Archive for June 2014

New GDS 2 Functionality

Several new GDS 2 functions have been introduced to make it easier for technicians to navigate through GDS 2 and communicate more effectively. Look for these new functions in the recent June 9 software update release.


Selected Vehicle Panel


A new navigation panel has been added to the right side of the GDS 2 screen that shows the selected vehicle (vehicle navigation path). (Fig. 1) This panel shows the model year, make, model and VIN digits 1–3.


F01 gds2 selectedvehicle

Fig 1


Email Button


In the Edit Session File Selection where users can review stored data from the GDS 2 main screen, a new Email button is available. (Fig. 2) From the stored data, select the Edit button and then select a session file to activate the Email function. Technicians can send session and other log files directly to an email specified by the user.


F02 gds2 emailbutton

Fig 2


In the Email screen, an Email address must be added manually. The Subject name is created according to the selected session name. Attachments are added to one zip file and renamed Attachments.piz. (Fig. 3) Error logs are automatically added.


F03 gds2 emailscreen

Fig 3


New Tabbing Function


To more easily navigate through GDS 2, use the Tab, Shift + Tab, Alt + Tab, Enter, Up Arrow, and Down Arrow keys on the keyboard. (Fig. 4) The keyboard tabbing functions provides faster access and navigation to various components. The selected components are identified by dashed lines or blue borders around the selection or a slight coloration.


F04 gds2 tab

Fig 4


– Thanks to Chris Henley

Proper Programming of Next Gen Instrument Clusters

The failure to properly program Next Generation instrument clusters, currently found on 2013-2015 ATS, SRX, XTS; 2014 Silverado 1500, Sierra 1500; 2014-2015 CTS Sedan, ELR, Corvette, Impala, LaCrosse, Regal; and 2015 Escalade, Silverado, Tahoe, Suburban, Sierra, and Yukon models, can result in a “locked up” condition, which may result in the clusters being replaced unnecessarily and customer dissatisfaction. Not all incomplete programming results in a “locked up” condition. It is critical that an event is programmed correctly each time.


An incomplete programming procedure is defined as not completing all the steps listed in the Service Information that are required to install new or existing software on a vehicle. An example of the proper steps can be taken from the 2014 XTS programming procedures. (Fig. 5) The USB configuration, Programming, and Setup and Configuration procedures must be performed every time an update is completed.



Fig 5


Since the programming procedures vary based on the vehicle platform, the Service Information should be referenced every time. For example, the 2014 Silverado has a sequenced Programming and Setup and Configuration procedure that calls for the USB programming to be performed last. (Fig. 6)


F06 IPC K2

Fig 6


TIP: In SPS, an instrument cluster will have P16 labeled next to each of its procedural steps required for a software update. (Fig. 7)

During programming, it is highly recommended to use a wired MDI connection to update the instrument cluster.

 F07 IPC P16

Fig 7


– Thanks to Aaron Motyl

Updated Rear Wheel Bearing and Hub/Spindle Replacement Procedure

When replacing the rear wheel bearing and hub/spindle on 2011-2014 Caprice PPV; 2014 Chevrolet SS; and 2008-2009 Pontiac G8 models, the proper tools must be used as outlined in the appropriate Service Information.


To press out the axle, use the wheel nuts to attach tool J-42129 and remove the spindle. (Fig. 8)


F08 tool

Fig 8


To remove the spindle from the rear wheel bearing, use a hammer and punch tool DT-51438. (Fig. 9)

 F09 punch

Fig 9


TIP: The wheel bearing must be replaced every time the wheel hub is removed. It will be damaged when pressing out the wheel hub flange.


– Thanks to Brad Thacher

Trailering Package and Towing Capacity

The trailer towing capacity of 2009-2014 Traverse, 2008-2014 Enclave, 2007-2014 Acadia, and 2007-2010 Saturn Outlook models is 2,000 lbs. (907 kg) when not equipped with the trailering package (RPO V92). With the trailering package, the towing capacity ranges from 4,500 lbs. (2,041 kg) to 5,200 lbs. (2,359 kg), depending on model and equipment. See published literature for the specific towing capacity on specific models.


Customers may ask how to increase the towing capacity of a vehicle without the V92 trailering package. The trailering package includes the hitch, 7-wire connector, trailer brake jumper harness, heavy-duty radiator, Tow/Haul Mode (Fig. 10) for the transmission and unique powertrain calibrations for sufficient cooling capacity and transmission durability. While some of this content could be retrofitted to upgrade a vehicle to match the capabilities of the V92 trailering package, it is not recommended because of the inability to retrofit the Tow/Haul Mode feature and unique powertrain calibrations.


2015 GMC Acadia

Fig 10


All vehicles without the V92 trailering package should be considered to have a 2,000 lb. (907 kg) towing capacity, regardless of any attempts to increase towing capacity by modifying the vehicle.


– Thanks to Gary McAdam

Exhaust Rattle Noise

On some 2010-2014 Camaros, a rattle noise may be heard coming from the exhaust system. It may sound like the noise originates from the transmission area.


If a noise condition is being addressed from underneath the vehicle, first strike the exhaust system with a rubber mallet or a deadblow hammer. If a noise is heard, inspect where the two front exhaust band clamps join the front catalytic converter assembly to the rest of the exhaust system. (Fig. 11)


F11 3829007

Fig 11


This joint is called a Torca coupling. In this coupling, a small alignment tab is welded onto the exhaust pipe. A band clamp is positioned around the joint and slid toward the rear of the vehicle until a notch in the band clamp is positioned around the alignment tab. This ensures that the clamp is properly positioned on the exhaust before it is tightened. With this clamp in position, a J-shaped clip slides up and over the alignment tab to lock the clamp into position on the pipe. (Fig. 12)


F12 3829013

Fig 12


In some cases, a rattle noise may be heard coming from this coupling. The noise may be due to the J-shaped clip rattling against the exhaust pipe or from the alignment tab that was originally welded on the exhaust pipe becoming separated from the exhaust pipe.


If a noise has been confirmed from the coupling, inspect the exhaust system for any obvious damage or looseness in the related components. If nothing is found, bend the J-shaped clip away from the exhaust pipe. If the small alignment tab is found to be loose, completely remove it from the exhaust pipe. This can be accomplished with the use of a regular screwdriver. Make sure the J-shaped clip will no longer contact anything that may cause a rattle noise in the future. (Fig. 13)


F13 3829003

Fig 13


– Thanks to Matt Bierlein

UPDATE: Instrument Cluster Not Displaying Data, Steering Wheel Controls Inoperative

The enhanced 8-inch Instrument Panel Cluster (RPO UHS) on some 2014 Lacrosse models built before March 14, 2014 and 2014 Regal GS models built before April 22, 2014 may not display radio or phone data. (Fig. 14) An Audio Off message may be displayed on the Driver Information Center and the right audio steering wheel controls may be inoperative. In addition, the instrument cluster may intermittently display Sport mode and the Head-Up Display (HUD) may not retain the preferred settings when the ignition is turned off.

 F14 Regal DIC Radio

Fig 14


These instrument cluster conditions may be the result of a reset condition within the Instrument Panel Cluster.


New Instrument Panel Cluster software has been released to address these conditions. Use TIS2Web to update the Instrument Panel Cluster calibrations and confirm proper operation.


TIP: The updated software only applies —  vehicles must be equipped with the 8-inch cluster (RPO UHS) and built before the listed build dates — if audio is still present, the radio controls still function, and no current infotainment DTCs are set.


– Thanks to Christopher Crumb

Exhaust Heat Shield Noise

Some 2015 Escalade models, Suburban, Tahoe, and Yukon models may have a rattle or buzz noise coming from the rear of the vehicle. The noise may sound like it is coming from the roof area, headliner, luggage rack, 2nd-row seat, 3rd-row seat, and/or a buzz-type wind noise at higher speeds.


These conditions may be caused by the exhaust muffler heat shield mounting stud coming loose from the body. (Fig. 15, 16)


F15 3829053

Fig 15


F16 3829055

Fig 16


To correct this condition, replace the broken stud by installing an M6 rivet stud. Refer to the latest version of Bulletin #10-08-45-001.


TIP: Be sure to use a drill stop when drilling the hole for the M6 rivet stud.


– Thanks to Jim Will

2014 TechLink Reader Survey Extended

The 2014 TechLink Reader Survey has been extended until the end of June.


Let us know how we’re doing in bringing you the latest GM technical news and repair information. Click here or the Survey link on the right side of the home page to take a short survey about the information you want most in TechLink.


We typically cover a wide range of topics, from the latest diagnostic and technical repair information to Techline programming, new model features, special tools and more. We’d like to hear from technicians and other service department professionals about the types of repair information to cover and which new topics are of interest and value.


Your input will help in determining the coverage in future editions. Thanks for taking the time to complete the survey. We’ll share the results when the survey is complete.


But don’t wait! The survey will end June 30.


– Thanks to Lisa Scott

UPDATE: J-45059-A Angle Meter

Last month, TechLink covered the growing use of Torque Plus Angle to Yield (TAY) fasteners, or sometimes referred to as Torque To Yield (TTY) fasteners. To achieve the proper specification when tightening TAY fasteners, the J-45059 Angle Meter or J-45059-A Angle Meter (Fig. 1) should be used.


F01 meter front

Fig 1


The J-45059-A Angle Meter is designed for use with standard 3/8-inch or 1/2-inch square drive extensions, ratchets, or breaker bar handles (Fig. 2, A – attachment location), or for use with a 1/2-inch square drive “click” style torque wrench, approximately 1 inch to 1-1/4 inches (25 to 31 mm) in diameter. (Fig. 2, B – attachment location)


F02 meter1

Fig 2


When turned on, J-45059-A Angle Meter displays the last angle value entered. Press the power button to rotate the display 90 degrees clockwise; continue pressing the power button until the display orientation is in the desired position.


Use the up/down arrow buttons to set the desired angle value from 0-199 degrees.


When ready to measure angle, apply a slight force in the required direction of rotation to eliminate free-play in the socket, extension, and driver. Do not turn the bolt at this time.


With free-play eliminated, press the Start button, and the meter will display WAIT, followed by TURN. When TURN is displayed, the meter is zeroed. Turn the driver until the desired angle is reached. While the meter is turned, a yellow bar is displayed that gets longer as the set angle is neared. Within 5–10 degrees of the set angle, the end of the yellow bar will turn red, and the meter will beep and flash when the angle is reached.


The J-45059-A Angle Meter can be used on a ratchet handle when the fastener is in an area with limited access. To use this feature, after the meter is zeroed, and the ratchet is being turned, stop turning momentarily. The ratchet can be turned back, but the displayed angle will not change. At the end of the back-swing, stop momentarily again, and the meter will continue to increase the angle measured from this ratcheted point.


Click below for a closer look at the functions of the J-45059-A Angle Meter. (Fig. 3)


F03 meter video

Fig 3


The J-45059-A Angle Meter requires a AA battery. The J-45059 Angle Meter uses two #CR-2032 batteries. To replace the batteries, separate the front case from the back. The battery is located in a holder on the circuit board.


– Thanks to Tedd Magana

DTC Symptom Byte Documentation in Warranty Claims

When job cards are submitted for warranty claims on all 2011-2015 GM passenger cars and light-duty trucks, DTC symptom byte information is required.


When documenting DTC information, the DTC symptom byte needs to be included along with the module it was set in. Enter the DTC and symptom byte information in the Cause section of the GWM claim. For example: B0014 0D (the first four characters are the DTC and the last two are the symptom byte). In GDS 2, click the Details button on the DTC Display screen to view the DTCs and symptom bytes. (Fig. 4)


F04 dtc symptom byte

Fig 4


With the added technology within the vehicle, adding the symptom byte to the documentation helps to speed up the process and pinpoints the problem for the supplier and engineering when trying to determine the root cause of a vehicle condition.


For further information, refer to section – Details of Cause and Correction in the GM Service Policies and Procedures Manual. In Canada, see 1.6.2 c – Details of Customer Concern, Cause of Failure and Correction.


– Thanks to Gary McCraw

BCM Reprogramming for Unwanted Trunk Opening

On some 2014 Cruze models built prior to February 28, 2014 and 2014 Sonic sedan models built prior to March 30, 2014, the trunk may open intermittently while the vehicle is parked without pressing any of the release buttons. This condition may be caused by the trunk release button on the Remote Keyless Entry transmitter (key fob) (Fig. 5) being pressed inadvertently while the transmitter is in the customer’s pocket or purse.


F05 key fob

Fig 5


Although the trunk is unlatched while parked, the owner may not observe the trunk being open until the vehicle is driven. A Trunk Open message may be displayed in the Driver Information Center.


The unwanted trunk opening condition was addressed earlier by installing a two shot relay requiring that the key fob trunk release button be pressed twice to open the trunk. Now, for 2014 model year vehicles, reprogramming the Body Control Module (BCM) will provide a press and hold trunk release function on the key fob. Prior model year vehicles still require the two shot relay (refer to #PI0924B).


Press and Hold


To correct the unwanted trunk opening condition, reprogram the BCM with the latest calibrations available on TIS2Web. The new calibration will change the amount of time required to hold the trunk release button on the key fob from 200ms, which is instant open, to a 1 second hold in order to execute a trunk release event. Refer to the BCM Programming and Setup procedure in the appropriate Service Information for programming information.


Press Twice


If the two shot relay was previously installed (refer to #PI0924B) to address the unwanted trunk opening condition, the trunk will not open as expected after BCM reprogramming because it now takes two 1-second presses of the key fob to open the trunk. The rear compartment relay must be changed back to factory single press relay. This can be confirmed by investigating vehicle warranty history for labor operation 2680118.


After reprogramming the BCM for any reason, explain to customers that they now have the 1 second press and hold key fob function to open the trunk.


– Thanks to Steve Bruder

Door Striker Cover Installation

Installation of the front door and rear door striker covers is part of the Pre-Delivery Inspection (PDI) process for up-level 2015 Tahoe LTZ, Suburban LTZ, Yukon Denali and Escalade models. These covers are shipped with the vehicle from the assembly plant.


Be sure not to install the striker covers incorrectly or backwards. The covers are installed correctly if the rounded side of the cover is positioned toward the outboard side of the vehicle. (Fig. 6)


F06 striker cover

Fig 6


– Thanks to James Will

Passive Keyless Entry Diagnostic Tips

If one or more Passive Keyless Entry (RPO ATH) buttons, located on the outside door handles (Fig. 7), of some 2015 Suburban, Tahoe and Yukon models are not working or are intermittently working, there are several diagnostic tips to keep in mind.


F07 door button

Fig 7


• The Remote Keyless Entry transmitter (key fob) may not be properly located within the range of an antenna. The key fob needs to be within approximately one meter (approximately three feet) of the door handle where the passive entry button is being operated.


• The customer may not have completely pressed the door handle button. For example, pressing only the side of the button does not allow the switch to make contact and the system will not operate. In some cases, wearing gloves may contribute to this condition.


• In cold weather below 32°F (0° C), ice may form between the door handle and the button during car washes or thaw/freeze cycles. With this condition, the button or the bottom of the button may not move or only move slightly. The top of the button may move so it looks and feels as if the button is being pressed when it is not. Applying additional pressure and/or cycling the button multiple times will usually break up the ice and allow the system to operate normally.


• If the front door is fully open and the customer is trying to open the rear door, the rear door may not unlock and open because the key fob is out of range of the front door handle antenna. When the front door is fully opened, the antenna in the handle is far from the rear door and out of range. The unlock button on the key fob or door switch will need to be pressed to open the rear door(s).


• If a door handle switch is suspected to be defective, it can be component tested. Measure the resistance between the door handle switch circuits. With the button released, the resistance should be infinite. With the button pressed, the resistance should not exceed 15 ohms.

Do not replace the door handle for a condition that has not been duplicated unless switch resistance is outside of these specifications.


– Thanks to James Will


Wind Noise from Front of Vehicle

On the 2014 Camaro equipped with the RS Package (RPO WRS), a whistle or howl noise may be heard coming from the front of the vehicle while driving at speeds of 40–60 mph (64–96 km/h). It may be a difficult to narrow down the cause of the condition by taping off various body seams. The noise may be described as coming from the windshield area, but in most cases, it is not the source of the condition.


The whistle noise may be caused by wind rushing over the various gaps around the headlamp capsules of the vehicle, which may produce a higher pitched wind noise when the car is driven at speeds of 40 mph (64 km/h)  and greater. It may be difficult for some technicians to hear the noise. Depending on the direction and severity of the wind, as well as the direction and pitch of the vehicle, the noise may come and go completely or may simply change in volume.


To isolate the source of the noise, apply 2-inch (5 cm) wide masking tape along the upper edge of both headlamp assemblies. Make sure that the tape covers the gap between the headlamp capsules and the adjacent chrome trim directly above it. (Fig. 8) Test-drive the vehicle to confirm that the noise has been eliminated. Either headlamp may contribute to this noise.


F08 3806374

Fig 8


With an assistant, lift up slightly on the chrome trim above each headlamp assembly and run a bead of silicone between the headlamp capsule and the chrome trim above it. (Fig. 9) Release the chrome trim so it relaxes itself into the wet bead of silicone. Afterward, run a moist finger along this area and tool the bead so it is as smooth and inconspicuous as possible. Be sure to apply silicone to the entire horizontal length of both headlamp capsules.


F09 3806375

Fig 9


TIP: On lighter colored cars, use clear silicone. On black cars, a black colored silicone has been found to go unnoticed as well.


In some cases, the wind noise has been found to come from other areas surrounding the headlamp capsules.


If this procedure does not resolve the noise concern, call the GM Technical Assistance Center before making any additional repairs in this area of the vehicle.


– Thanks to Matt Bierlein

Pinched Instrument Panel Harness

Depending on vehicle options on some 2015 Escalade models, Silverado, Suburban, Tahoe, Sierra and Yukon models; and 2014 Silverado 1500 and Sierra 1500 models, any of the following conditions may be present:

• Remote Keyless Entry (RKE) inoperative

• Passive Entry and Passive Start inoperative

• No audio

• Touch screen inoperative

• Steering wheel controls inoperative

• BCM DTC B3101 (Keyless Entry Data Link Circuit)

• Radio and Human Machine Interface (HMI) DTC’s U0028 (MOST Bus) and U0029 (MOST Bus Performance)


These conditions may be caused by the instrument panel harness being pinched between the left I/P instrument panel mounting bracket and the body. (Fig. 10) In many cases, the complete harness is not pinched and it may not be apparent. When inspecting for a pinched harness, make sure the harness (Fig. 11, B) can be moved freely away from the bracket-to-body interface. (Fig. 11, A)


F10 3910938 R

Fig 10


F11 3910939 R

Fig 11


To repair this condition, loosen the left I/P instrument panel mounting bracket bolts and pull the harness free. Open the harness and repair any damaged wires as necessary.


– Thanks to Jim Will



Rear Quarter Glass Area Wind Noise

A wind whistle noise may be heard from the right or left rear quarter glass area on some 2015 Suburban, Tahoe and Yukon models when driving at highway speeds of 60 mph (96 km/h) and up. The noise may be more noticeable with a cross wind.


This condition may be caused by the fit of the exterior “D” pillar trim or the rear tail lamp assembly.


“D” Pillar Trim


Check the fit between the exterior “D” pillar trim and the rear quarter glass. (Fig. 12)


F12 3827986

Fig 12


Excessive urethane from the quarter glass installation may not allow the exterior “D” pillar trim to fit properly against the rear quarter glass, as shown below. (Fig. 13)


F13 3827994

Fig 13


Use a sharp knife to cut off the excessive urethane to allow the exterior “D” pillar trim to fit correctly against the rear quarter glass. (Fig. 14)


F14 3828000

Fig 14


Rear Tail Lamp Assembly


Inspect the fit between the rear tail lamp assembly and the quarter panel. (Fig. 15)


F15 3901934

Fig 15


Install a 5mm X 5mm (3/16-inch X 3/16-inch) piece of closed cell foam tape along the entire length of the tail lamp assembly. (Fig. 16)


F16 3910944

Fig 16


– Thanks to Jim Will


Service Know-How

10214.06D – Emerging Issues

June 12, 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 2014-06-05 at 10.37.14 AM

Truck Issues – Fix It Right the First Time

Screen Shot 2014-06-05 at 10.35.50 AM

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