Archive for August 2014

Questions on Installing GM Accessories?

If you have installation or parts concerns when installing GM Accessories, or are diagnosing components that you are installing, there are several sources of information that are available to help.


Instruction Sheets

If the instruction sheet was not packaged with the GM Accessory, check the Accessories Manual in the appropriate Service Information. To locate the instructions, select the year, make and model of the vehicle from the dropdown menus. Next, from the Publication page, select the Accessories Manual link. (Fig. 1)


F01 si accessories

Fig 1


Accessory Distributor Installer (U.S.)

If your dealership has not received the Limited Production Option (LPO) part or received the incorrect LPO part, contact your local Accessories Distributor Installer (ADI).



Questions regarding the accessories can be directed to Partech. Contact Partech for the following reasons:

• Missing instruction sheet (including if the instruction sheet is not found in the Service Information)

• Missing components

• Quality Issue with the kit

• Usage questions (vehicle compatibility, part fit, etc.)


Partech can be reached at 1-855-GMCARES (1-855-462-2737). For U.S and Canada (Car and Truck), select the following prompts when calling:

1. Select Prompt 2 for ParTech.

2. Enter the 6-digit dealer customer code.

3. Enter the part number of the accessory in question. If there is a known issue, a message will play.

4. If further assistance is needed, select Prompt 2 to speak with a Partech analyst in the accessory group.


Technical Assistance Center

Any questions about the installation of the accessory, or help with diagnosing problems with the installation, contact the Technical Assistance Center (TAC).


Techline Customer Support Center

For programming concerns with GM Accessories, contact the Techline Customer Support Center (TCSC).


– Thanks to Ernest Haller and Lori Thomas


The Numbers are In

The results of the TechLink reader survey are in. The recent survey asked technicians and other dealership personnel to provide their input about a number of TechLink features as part of our goal of providing you with the latest service news in a timely and convenient manner.


The purpose of the survey is to collect feedback on technician satisfaction and to gain a better understanding about the features of TechLink that technicians 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 (58 percent) or good (36 percent). TechLink will continue to strive to provide the very latest GM service news affecting dealership technicians.


The coverage of features and repairs on new model was rated excellent (59 percent) or good (34 percent) by most readers.


Readers also rated their satisfaction as excellent (54 percent) or good (37 percent) with the coverage of technical information about how systems/components work.


More than half of respondents rated the coverage of specific repairs from Bulletins and Preliminary Information as excellent (55 percent) and many more gave the coverage a rating of good (38 percent).


The coverage of programming and other Techline information was more evenly rated, with most readers rating the coverage at excellent (49 percent) or good (45 percent).


Overall, the suggestions for which topics should be covered more often in TechLink were led by new model information (35 percent). Programming (24 percent) and basic repair information (25 percent) were also popular. A smaller percentage of readers requested more special tool coverage (16 percent).


A few features of the website also were surveyed, including the printable PDF and the blogs. Half of readers say they view or print the PDF, which provides a convenient summary of all the articles posted for the last month. Its magazine-style format makes it easy to print and read at any time.


The blogging feature allows readers to comment on a topic or ask a question regarding information in an article. Most readers (86 percent) have either commented on an article or regularly read the blog comments.


The reader survey indicates that many of you are satisfied with the coverage and information found on the TechLink website. 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 page. Thanks for your input.


– Thanks to Lisa Scott

2015 Camaro Convertible Tonneau Cover Option

F02 ss convertible

Fig 2


For the 2015 model year, the Camaro convertible tonneau cover (RPO E45) is standard equipment only on 2SS and ZL1 models. The tonneau cover is optional on all other 2015 Camaro convertible models. This is a change from the 2014 model year.


For the 2014 model year, the tonneau cover was standard on 2LT, 2SS and ZL1 models and was optional on 1LT and 1SS models.


Warranty claims for missing tonneau covers are being reviewed. Before ordering a replacement part due to a missing tonneau cover, verify the vehicle is equipped with RPO E45.


– Thanks to Ann Briedis

New Soft Stop Plus Door Glass Operation

The 2015 ATS coupe (Fig. 3) has a new door glass feature called Soft Stop Plus. Designed to improve door closing vibration and sound quality, the Soft Stop Plus feature allows more glass engagement to the belt line seals on door closing.


2015 Cadillac ATS Coupe

Fig 3


Soft Stop Plus operation is different than previous door glass operation. Express down and supervised down (holding the window switch) will both stop the glass above the belt line. (Fig. 4) The second express or supervised switch command will lower the glass below the belt line. (Fig. 5) The Comfort Open feature (pressing and holding the Unlock button on the key fob to open all windows from outside the vehicle) will stop the glass above the belt line. The window operation is the same regardless if the door is opened or closed.


F04 3965349

Fig 4


F05 3965350

Fig 5


TIP: The door glass will go to the full down position below the belt line every 50 cycles of the window switch to recalibrate.


It is important to remember that the door glass stopping above the belt line seals is normal. Do not replace the window regulator or adjust the glass to change this feature. There may be small differences in the glass height above the belt line when comparing the left and right sides of the vehicle. Some variation of the height also is influenced by weather and temperature conditions, which is normal and should not be adjusted.


– Thanks to Stephen Jacob

Tapping Noise Heard while Driving

A tapping noise may be heard while driving some 2010-2014 LaCrosse and 2013-2014 Regal models.


The tapping noise will be heard inside the vehicle and may seem to be coming from the front of the door; or from the ″B″ pillar if the vehicle is equipped with a sunroof. The cause of the noise may be loose wheel well liners in the front fenders, which may produce a tapping/rattle noise as the vehicle is driven. The noise will typically get more pronounced the faster the vehicle is driven, as this condition is affected by air flow.


Lift the vehicle and inspect for loose or undersized push pin retainers in both the left- and right-side front fender liners. Also check that the insulators are securely in place behind the front wheel liners. (Fig. 6) Replace the push pin retainers as necessary.


F06 3404866

Fig 6


– Thanks to David Roat


Oil Canning Noise in Rear Seat Area

On some 2010-2014 Camaro coupe models, an oil canning or popping noise may be heard coming from the rear seat foot well area while driving. This condition is most noticeable on rough, uneven roads or when turning into a driveway.


The noise may be caused by “oil canning” of the sheet metal in front of the rear seat lower cushion. To correct this condition, raise the vehicle and use a ball-peen hammer or similar tool to dimple the panel as shown. (Fig. 7) Cover the dimpled surface of the panel with a butyl patch.


F07 2748582

Fig 7


– Thanks to Matt Bierlein

Difficult to Rotate Ignition Key

The ignition key on the 2010-2012 LaCrosse may be difficult to turn to the Lock/Off position if the key is rotated slowly. If the key is rotated quickly from the Run position to the Off position, the condition is not noticed. Other electrical functions on the vehicle may also be inoperative when the key is in the Accessory position, such as the Radio, Power Windows, etc.


This condition may be caused by voltage dropping out on circuit 143 when the key is in the Accessory position.


Verify the F22DA (DLIS) fuse is not open. This fuse is located in the X51A Instrument Panel fuse block position #22. (Fig. 8) If the fuse is open, diagnose the associated circuits to determine the root cause.


F08 PIC5668

Fig 8


– Thanks to Christopher Hightower

Approach Lighting Operation

For the ground illumination lamps, or puddle lamps, to operate on 2007-2014 Escalade models; 2007-2013 Avalanche, Silverado, Suburban, Tahoe, Sierra, Yukon models; 2014 Silverado 2500/3500, Suburban, Tahoe, Sierra 2500/3500, and Yukon models, the “Approach Lighting” option must be turned on using the Driver Information Center (DIC) buttons. The lamps will not turn on unless the ambient lighting is dark enough. If the option is selected in the DIC and the light conditions are met, when the Unlock button is pressed on the key fob, the Approach Lighting will illuminate for approximately 20-30 seconds.


TIP: On previous models, the ground illumination lamps also would illuminate when exiting the vehicle. There was a design change made and the lamps will no longer illuminate when exiting the vehicle, unless the Unlock button is pressed on the key fob.


– Thanks to Scott Fibranz

Electric Power Steering System Diagnosis

The 2014-2015 Silverado 1500 and Sierra 1500 and 2015 Tahoe, Suburban, Yukon and Escalade are equipped with an electronically operated power rack and pinion steering system. (Fig. 1) The system replaces conventional hydraulic pump, lines, control valves and pistons with an electric motor, a control module, and associated hardware. These components, along with the rack and pinion, are assembled into an integral steering gear.


The system is not the same electric rack and pinion system used in previous model year hybrid vehicles.


F01 steering gear assembly

Fig 1


A torque sensor integrated with the steering gear pinion in the steering gear detects a need for steering assist. This information, along with motor rotation and serial data, is processed by the control module, which is integral with the motor. The control module commands power to operate the AC electric motor, which drives a belt. The belt operates a ball-nut, which is in line with the steering rack, and provides assistance in moving the rack right or left as required.


Diagnosis and Moisture


If normal diagnosis of an operating condition in the power steering system leads to removal of the electric motor, it is necessary to inspect the motor components for evidence of water intrusion. (Fig. 2) It is possible for water to intrude through a hole in a boot or a connector issue causing the leak path.


F02 steering gear moisture

Fig 2




If evidence of moisture is detected during disassembly, replace the entire steering gear. Replacing only the power steering assist motor/control module is not a permanent repair.


Refer to Electric Belt Drive Rack and Pinion Steering Gear Replacement in the appropriate Service Information.


During removal and installation, the electric belt drive rack and pinion steering gear is extremely susceptible to damage. Dropping or prying on the electric belt drive motor controller module and/or electric belt drive rack and pinion steering gear may cause damage. If damage occurs, the electric belt drive motor controller module and/or electric belt drive rack and pinion steering gear will need to be replaced.


Also observe normal service precautions to avoid damage and possible malfunction of the SIR system. These include securing the steering wheel in the straight ahead position before disconnecting the steering column, intermediate shaft or steering gear. Failure to do this may cause the SIR coil assembly to become un-centered.




During power steering assist motor installation, ensure that it is not misaligned with the steering gear housing; otherwise, proper belt tension will not be achieved. Misalignment of the belt on the pulley will damage the belt and the steering gear will need to be replaced. Use new power steering assist motor bolts.


Use the GE-50576-A tension tester to achieve the proper belt tension. (Fig. 3) Strum the steering gear belt three times as close as possible to the center position between the two steering gear pulleys to get an average belt tension reading. Check the reading with the specification in the Service Information before tightening the motor bolts. If the tension reading is not within the specified Hz range, loosen the assist motor pivot bolt and rotate the motor clockwise to increase the tension or counterclockwise to reduce the tension on the belt. Tighten the pivot bolt and retest the belt tension three times.


F03 steering gear belt tester r copy

Fig 3


Once all installation is complete, perform the power steering control module setup procedure.


– Thanks to David MacGillis


Wireless Charging System for Mobile Devices

A new Mobile Device Wireless Charging System for smartphones is optional on 2015 ATS sedan and coupe and CTS sedan. Compatible with Powermat and other in-phone wireless charging technologies, this convenient new feature eliminates the need for charging cords.


An increasing number of smartphones have wireless charging either embedded or as an option. The Mobile Device Wireless Charging System is an inductively coupled means for wirelessly charging mobile devices. To charge a compatible device using the wireless charging system, the device is simply placed on the rubberized pad.


A compatible device is one that is compliant with the Power Matters Alliance (PMA) or Wireless Power Consortium’s (WPC) Qi Standard, meaning that it is equipped with a PMA or Qi wireless charge “receiver” that will work with the charge “transmitter” installed in the vehicle. A device may use built-in charging circuitry or an adapter (external plug-in device which contains the charging circuitry).


Charging Surface Location


The wireless charging mat is located inside the storage bin behind the motorized center instrument panel faceplate of the ATS and CTS sedan. (Fig. 4)


F04 wireless compartment

Fig 4



Charging a Device


To charge a device, place it on the charging surface in the vehicle (all other objects should be removed from the charging surface). There is a charging coil located in the center of the charging surface and the mobile device has a charging coil typically near the center of the device. These coils must be lined up in order for charging to proceed. With the device face up, move it around slowly until the battery charging symbol displays on the infotainment touch screen, indicating the device is charging.


TIP: If the device does not charge, verify it is properly positioned on the charging surface. It may be necessary to rotate it 180 degrees to help establish a connection. Also, the use of a protective case may require more precise placement or may inhibit charging. Try removing the case.


When the Interruptible Retained Accessory Power (IRAP) relay is closed (when the vehicle ignition is in Run or Accessory position), the system is able to detect the device, establish communications with the device to confirm it is a compatible device, and then deliver charging power to the device via the wireless interface.


If a non-compatible device or metallic foreign object is detected, the system will not transfer power. The charger monitors its internal temperature and will shut down if it the charger temperature exceeds 185F (85C).


The BCM will detect the device battery is charging and send a serial data message to the infotainment touch screen, which will indicate a device is currently charging. When the indicator is toggling on and off, it indicates a thermal limit has been reached and the device will not charge. Charging also may be interrupted while driving over rough conditions. Reposition the mobile device to continue charging.


TIP: For any Mobile Device Wireless Charging System concerns, refer to circuit/system verification and testing in the appropriate Service Information. A scan tool cannot be used since the system is not connected to any control module. No DTCs or data parameters are available.


Compatible Devices


Following are some of the most popular devices that have built-in wireless charging capability or have wireless charging adapters.



For the latest information about mobile device compatibility with the wireless charging system, go to


– Thanks to Jean Hart


Updated September 5, 2014

Front Door Window Jamming

The driver or passenger front door window may become jammed and will not rise above half-way on some 2011-2014 Caprice PPV, SS, and 2008-2009 G8 models. The front edge of the door glass may become dislodged from the front window run channel and seal. This usually occurs when the front door has been slammed closed with the window fully lowered.


TIP: Once the glass has become dislodged from the front window run channel and seal, the metal channel will likely be distorted and need to be replaced. The seal normally does not require replacement.


Add Foam Spacer


When replacing the window front run channel (Fig. 5), it’s necessary to add a foam spacer (part number 92289653) to both front doors.


To add the foam spacer, remove the front window run channel from the door.


F05 window run channel

Fig 5


Fit the foam spacer to the bottom outboard side of the new replacement front window run channel. Ensure the spacer is centered, glue side down, on the channel and positioned 5 mm (0.20 in.) from the bottom end. (Fig. 6)


F06 window spacer 5mm

Fig 6


With the new front window run channel in the door, the foam spacer (Fig. 7, A) should touch against the side intrusion beam. (Fig. 7, B)


F07 window side beam

Fig 7


After properly securing the run channel and window glass on the affected door, add the foam spacer to the other front door between the front window run channel and the door side intrusion beam.


For additional information, refer to Bulletin #12-08-64-004A.


– Thanks to Brad Thacher

Transmission Fluid Leaking from Vent

After installing a remanufactured transmission or valve body on 1997-1999 Riviera, Aurora, 88; 1997-2004 Regal; 1997-2005 Century, LeSabre, Park Avenue, Bonneville; 2002-2007 Rendezvous; 2005-2007 Terraza, RELAY; 2005-2009 LaCrosse (Allure); 2006-2011 Lucerne; 1997-2001 Lumina; 1997-2007 Monte Carlo; 1999-2005 Venture; 2001-2011 Impala; 2005-2008 Uplander; 2006-2007 Malibu; 1997 Cutlass Supreme; 1998-2002 Intrigue; 1999-2002 Silhouette; 2001-2002 Aurora; 1997-2008 Grand Prix; 1998 TranSport; 1999-2008 Montana; 2001-2005 Aztek; and 2006-2009 G6 models, equipped with the 4T65 automatic transmission (RPOs M15, MN7, MN3, M76 and MD7), transmission fluid may leak from the vent, which may be caused by a worn, oversized pressure regulator valve bore in the valve body. The worn valve body may cause line pressure to leak into the exhausted port just under the transmission vent. (Fig. 8)


F08 trans vent

Fig 8


If transmission fluid is evident, inspect the transmission for the following conditions:

• Transmission fluid level overfilled

• Incorrect fluid level indicator

• Water or coolant in the fluid (milky fluid)

• Plugged or damaged vent

• Transmission case porous in the vent area

• Case cover assembly (channel plate) not torque properly

• Case cover assembly gasket installed incorrectly


If the cause of the transmission fluid leak is not found after inspected these items, the valve body should be replaced.


– Thanks to Mark Kevnick



Rear Vision Camera Display Size

On the 2014-2015 Sonic, Spark and Trax equipped with the Rear Vision Camera (RPOs UF7 and UVC), the camera display only occupies approximately 3/4s of the infotainment screen. (Fig. 9)


F09 camera display image

Fig 9


This is a normal characteristic of the camera display and the Rear Vision Camera. Do not replace any parts for this condition.


– Thanks to Ange Girolamo


Power Door Locks Unlock after Auto Locking

The power door locks on some 2013 LaCrosse, Regal; 2013-2014 Malibu, Sonic; and 2013-2015 Camaro and Spark models may unlock immediately after automatic locking occurs — usually at startup or while driving. This may occur after the vehicle has been in an accident where the vehicle’s airbag(s) and or seatbelt(s) have been replaced due to being deployed but the Sensing and Diagnostic Module (SDM) was not replaced because DTC B0052 (Deployment Commanded) could be cleared.


Using a scan tool, build the vehicle, select “Inflatable Restraint Sensing and Diagnostic Module” and then select “Identification Information.” If the value for Software Module 1 Identifier is greater than zero, the SDM has commanded a deployment and is the source of the door unlock command. This can be confirmed by removing the fuse that provides B+ to the SDM. If the doors no longer unlock after automatic locking, replace the SDM. (Fig. 10)


Refer to the Airbag Sensing and Diagnostic Module Replacement section of the appropriate Service Information for SDM replacement instructions.



Fig 10


– Thanks to Christopher Crumb

New Charger Receptacles Now Available

Some 2011-2014 Volt and 2014 ELR models may have one or all of the following conditions:

• Vehicle will not charge the high voltage battery

• Current or history charging DTCs set, including DTCs P0D22, P0D26, P0D58, P0D59

• The vehicle will not shift out of Park


TIP: Before any repairs, follow the diagnostic procedures for any specific DTCs, ensure the charge cord is functioning properly, and verify that the issue is not a result of the charging infrastructure.


Inspect the Drive Motor Battery Charger Receptacle (Fig. 11) for micro cracking or water intrusion.


F11 Charge port door c

Fig 11


If an issue is found with the charger receptacle, a new, updated charger receptacle has been released to address the issues listed above. Replace the Drive Motor Battery Charger Receptacle (Fig. 12) with the correct part number for the vehicle being repaired.


F12 receptacle

Fig 12


– Thanks to Paul Radzwilowicz

Inoperative Remote Start

On some 2015 Escalade, Silverado, Suburban, Tahoe, Sierra and Yukon models; and 2014 Silverado 1500 and Sierra 1500, the remote start feature may be inoperative. In addition, if equipped, the power liftgate (RPO TB5) may be inoperative with the ignition off. If the ignition is turned on, the power liftgate will operate correctly. DTC P2537 (Ignition Accessory Switch Circuit Low Voltage) may be set.


These conditions may be caused by the ECM and/or TCM not receiving the 12-volt accessory wakeup signal from the BCM. Reference accessory wake up circuit 5985 in the wiring diagrams under Accessory Wakeup and Communications Enable in the appropriate Service Information. (Fig. 13)


F13 circuit 5985

Fig 13


Use a voltmeter to check circuit 5985 at the ECM and TCM. There should be approximately battery voltage present with the ignition on. After the ignition has been turned off, there may still be voltage present because the BCM may still be awake. This is normal. If no or low voltage is found, use the wiring diagram in the Service Information to perform normal circuit diagnosis.


TIP: Circuit 5985 is a low amperage signal circuit and it may not be able to power certain test lights or bulbs. The use of a voltmeter to test this circuit is required.


– Thanks to Jim Will

Service Know-How

10214.08D – Emerging Issues

August 14, 2014


To view Emerging Issues seminars:

• Log in to

–   Select Resources, and then Video on Demand; or

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

Car Issues – Fix It Right the First Time


Screen Shot 2014-08-11 at 11.06.13 AM

Truck Issues – Fix It Right the First Time


Screen Shot 2014-08-11 at 11.05.04 AM

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