Archive for May 2016

New 2016 Envision Hits the Compact Mark

The new 2016 Envision (Fig. 1) is Buick’s latest world-class luxury crossover vehicle. It was designed, engineered and tested in the United States, targeting the compact crossover market between the best-selling Encore and larger Enclave.


2016 Buick Envision

Fig. 1


The four door, five passenger compact crossover features a steel body frame (unibody) and a body structure incorporating mass reducing high-strength and ultra-high-strength steels and a lightweight aluminum hood.




The Envision is equipped with an Ecotec 2.0L turbocharged engine (RPO LTG) with DOHC, continuously variable valve timing and direct injection. (Fig. 2) It produces 252 horsepower and 260 lb.-ft of torque. It also features Stop/Start technology that turns off the engine when, under certain conditions, the brakes are applied and the vehicle is at a complete stop.


F02 Envision 2.0L engine

Fig. 2


The twin-scroll turbocharger generates up to 20 pounds (138 kPa) of boost. Each of the two scrolls on the turbine is fed by a separate exhaust passage, one from cylinders one and four and the other from cylinders two and three, which virtually eliminates turbo lag at low engine speeds.


The 2.0L engine is paired with a Hydra-Matic™ 6T50 6-speed automatic transaxle (RPO M2D). (Fig. 3) The transmission features Gen 3 upgrades implemented to enhance efficiency. The pump has been moved off-axis, which allows better sealing of the torque converter, reducing pump flow demands and enhancing fuel economy. Additionally, the pump is now a binary vane-type, which allows lower power consumption during times of lower flow demands and at higher engine speeds.


Vehicle aerodynamics and fuel efficiency are enhanced with upper grille shutters that open and close at highway speeds.


2016 Buick Envision

Fig. 3


Active Twin Clutch AWD


The Active Twin Clutch All-Wheel-Drive (AWD) system electronically splits torque between the rear wheels when needed to provide additional control versus a 50/50 split in a single clutch system. (Fig. 4) It provides enhanced traction, stability and performance during vehicle acceleration and cornering as well as improved traction in wet or slippery conditions.


An all-new Twin-Clutch AWD system gives the Buick Envision surefooted control in all driving conditions

Fig 4

The Active Twin Clutch with active torque bias has increased capability to add stability across all driving conditions. In addition, fuel economy is enhanced by reducing the amount of torque sent to the rear wheels when not needed. The following video shows the system being tested.

F04V Envision awd video image



The Envision comes standard with the Buick IntelliLink® infotainment system with an 8-inch (203 mm) diagonal color touchscreen. (Fig. 5)


Available OnStar 4G LTE and Wi-Fi connects up to seven devices (smartphones, tablets and laptops) to high-speed Internet through the vehicle’s built-in Wi-Fi hotspot.

F05 Envision radio


Fig. 5


Additional features designed to provide comfort and convenience for passengers include heated and ventilated front seats and heated outboard rear seats, a panoramic moonroof, keyless access and keyless (pushbutton) start, and a programmable power liftgate with hands-free operation. The sensor location for the hands-free feature is located under the left (driver’s side) of the rear bumper, between the license plate and the corner of the bumper. Kick your foot under the bumper at this location to operate the power liftgate.


Safety Features


Available driving and parking assistance systems on the Envision include Adaptive Cruise Control, Automatic Parking Assist, Forward Collision Alert, Front Automatic Braking, Lane Change Alert with Side Blind Zone Alert, Lane Keep Assist with Lane Departure Warning, Rear Cross Traffic Alert, Rear Vision Camera, and the Safety Alert Seat. The following video shows a quick review of the safety features.

F05V Envision safety video image

An image of the area surrounding the vehicle is provided by the available Surround Vision system. The front camera is in the grille or near the front emblem, the side cameras are on the bottom of the outside rearview mirrors, and the rear camera is above the license plate.


Special Tools

The following new tools were released for the 2016 Envision:

Screen Shot 2016-06-24 at 10.40.43 AM


For additional information on the all-new 2016 Envision, refer to Bulletin #16-NA-149.


– Thanks to Sherman Dixon and Doug Daugherty

USB Flash Drive Size and other Service Programming Tips

For any service procedures that require USB and SPS programming, there are several critical steps that should be followed in order to ensure successful programming. Always refer to the appropriate Service Information for the vehicle being repaired to review the proper programming procedures. Before starting any programming event, here are a few tips to follow.


USB Flash Drive


When choosing a USB flash drive (Fig. 6), the recommended USB size is 8–16 GB unless a specific size is called out on in a Bulletin, Preliminary Information (PI), or Service Information procedure, This size range was determined through GM engineering field research as well as feedback from dealership technicians and seems to be the most common and reliable USB size range.


Fig. 6

Service programming USB downloads for vehicle control modules are usually not larger than 7GB in total. With the USB drive slightly larger than the downloaded file size, it is easier and less time consuming for the module being programmed to find and access the files on the USB drive.


Using a USB drive larger than 16 GB may increase the chance that the module may time out before it finds the calibration files that were downloaded to the USB flash drive. When this happens, an error message may appear stating that the module can’t find the files.


In addition, always use a “Brand Name” USB drive that is formatted Fat32 when downloading from the TIS2Web database.


Service Programming Checks


Battery Maintenance – Install the Midtronics® PSC 550 Battery Maintainer (SPS Programming Support Tool EL-49642) (Fig. 7) before starting any type of programming event. Battery chargers and jump boxes are not recommended for use during module programming as they can provide a voltage surge during the programming event and cause programming to fail.


F07 PSC-550SKIT_gm

Fig. 7


Wired Connection – Whenever possible, use a USB\Ethernet wired connection between the MDI\MDI 2 and the computer being used for the programming event.


Off-Peak Hours – Whenever possible, try to schedule programming events during off-peak Internet times at the dealership.


Time-Out Settings – Check the screen saver time-out settings on the computer being used. Avoid letting the computer go to sleep during a programming event. If it does, there is the possibility of a failed event.


Clear DTCs – Before any service programming event is attempted, all vehicle DTCs should be cleared. If there are DTCs present in any modules at the time of programming, it can affect successful programming.


Do Not Swap Modules – Module swapping between Global “A” vehicles should not be done. There are new security programs and systems in these modules. If modules are swapped, and reprogramming the swapped module is attempted, a failed programming event and a no start condition may result. Refer to PIP4670D (Doc ID: 3688954) for additional information.


Error Codes – Always document any error codes that come up during a programming event. These codes will help with diagnosis when contacting the Techline Customer Support Center (TCSC) for programming help.


Administrative Rights – When contacting TCSC for programming help, please make sure you have administrative rights to the computer you are using for programming. Some computer settings and security features may be blocking SPS program(s) from loading and blocking the connection to the TIS2Web database.


More Programming Info


Refer to the following documents for more information on Service Programming:

  • Service Programming System (SPS) (Document ID: 2223856)
  • #PIP4670D: Do Not Swap Modules in Vehicles with Global Electrical Systems (Document ID: 3688954)
  • #PI0592D: Service Programming System (SPS) Errors (E4398, E4399, E4403, M4404 M4413, E4414, E4423 or E4491) (Document ID: 4517565)


– Thanks to Mike Magyar


Corvette Ground Effects Shipped Separately

The process of delivering the ground effects and other loose-shipped parts for 2016-2017 Corvette models (Fig. 8) to dealerships has changed.


2016 Chevrolet Corvette Z06

Fig. 8


Due to the size of the ground effects — such as the front fascia splitter, rocker moldings and rear spoiler — the parts will be shipped from the Corvette assembly plant directly to the dealership separately from the vehicle. This new delivery process went into effect starting with VIN 1G1YS2D61G5613323, which was built on June 16, 2016.


The carbon fiber and carbon flash-painted ground effects will be shipped separately for both the coupe and convertible models. In the past, only the convertible models had the ground effects shipped separately.


The box containing the ground effects may also include additional loose-shipped parts. The list of parts in the package, including part numbers and the corresponding VIN, is included on the shipping label (Fig. 9) and in a document inside the package.


Fig. 9


Parts Arrive First


Please make sure your dealership parts department is aware of this parts shipment change. The parts should arrive at the dealership before the car.


Refer to the Pre-Delivery Inspection (PDI) form for additional information. Check the Special Inspection Items box on the form for details about exterior parts installation for specific Corvette models.


– Thanks to Jeff Strausser

Accelerator Pedal Detent

The accelerator pedal on the 2016 Malibu and 2017 LaCrosse and XT5, equipped with the 8-speed AF50 transmission (RPO MRC), features a detent approximately 3/4 of the way through pedal travel. As the accelerator pedal is applied, the built-in detent or click may be noticed with a feel of increased resistance in the pedal.


The accelerator pedal design (Fig. 10) on these vehicles equipped with the 8-speed automatic transmission provides the operator with tactile feedback near the last 1/4 of pedal travel in order to help minimize transmission downshifting, allowing for improved fuel economy and smoother operation. Applying the accelerator pedal down to the detent will allow a more relaxed acceleration rate. When pressing the pedal through the detent, the transmission will downshift aggressively, enabling an increased acceleration rate.


Do not replace any parts for this condition. This is a normal operating characteristic of the vehicle and no repair attempts should be performed.


F10 pedal r

Fig. 10


– Thanks to Aaron Huston

V8 Engine Surge Sensation during Highway Driving

A surge or misfire sensation during steady-state highway driving may be felt on some 2014-2016 Corvette and 2016 Camaro and CTS-V models (Fig. 11) equipped with the 6.2L V8 engine (RPOs LT1, LT4) and the 8-speed automatic transmission (RPO MU5). The sensation may be noticed most often in 6th, 7th, or 8th gear, in manual or automatic mode, with an engine speed between 1,000 and 2,500 rpm under load. The Torque Converter Clutch (TCC) will be engaged and there will not be any misfire data or P0300 (Engine Misfire) DTCs set.


2016 Cadillac CTS-V Sedan

Fig. 11


TCC slip with this condition present may show on a scan tool of +/- 6–0 rpm. This occurs at about 30–60% throttle. This sensation, or chuggle, with the TCC locked is a normal condition.


Full-size trucks equipped with the Gen 5 V8 engine (RPOs L83, L86) may not exhibit this condition because they usually have 15-50 rpm of TCC slip speeds, which absorbs any engine chuggle sensation.


The normal operation of engines and transmissions generate various vibrations and the engine and transmission mounts are designed to isolate these vibrations from the rest of the vehicle. While the mounts do a great job of isolating most vibrations, there still may be certain engine loads and rpms that generate vibrations that drivers may feel in the vehicle. Changes in engine load or rpm will change the vibrations produced, making it more or less apparent to occupants in the vehicle.


When issues of this nature are encountered, like equipped vehicles should be compared and, if consistent results are identified, should be considered a normal characteristic of vehicle operation.


– Thanks to Tracy Lucas

Seatback Recliner Handle Now Available

New parts are now available for a broken front seatback recliner handle on 2015-2016 Colorado and Canyon models. The newly designed part applies to models built from start of production until April 18, 2016.


When removing the broken handle, use a flat-bladed tool to release the recliner handle retainer from the handle assembly and to release the handle from the cushion outer finish panel cover. (Fig. 12)


F12 seatback recliner

Fig. 12


Refer to Bulletin #16-NA-184 for additional information and part numbers. When ordering parts, be sure to order the correct color and LH or RH side handle for the vehicle being repaired.


– Thanks to Charles Hensley

Service Know-How

10216.06V – Emerging Issues

June 9, 2016


A review of the latest service topics from Brand Quality and Engineering, including a look at the all-new 2017 Acadia and 2016 Silverado and Sierra 2500 and 3500 trucks with Digital Steering Assist.


F13 EI image

FIG. 13


To view Emerging Issues seminars:

  • Log in to
  • Select Resources > Video on Demand > GM STC Channel > Search Videos; or
  • Select Catalog to search for the course number, and then select View > Take or Continue Course


All-New 2017 Cadillac XT5 Luxury Crossover

The 2017 Cadillac XT5 is an all-new midsize 5-passenger luxury crossover (Fig. 1) replacing the SRX model. It uses a unique chassis and structure that is 278 lbs. (126 kg) lighter than its predecessor, but with a two-inch (5 cm) longer wheelbase and a one-inch (2.5 cm) wider track.


The first-ever 2017 Cadillac XT5 is a comprehensively upgraded luxury crossover and the cornerstone of a new series of crossovers in the brand’s ongoing expansion. The XT5 further builds on Cadillac’s trademark attributes of distinctive, sophisticated and agile vehicles. Pictured: 2017 Cadillac XT5 Platinum; Exterior paint shown in in Red Passion Tintcoat; Interior environment shown in Maple Sugar with Jet Black accents and Satin Rosewood wood trim.

Fig. 1


New Powertrain


The XT5 is powered by the new 3.6L V6 engine (RPO LGX) with direct injection (DI), dual overhead camshafts (DOHC) and variable valve timing (VVT). It generates 310 horsepower and 270 lb.-ft. of torque. It features Stop/Start technology that automatically stops and starts the engine at traffic stops, saving fuel and reducing emissions.


TIP: Drivers may notice a detent/click in the accelerator pedal at roughly 3/4 of pedal travel. This built-in detent provides feedback to minimize transmission shifting, allowing for improved fuel economy and smoother operation. Pressing to the detent will allow a more relaxed acceleration rate. When pressing through the detent, the transmission will downshift aggressively.


The 3.6L V6 is linked to the new Aisin AF50-8 8-speed automatic transmission with Electronic Precision Shift (RPO MRC). Electronic Precision Shift is a shift-by-wire system that uses an electronically controlled transmission shifter (Fig. 2), which reduces noise and vibration and provides more space under the center console. There is no cable or linkage, with the chassis control module monitoring the position of the shift lever and communicating information to the transmission range control module.


F02 xt5 shifter

Fig. 2


An optional new Active Twin Clutch AWD system allows for the transfer of up to 100 percent of available torque to either the front or rear axles. The system’s electronically controlled rear differential can then direct that torque to either wheel laterally. This design is especially helpful when encountering roads where there is more water, ice or snow on one side.


The AWD system also has a new disconnect feature that disables the rear drive unit, leaving the vehicle in FWD mode for better fuel efficiency and reduced emissions.


Continuous Damping Control


The suspension features a MacPherson Strut design up front and a five-link independent design in the rear. An available Continuous Damping Control (CDC) system manages ride control in real time.


Standard on vehicles equipped with 20-inch wheels, Continuous Damping Control is an electronic suspension control system that monitors vehicle speed, steering wheel position, engine torque, brake pressure, the suspension position sensors and the multi-axis sensor to determine the proper damping forces. The module uses these inputs to separately control each of the shock absorbers. Changes of the damping forces can be accomplished within milliseconds. Suspension characteristics can be changed at any time by activating the Sport Mode or Tour Mode.


The CDC shock absorbers have integrated actuators that are PWM-controlled to change the amount of damping provided. The suspension control module varies the amount of current. A higher current provides a higher rate of damping and stiffens the suspension. Less current reduces the rate of damping. The shock absorber uses a proportioning valve to control the amount of damping. Opening the valve allows more oil flow and softens the damping while closing the valve restricts the oil flow and firms the damping.


Safety Features


Available parking assistance systems include Rear Vision Camera, Rear Parking Assist, Front Parking Assist, Surround Vision, Front Vision Camera, Rear Automatic Braking and Backing Warning System, Rear Cross Traffic Alert, and Automatic Parking Assist.


Available driver assistance systems include Adaptive Cruise Control, Forward Collision Alert, Intelligent Brake Assist, Lane Change Alert with Side Blind Zone Alert, Lane Keep Assist with Lane Departure Warning, and Safety Alert Seat.


The XT5 comes equipped with a TRW EBC460 antilock brake system. The electronic brake control module and brake pressure modulator are serviced separately. Brake control systems include electronic stability control, traction control, dynamic rear proportioning, hill hold start assist, cornering brake control, trailer brake control and trailer sway control.


Rear Camera Mirror


A new feature that debuts on the XT5 is Cadillac’s patented new Rear Camera Mirror (standard on Platinum models). (Fig. 3) A high-dynamic range camera records wider images behind the car and streams them to video-processing software, which removes obstacles such as the roof, rear pillars and rear seat passengers, to project an unobstructed view.


F03 xt5 mirrorFig. 3

The images are projected on a 1280- x 240-pixel LCD display, with the system enhancing the driver’s rear vision by an estimated 300 percent. (Fig. 4) The mirror can be changed to a traditional electrochromatic rearview mirror by flipping the toggle on the bottom of the mirror.


F04 xt5 mirror zone

Fig. 4


The camera that provides the Rear Camera Mirror image is above the license plate, next to the Rear Vision Camera. A water-shedding hydrophobic coating is applied to the camera to keep it clean to maintain visibility regardless of the driving conditions.


Upgraded Cadillac CUE


The Cadillac CUE system has been upgraded for the XT5. A faster and more powerful processor provides enhanced response and accuracy. The XT5 comes with an 8-inch (203 mm) diagonal color-touch display. (Fig. 5)


The first-ever 2017 Cadillac XT5 is a comprehensively upgraded luxury crossover and the cornerstone of a new series of crossovers in the brand’s ongoing expansion. The XT5 further builds on Cadillac’s trademark attributes of distinctive, sophisticated and agile vehicles. Pictured: 2017 Cadillac XT5 Platinum; Exterior paint shown in in Red Passion Tintcoat; Interior environment shown in Maple Sugar with Jet Black accents and Satin Rosewood wood trim.

Fig. 5


Special Tools


The following new tools were released for the 2017 XT5.


Screen Shot 2016-06-03 at 12.21.18 PM


Thanks to Sherman Dixon and Tom Burlingame

New 3.6L V6 Engine with Auto Stop/Start Technology

The new 3.6L V6 engine (RPO LGX) — standard on the 2017 XT5 — ushers in new benchmarks for efficiency, refinement and durability. (Fig. 6)

2016 3.6L V-6 AFM VVT DI (LGX) for Cadillac ATS

Fig 6

The engine’s clean-sheet redesign represents the fourth generation of GM’s acclaimed DOHC V6 family and incorporates new features, including Active Fuel Management (AFM), also known as cylinder deactivation, as well as Auto Stop/Start technology, both of which enhance fuel economy.


Performance and efficiency are further optimized by technologies introduced on previous generations, including direct injection (DI) and continuously variable valve timing (VVT).


The 3.6L engine produces 310 horsepower and 270 lb.-ft. of torque running on regular unleaded fuel with a posted octane rating of 87 or higher.


New Components


The cylinder heads are a two piece design consisting of a head and a camshaft carrier that are cast aluminum with powdered metal valve seat inserts and valve guides. The two piece design allows for the AFM System.


In the RPO LGX engine, the valves and seats are constructed with specialized materials and coatings, and the exhaust valves are sodium filled for robustness. The cylinder heads also feature a “high-tumble” port design, and are sealed with LGX specific head gaskets. The head gaskets are also specific to the LH and RH sides.


The engine also has unique higher-flow fuel injectors and fuel pump. The cylinder head has a larger bore for the new larger diameter fuel pump follower that operates the higher-flow pump. The fuel injectors are retained to the fuel rail in a new “twist-lock” retention scheme that does not require special tools for service.


The new engine has unique oil pans depending on orientation, with the pans being separated into an upper (traditional aluminum) and lower (stamped steel) pan. This configuration helps with noise and mass concerns. It also affords some serviceability improvements through not needing to remove the entire upper pan for some service procedures.


TIP: The engine’s crankshaft balancer may appear that it is wobbling or vibrating, or that the mounting bolt appears incorrectly centered on the balancer. This is simply an optical illusion likely caused, in part, by the contrasting colors of the silver crankshaft balancer bolt and the black balancer. Performance is not affected and no replacement of parts is necessary.


Active Fuel Management


AFM components include the camshafts, valves, switching roller finger followers (SRFF), also known as the valve switching rocker arms, dual-feed hydraulic lash adjusters and an oil control valve (OCV), which is also known as the valve rocker arm oil control valve.


AFM saves fuel by seamlessly and automatically switching from 6- to 4-cylinder mode under low or moderate loads. Depending on engine RPM, the ECM sends a signal to the OCV, commanding it either on or off. With the AFM system on, the OCV directs oil to the dual-feed hydraulic lash adjuster, unlatching the SRFF and creating zero lift, thereby not allowing the valves to open on cylinders two and five. AFM is active at this time.


With the AFM system off, the OCV is not active and no oil is directed to the dual-feed hydraulic lash adjuster. The SRFF operate as normal rocker arms. AFM is inactive at this time.


Auto Stop/Start


When the brake pedal is applied and the vehicle is at a complete stop, the Auto Stop/Start system may turn off the engine, depending on operating conditions, including minimum vehicle speed, engine and transmission operating temperature, ambient temperature, battery charge, and HVAC settings. When the engine is off, the tachometer will read AUTO STOP. (Fig. 7, #1) Upon releasing the brake pedal or applying the accelerator, the engine will restart. After parking the vehicle and turning off the ignition, the tachometer will read off. (Fig. 7, #2)


F07 xt5 tach

Fig. 7


– Thanks to Tom Burlingame and Sherman Dixon

Digital Angle Gauge Required for Corvette Rear Wheel Alignment

As part of a rear wheel alignment on the 2014-2016 Corvette for track events and competitive driving, the rear wheel caster must be set. To measure rear wheel caster, a digital angle gauge and an adapter, which attaches the gauge to the rear knuckles, are required. The gauge must be capable of accurately measuring to 0.1 degree. It must also have a calibration feature and a magnetic base so it will attach to the adapter.


Adjusting rear caster was not part of the alignment process on the 6th generation Corvette. For the C7 Corvette introduced in 2014, the rear caster adjustment allows for the ideal suspension geometry regardless of factory build variation. Rear caster accuracy and symmetry is an important aspect of the ride steer performance. Even small changes in rear steering angle can have a big effect of vehicle handling.


Digital Angle Gauge


The digital angle gauge required to measure the caster angle is available through GM Tools and Equipment but is not an essential tool for the Corvette as there are several suppliers available in the aftermarket.


Tool suppliers that offer the gauge include:

•       GM Tools and Equipment; order tool number CH-47960, Digital Angle Gauge, (Fig. 8) directly from

•       Wixey WR300; contact

•       iGauging AngleCube; contact or call 1-949-366-5708


F08 CH 47960 gauge

Fig. 8


Digital Angle Gauge Adapter


The Digital Angle Gauge Adapter, CH-47960-10, is custom-designed to fit the Corvette knuckle. (Fig. 9) It is not available in the aftermarket and was shipped to all authorized Corvette dealerships as part of the essential tool package for Corvette for the 2014 model year.


F09 CH 47960-10 adapter

Fig. 9


Available as Loan Tools (U.S.)


Both the Digital Angle Gauge, CH-47960, and the mounting adapter CH-47960-10, are available through the new GM Loan Tool Program. The Loan Tool Program enables dealerships to request a special tool through the GM Special Tools Website.


Dealerships must access the GM Special Tools website through the GlobalConnect link in order to enable the Loan Tool button on the website. Once ordered through the website, the tools will be sent to the dealership the next business day.


Rear Wheel Alignment


When performing the rear wheel alignment, adjust the camber settings first, followed by the caster and toe settings. Follow the appropriate Service Information procedure for each adjustment, including using the alignment specifications provided.


Before installing the gauge mounting adapter to the knuckle, use a soft nylon bristle brush to clean debris from the adapter holes. Install the digital angle gauge and the gauge mounting adapter as a unit to the knuckle. (Fig. 10)


F10 angle gauge installed

Fig. 10


Use an alignment machine to measure rear wheel camber and the digital angle gauge to measure rear wheel caster. Rotate the cam bolts to the required camber and caster settings, maintaining the settings while tightening the cam bolt nuts.


– Thanks to Jeff Strausser

Corvette Competitive Driving Wheel Alignment Tips

Some 2014-2016 Corvette owners may want the vehicle’s wheel alignment set-up for track events and competitive driving. (Fig. 11) The vehicle must be returned back to the original specifications after the driving events. Changing the alignment for driving events is not covered under the GM warranty.


The 650-hp, 2016 Chevrolet Corvette Z06 is one of the most capable vehicles on the market, capable of accelerating from 0 to 60 mph in only 2.95 seconds, achieving 1.2 g in cornering acceleration, and braking from 60-0 mph in just 99.6 feet.

Fig. 11


TIP: Using these wheel alignment settings may cause excessive tire wear. Remind customers to only use these wheel alignment settings for track events or competitive driving.


The following track event and competitive driving wheel alignment settings apply to vehicles equipped with the Z51 package, Z06 models and Grand Sport models. When performing the wheel alignment, do not adjust the trim height.


The alignment should be performed by first removing washers between the upper control arms and frame. (Fig. 12)


Z51 – Remove a maximum of one washer per front upper control arm bolt and one washer per rear upper control arm bolt.


Z06 – Remove a maximum of one washer per front upper control arm bolt. Do not remove washers from the rear upper control arm bolts.


Grand Sport – Do not remove washers from the front or rear upper control arm bolts.


F12 control arm washers

Fig. 12


Adjust the lower control arm cam bolts until alignment is within the alignment specifications listed in the appropriate Service Information. The Owner Manual Track Events and Competitive Driving section does not list a +/– tolerance for any of the alignment specs.


Front (per corner)

Caster: +7.0 degrees

Camber: –2.0 degrees

Toe: 0.05 degrees toe in


Rear (per corner)

Caster: 0 degrees

Camber: –2.0 degrees

Toe: 0.05 degrees toe in

Thrust Angle: 0 degrees


– Thanks to Jeff Strausser

TAC Builds on Customer Satisfaction Improvements

Customer service is at the forefront of the goals at the U.S. GM Technical Assistance Center (TAC). Every TAC consultant strives to provide top quality service each time a technician calls for diagnostic help with a vehicle.


These efforts are paying off. For the past eight months, TAC has exceeded the service level goal of 70 percent of calls answered within 60 seconds.


Survey Results


Earlier this year, new survey results indicated TAC achieved a customer satisfaction rate of 88 percent for 2015. At TAC, the survey results are taken very seriously, and feedback that is provided — positive or negative — is always appreciated. TAC surveys are reviewed to help identify areas where continued improvements are needed as well as to help determine how recently implemented changes are working. Callers are encouraged to provide TAC with their current email address to ensure participation in the next survey.


In March, TAC introduced a slimmed down phone prompt system, which is designed to reduce the number of prompts needed to get to a TAC consultant. The new system:

• Removed unnecessary layers and selections • Clearly identified the need for a TAC consultant vs. a Techline consultant


Technicians that call in for assistance on Saturday should leave a voicemail on the system. They will receive a call back on Monday morning.


Training Update


At the end of April, 109 TAC consultants have achieved Bronze Certification within TAC, indicating a total of 324.25 hours of training. The goal is to achieve Master Certification throughout TAC. This certification training is in addition to the more than 3,100 technical training hours taken in 2016.


In addition, all new consultants will be required to take and successfully pass a series of technical training classes geared toward optimizing their current technical aptitude. This will ensure all TAC new hires are ready and able to take calls for their respective lines of business with an added level of confidence in order to provide the best possible support to all TAC callers.


The success of the TAC depends on our relationship with everyone in the dealership service department. We will continue to strive for improvements to help provide an outstanding customer experience.


– Thanks to Elizabeth Belland

Blu-ray Discs Not Playing

Certain Universal Studios Blu-ray discs released after October 2015 may not start playing when the Play icon is pressed on some 2013-2016 SRX, XTS; and 2014-2016 Escalade, LaCrosse, Silverado, Tahoe, and Yukon models equipped with the Rear Seat Entertainment system (RPO UWG, UWJ or U42).


When users select “Play,” to begin playing an affected Blu-ray disc, the disc menu disappears and the menu background animation continues to loop.


Advise owners that GM is aware of the condition with these Blu-ray discs and is working on a solution. In the interim, owners can work around this condition by viewing the chapter or scene selection menu and choosing the first chapter or scene to begin playing the movie. (Fig. 13)


F13 scene menu

Fig. 13


– Thanks to Dave Gumpert

Transmission Electrical or Communication DTCs

Some 2005-2010 Cobalt, 2005-2011 HHR, and 2005-2006 Pursuit models may have transmission-related electrical or communication DTCs that may be intermittent and difficult to duplicate.


Check the transmission wiring harness located beneath the engine cover. It may have a bare spot or be pinched at the engine block near the oil filter.


If no wiring concern is found, check the 20-way connector for proper connection/pin fit and fully reseat the connector.


F14.1 trans connector 2

Fig 14


– Thanks to Tom Ellison

Charge Air Cooler Coupler O-ring Seal

Reduced engine power may be noticed on some 2013-2016 Regal, ATS, Malibu; 2014-2016 CTS; and 2016 CT6 models equipped with the 2.0L engine (RPO LTG). DTCs P015B (HO2S Delayed Response Lean to Rich Bank 1 Sensor 1) and/or P1101 (Intake Air Flow System Performance) may be set.


If these conditions are found, check for a missing or damaged O-ring seal in the charge air cooler coupler, located on the passenger side of the charge air cooler where the air duct inserts into the coupler. (Fig. 14)


F14 coupler

Fig. 15


– Thanks to David Rutkowski

Service Know-How

10216.05D – Emerging Issues

May 12, 2016


A review of the latest service topics from Brand Quality and Engineering, including a look at the convertible top operation of the 2016 Camaro and Cascada.


F15 ei camaro top

FIG. 16


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

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