened or the driver’s safety belt is unfastened.


Special Tools


The following new tools were released for the CT6:

Screen Shot 2016-07-27 at 4.52.08 PM


For additional information on the all-new Cadillac CT6, refer to Bulletin #16-NA-112.


– Thanks to Sherman Dixon and Blake Streling

CT6 Active Chassis System

The advanced performance chassis system of the Cadillac CT6 is designed to deliver an engaging driving experience — delivering segment-best ride, handling and isolation qualities — with active on-demand all-wheel drive, active rear steering and Magnetic Ride Control on the available Active Chassis System. (Fig. 9)


F09 CT6 active chassis image

Fig. 9


Active Rear Steering


Active Rear Steering (ARS), standard on the Platinum edition and offered as an option on the Luxury and Premium models, improves low-speed maneuverability and increases agility at higher speeds. At low speeds (below 22.3 mph or 36 km/h), the rear wheels turn in the opposite direction of the front wheels in both forward and reverse gears. The system allows the rear wheels to turn in unison with the front wheels at higher speeds (above 22.3 mph or 36 km/h), which helps the vehicle change direction much better. The result is a full-size car that handles like a mid-size sports sedan.


Active Rear Steering Smart Actuator


The ARS system consists of a smart actuator (Fig. 10, #2) that contains the control module and motor and the linkage that transmits the force from the actuator to the rear steering knuckle and wheels. The ARS system is controlled by the Electronic Brake Control Module (EBCM), which uses inputs including vehicle speed, steering wheel angle sensor, and steering wheel angle rate of change to determine the correct rear wheel steering angle.


F10 CT6 actuator

Fig. 10


The EBCM uses the Chassis GMLAN bus to command the Rear Wheel Steering Control Module (RWSCM) to turn the rear wheels. The RWSCM provides feedback to the EBCM for the steering position and rate of change. The ARS system can mechanically move 4.6 degrees but the controller limits movement to 3.5 degrees.


Active On-Demand AWD


Active-on-demand all-wheel drive (AWD) – standard on all CT6 V6 models — is also part of the Active Chassis System, making the most of handling and stability in all weather conditions. The AWD configuration adds an active transfer case after the transmission that splits the power between the one-piece front propeller shaft and the two-piece rear propeller shaft.


The AWD system features a Magna model MP 3713G one-speed transfer case. Software calibrations tune an on-demand torque biasing friction clutch. When a driver enters a turn, clutch torque decreases based on the various GM LAN inputs, such as steering angle and vehicle speed, to prevent crow-hopping or driveline binding from occurring at low speeds.


The torque split between the front and rear axle is not fixed, which differs from an open center differential transfer case. The active design can transfer 0 to 100 percent of the torque to the front axle. The torque transfer is adjusted based on multiple inputs, including wheel slip, engine speed, throttle position, transmission gear and the selectable driving modes of Tour, Snow/Ice or Sport mode.


Torque is moved to the front axle through an active wet clutch within the transfer case. (Fig. 11) The actuator motor turns a worm gear that rotates the shift shaft, which actuates a scissor mechanism and applies the clutch.


F11 CT6 transfer case

Fig. 11


The selectable driving modes use magneto-rheological technology to independently control each of the shock absorbers and struts and change the characteristics of the suspension system. Magneto-rheological technology independently controls the fluid viscosity in each strut and shock absorber. Front struts and rear shock absorbers contain an internal electrical coil and micron-sized metal particles in the magneto-rheological fluid. The suspension control module uses pulse width modulated (PWM) current to the electric coil within each strut or shock. The PWM current increases the fluid viscosity by aligning the metal particles within it, which increases or decreases the suspension damping force during both compression and rebound.


In all types of weather and road conditions, the system allows drivers to tailor the system to deliver a customized ride and precise handling.


– Thanks to Sherman Dixon and Blake Streling

Windows 10 Pro Now Supported for Techline Applications

GM Customer Care and Aftersales recently announced it will support Windows 10 Professional (64 bit) for use with the Techline applications, including TIS2Web, GDS 2, MDI Manager, Service Information, and others. This support of Windows 10 Pro for Techline applications is in response to the numerous technician inquiries that have been received regarding the use of Windows 10 in dealership service departments.


Internet Explorer (IE) 11 (32 bit) will continue to be the recommended internet browser. The new Microsoft Edge browser does not support the plugins needed for use with the TIS2Web and Service Information applications.


Updated GM Dealership Infrastructure Guidelines will be available soon outlining the latest technology specifications recommended for dealership service operations.


Additional information also will be released when all dealership applications are ready for use with Windows 10 Pro.


For information about PC hardware that meets Techline requirements, visit (Fig. 12)


F12 laptop page

Fig. 12


– Thanks to Lisa Scott



Steering Wheel Airbag Removal

The steering wheel airbag on 2016-2017 Malibu and Volt models is secured using spring fasteners. These fasteners can be accessed from access holes behind the steering wheel on both sides of the wheel.


The removal procedure for the airbag has been updated. Here is the new procedure.


1.     Disconnect the battery and wait 20 seconds before beginning the removal procedure.

2.     Locate the two access holes on the back of each side of the steering wheel, located at approximately 5 o’clock and 7 o’clock. (Fig. 13: A. Airbag, B. Access holes)


F13 airbag image 1

Fig. 13


3.     Insert two 3mm or 1/8-inch Allen wrenches into each access hole. (Fig. 14) A screw driver is too large and will not clear the metal guides inside the access holes.


F14 airbag image 2

Fig 14

4.     Slide the Allen wrenches through the metal guides (shown in green) inside the access holes until they bottom out against the retaining fasteners. (Fig. 15) The guides will properly position the wrenches against the fasteners. Do not wiggle or force the wrenches.


F15 airbag image 3

Fig. 15


5.     Once the wrenches contact the retaining fasteners (Fig. 16), apply pressure straight inward simultaneously to push the spring fasteners inward and disengage the airbag from the steering wheel. This will release all three airbag attachments.


F16 airbag image 4

Fig. 16


6.     Carefully rotate the top of the airbag down until it is horizontal to the steering wheel. Release the Connector Position Assurance (CPA) retainer (Fig. 17, D) and disconnect the electrical connectors to remove the airbag.


F17 airbag image 5

Fig. 17


– Thanks to Dallas Walton and Chuck Wieseckel

Fuel Odor or Leak from Top of Fuel Tank

A fuel odor, fuel leak or fuel weeping may be noticed at the top of the fuel tank on some 2015-2016 Colorado and Canyon trucks. This condition may be caused by chemicals being carried in the truck bed.


Sulfuric acid, such as from leaking batteries, or other chemicals placed in the bed of the truck may leak or be washed through the holes in the pickup box and settle on the top of the fuel tank. As a result, chemical damage to the fuel pump module may be seen as a fractured port (Fig. 18) or cracks in the plastic flange. (Fig. 19)


F18 fuel pump 1a

Fig. 18


F19 fuel pump 1

Fig. 19

Vehicles with a spray-on bed liner also may exhibit the condition because the floor/front panel seam is not fully sealed.


Verify fuel pump damage or failure and replace the fuel pump module.


Before reinstalling the fuel tank to the vehicle, install a drain hole plug to the open left side drain hole location. (Fig. 20)


F20 fuel pump 2Fig. 20

After installation of the new fuel pump module, apply seam sealant to the top-side front joint of the pickup bed floor and front panel.


Clean any dirt, grease, or chemical residue from the repair area. Apply clear seam sealer to the bed floor or black sealer on a spray-on bed liner. Ensure the lower corners are fully sealed by applying sealant past the bottom radius and up to the front panel body line (Fig. 21) as well as across the complete front/floor panel joint. (Fig. 22)


F21 fuel pump 3

Fig. 21

F22 fuel pump 4

Fig. 22


Refer to Bulletin #16-NA-195 for additional details, including seam sealer parts information.


– Thanks to Charles Hensley



GM TechTube Videos Offer Quick, Concise Technical Information

The GM TechTube videos (Fig. 23) available on the GM Center of Learning provide technicians with quick and concise reviews of specific repair procedures, offering repair insights and just-in-time knowledge. Topics range from high pressure fuel pump replacement and transmission fluid level checking procedures to circuit load testing and AFIT setup and testing.

F23 techtube videos

Fig. 23


The short, informative videos, which run 10 minutes or less, can be accessed on laptops, tablets or smartphones. A number of new TechTube videos have been released recently, with more on the way.


To view the videos, click the GM TechTube link on the Center of Learning home page. A user account is required to log in to the Center of Learning website [link to] or through GM GlobalConnect.


The available videos are organized by the following technical categories:

·       Maintenance

·       Engine/Propulsions

·       Electrical/Electronics

·       Transmission

·       Auto Body and Paint

·       Body Systems

·       Driveline Axle

·       Brakes

·       Steering and Suspension

·       HVAC

·       Tech for Non-Tech

·       Tools and Equipment

·       Power and Signal Distribution


The TechTube videos also can be viewed by selecting Video on Demand under the Resources tab at the top of the home page. Select the GM TechTube channel to view a list of all available TechTube videos.


To search for a specific video, enter the course number or course name in the search box.


– Thanks to Ken Billings

Engineering Information Bulletins and Part Restrictions

Restrictions 07222016 1

Restrictions 07222016 2

Restrictions 07222016 3

Restrictions 07222016 4

Restrictions 07222016 5

All-New 2017 GMC Acadia

The all-new 2017 Acadia takes on the heart of the midsize crossover segment. It features seating for up to seven passengers with several different models, including the premium Acadia Denali. The new All Terrain model (Fig. 1) features enhanced off-road capability while providing seating for five and added cargo capability.


2017 All-New GMC Acadia All Terrain

Fig. 1




The new 2.5L 4-cylinder engine (RPO LCV) standard on the Acadia produces 194 horsepower and 190 lb.ft. of torque. It includes Auto Stop/Start technology to increase efficiency in stop-and-go driving. The engine is paired with the Hydra-Matic™ 6T50 6-speed automatic transmission.


The 2.5L engine features a high pressure direct injection fuel system, dual overhead camshafts with continuously variable valve timing, electronic throttle control, and pistons with jet-spray oil cooling. When equipped with this engine, the vehicle also has Active Grille Shutters.


The new available 3.6L V6 engine (RPO LGX) (Fig. 2) is more powerful and efficient than the current model. It generates 310 horsepower and 271 lb.-ft. of torque while offering an estimated 4,000 pounds (1,814 kg) of trailering capability with the available towing package. The 3.6L engine is mated to the Hydra-Matic™ 6T70 6-speed automatic transmission.


F02 3.6L engine

Fig. 2

The new engine design represents the latest version of GM’s DOHC V6 engine family and incorporates Active Fuel Management (AFM) along with direct injection (DI) and continuously variable valve timing (VVT).


The 2.5L engine uses dexos 5W-20 engine oil and the 3.6L engine uses dexos 5W-30 engine oil.


The advanced Active Twin Clutch All-Wheel-Drive (AWD) system on the Acadia All Terrain model electronically splits torque between the rear wheels when needed to provide additional control versus a 50/50 split in a single clutch system. It provides enhanced traction, stability and performance during vehicle acceleration and cornering as well as improved traction in wet or slippery conditions.


It also has a specific All Terrain mode in place of the Off-Road mode on the drive mode selector, which offers enhanced hill-climb capability and unique tuning.


Acadia models also feature a MacPherson strut front suspension with a five-link rear suspension, a rack mounted electric power steering system and, on SLT2 and Denali models, an electronically controlled continuous damping system.


Interior Features


The split folding second row seating improves on the original Smart Slide feature of the current model. (Fig. 3) It includes the capability of the curbside seat sliding and tilting forward even with a forward-facing child seat in place.


F03 2017 Acadia interior 7-pass seating

Fig. 3


The 50/50-split, two-passenger third row seat folds flat for a completely flat load floor behind the second row. Levers at the rear of the vehicle make it easier to fold the second and third row seats.


Safety Features


New active safety features that are available on Acadia include Lane Keep Assist, Front Park Assist, Front Pedestrian Braking, Forward Automatic Braking, Lane Change Alert, Safety Alert Seat, Surround Vision and IntelliBeam. These features are designed to help make drivers more aware of their surroundings and help avoid potential crash situations.


The available Active Tow system helps make hitching up easier by employing the Rear Vision Camera (RVC) with dynamic guidelines to help line up the Acadia’s hitch with the trailer. (Fig. 4) Using the screen buttons, it also offers a view of the trailer while driving above 5 mph. The view is exited automatically after eight seconds.


F04 2017 Acadia Active Tow

Fig. 4


New Technology


The Acadia offers a hands-free power liftgate on Denali models. To open or close the liftgate hands-free, kick your foot straight under the left (driver’s side) corner of the rear bumper. The Remote Keyless Entry transmitter must be within three feet of the liftgate.


The IntelliLink system in the Acadia offers support for Apple® CarPlay™ and Android™ Auto support as well as available OnStar 4G LTE with Wi-Fi. It’s available with a 7-inch or 8-inch diagonal touch screen. (Fig. 5)


F05 Acadia radio

Fig. 5


The Rear Seat Reminder feature on the Acadia provides a DIC message and warning chime when exiting the vehicle if the rear doors have been opened during the ignition cycle. The system does not actually detect objects in the rear seat, but detects when a rear door was opened and closed, indicating there may be something in the rear seat.


Special Tools


The following new tools were released for the 2017 Acadia:

Screen Shot 2016-07-01 at 10.31.10 AM



For additional information on the all-new 2017 Acadia, refer to Bulletin #16-NA-135.


– Thanks to Sherman Dixon and Tom Burlingame

Corvette Power Steering Gear Cooling Duct Installation

The 2014-2016 Corvette is designed to deliver outstanding performance on the track with minimal changes needed to get the car ready to meet the demands of track driving.


Driving the vehicle on the track during hot days may result in drivers feeling a reduction in steering assist. A Driver Information Center message of “Service Power Steering Gear” may appear and DTC C0176 (Control Module Temperature Sensor High) may be set. These conditions may be caused by an increase in temperature with the steering gear, which is typical during prolonged driving in a track environment.


A new power steering gear cooling duct can be installed to help cool the power steering gear. There are several modifications that must be made before installation. Refer to #PI1535A for complete details on cooling duct installation and part numbers.


The new front compartment air deflector must be cut as shown in the illustration (Fig. 6) to the following dimensions:

#1 – 25.4 mm (1 in.)

#2 – 19.05 mm (0.75 in.)

#3 –152.4 mm (6 in.)

#4 – 50.8 mm (2 in.)


F06 cooling duct image 1

Fig. 6


Remove the support arm (Fig. 7, #1) from the cooling duct and cut the duct 50.8 mm (2 in.) after the second bend. (Fig. 7, #2)


F07 cooling duct image 2

Fig. 7

Also cut the duct at 50. 8 mm (2 in.) up from the top of the hole. (Fig. 8)

F08 cooling duct image 3

Fig. 8


Once the duct has been cut, position it in the air deflector slot. It should come out of the slot 25.4 mm (1 in.). Drill two holes through the air deflector and duct and rivet the parts together. (Fig. 9)


F09 cooling duct image 4

Fig. 9


Dry fit the modified cooling duct (Fig. 10, #3) to the vehicle to check that enough of the duct is cut to allow it to sit between the steering motor (Fig. 10, #1) and the lower rack (Fig. 10, #2). This may require multiple cuts to the duct and several test fittings to ensure proper positioning.


F10 cooling duct image 5

Fig. 10


– Thanks to Jeff Strausser

Instrument Cluster DIC Display Dims

The Driver Information Center (DIC) display in the instrument cluster of some 2014 Silverado 1500, Sierra 1500; 2015-2016 Silverado, Tahoe, Suburban, and Sierra models, equipped with the base instrument cluster (RPO UDC), may dim or fade when the interior is very warm — due to sun load or extended heater operation — or after extended vehicle use. (Fig. 11)


F11 DIC display r

Fig. 11


The DIC display is designed to dim with high temperature exposure in order to protect the display from damage.


If the DIC display is dimming due to high temperature exposure, it is operating as designed. No repairs are necessary.


– Thanks to Jim Will

Audio Speaker Noise or Poor Sound

The audio speaker quality may be poor with a buzzing sound or rattle occurring while listening to any music source on some 2015-2016 Colorado and Canyon models. These conditions may be caused by the trim, moldings or water deflectors located in the area of a speaker and may not require speaker replacement.


Before beginning diagnosis, determine the operating conditions that may be contributing to the noise, such as the type of music, audio source, vehicle temperature, time of day, or any outside factors. Also check for any audio system-related DTCs.


TIP: Do not remove any trim or door panels prior to beginning diagnosis because their removal may mask the root cause of the condition.


Speaker Test


Music CDs do not hold tone long enough to diagnose trim rattles, so it may be necessary to obtain a GM Test CD, part number J39916-CD. Most trim rattles are caused by bass frequencies in the range of 50-80 Hz, which is included on this CD.


Insert the GM Test CD and play various tracks corresponding to the type of music the customer was listening to when the condition occurred, Try to isolate the speaker that is experiencing the condition.


When diagnosing a door speaker, be sure to close the doors and windows. If there is noise when closing the door, determine the cause of the noise before any speaker repairs are made.


Loose Trim


To diagnose any interior trim, apply hand pressure to the trim area. If the sound changes, the trim may be causing the rattle or buzz noise. The interface between a door and the instrument panel, such as from loose door trim or a water deflector, may cause the rattle or buzz noise. Inspect for any loose panels, screw covers or contact between trim panels. (Fig. 12)


F12 trim 1

Fig. 12


Water Shield


If the rattle is heard within the door trim, check several locations on the trim with your hand. (Fig. 13)


F13 trim 1a

Fig. 13


If the sound changes when pressure is applied, check the water shield position, inspect the door clips for any damage, remove any loose tape from harnesses or the door trim, and inspect the bottom of the door for any loose material.


If the rattle is caused by the water shield, install two 100 mm (4 in.) long layers of 1” x 9/16” adhesive backed foam shim stock to compress the water shield. (Fig. 14) The foam shipping blocks installed on new vehicle door edges can be used. Be sure that any added foam does not interfere with the window or door lock operation.


F14 trim 2

Fig. 14


For additional information, refer to Bulletin #16-NA-079.


– Thanks to Hassan Abdallah and Sherri Lang



Engine Stop/Start Operation after Repairs

The automatic engine Stop/Start system (RPO KL9) (Fig. 15) may be inoperable after repairs on some 2016 Encore, Envision, ATS, CTS, CT6, Cruze (VIN B), Malibu (VIN Z) and 2017 XT5 and Acadia models.



Fig. 15


The Stop/Start system is inoperable after a Stop/Start repair or any repair that required the 12V battery negative cable to be disconnected. There will not be any Driver Information Center messages or any DTCs set.


This condition is due to the learn procedure that needs to be completed on the Battery Sensor Module. It will be necessary to park the vehicle for three hours after the vehicle’s system sleep cycle, and without the vehicle being driven, to allow the learn procedure to be completed on the Battery Sensor Module.


If the vehicle is being returned to the customer before the learn procedure has been completed, advise the customer that the Stop/Start system will not operate until the vehicle has sat for three hours undisturbed after the system sleep cycle.


– Thanks to Dallas Walton

Be Aware of Engineering Information Bulletins and Part Restrictions

Technicians should always check the appropriate Service Information, including Preliminary Information and Bulletins, before every repair to ensure they are following the latest procedures, using the correct part numbers and are aware of any new information that may have been recently released regarding diagnosis, repairs, or components that may currently be on exchange or part restriction.


F16 restrictions image

Fig 16


It’s also important to run a Global Warranty Management/Investigate Vehicle History (GWM/IVH) link on the vehicle. If the vehicle has been flagged for Engineering Information, it will be identified in the search.


Engineering Information


To help obtain specific information about repair processes and component failures first hand from technicians, GM uses an “Engineering Information” (EI) process. This enables GM to gain critical information that can be used to help determine the “root cause” of a vehicle condition as well as develop and validate a repair.


The EI process compensates the dealership/technician for their time and effort to provide the technical information. The EI process is covered in Bulletin #04-00-89-053F.


Exchanges and Part Restrictions


Parts that are placed on restriction or exchange, as part of GM’s ongoing quality improvement process, require technicians to contact the GM Technical Assistance Center (TAC) or, in some cases, receive replacement authorization from the Product Quality Center (PQC). New parts that are available only in limited quantities also may be placed on restriction.


When calling TAC or PQC, a variety of supporting information is required to ensure the proper diagnosis and repairs are being made and parts are not being replaced unnecessarily. If the replacement part is authorized, it’s shipped for next day arrival. The part on restriction may need to be shipped back for analysis.


Exchanges and part restrictions can end at any time based on a number of factors. Again, check the Service Information for the latest information before making repairs and to determine if it’s necessary to set aside parts for return.


For more information about the process for exchanges and part restrictions, refer to Bulletins #02-07-30-029Z, #12-07-30-001E, #99-00-89-019M and #08-08-44-029F


New List of Information


To help dealerships stay up-to-date, following is a list of current EI Processes, Exchanges and Part Restrictions now in effect.


The information on this list is updated regularly, so check the Service Information often to ensure you have the latest information.


– Thanks to Dave Peacy

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