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| Note: Click a picture or illustration in the left column to view a large version in the article. To hide the large version, simply click on it. |
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TIS 2 Web Now the Primary Method to Update Tech 2 and Reprogram |
In early June, GMSO completed the migration of TIS 2 Web SPS to all U.S. dealers. Today, dealers will use TIS 2 Web as the primary method to update the Tech 2 and to perform vehicle reprogramming (SPS). | |
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Low Coolant Light On |
This condition may affect Century, Regal, Lumina, Impala, Monte Carlo, Grand Prix and Intrigue built between 2000 and 2002. - Thanks to Ian Doran |
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Discolored Brush Guard
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Owners of some 2003-07 Hummer H2 vehicles may comment about a discoloration or stain on their H2 Accessories Chrome Brush Grille Guard (p/n 17801174), particularly at the welds and drain hole locations (fig. 4). These stains are a result of residual fluid that has not fully escaped during the chroming process and may appear well after the product has been installed onto a customer’s vehicle.
H2 Accessories Chrome Brush Grille Guards that have this condition should not be replaced under warranty. GM recommends the use of a standard chrome cleaner. The supplier of this product is working to reduce or eliminate the potential for this to occur. - Thanks to Paul Radzwilowicz |
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On the 2005-06 Chevrolet Cobalt and Pontiac Pursuit (Canada only), some customers may comment that the fabric on the door trim is pulling away from the pull cup. This can affect vehicles both with and without power windows/locks. |
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| This information applies to the 2007 Cadillac Escalade, Chevrolet Tahoe and Suburban, and GMC Yukon and Denali. Some customers may experience a no-crank condition at times. This concern may be more likely to appear in colder weather. During diagnosis, there may be no communication with any module on the GM High Speed LAN, or multiple GM High Speed LAN loss-of-communication codes. The GM High Speed LAN terminating resistor may be shorting out and pulling down the GM High Speed LAN data line. Remove the terminating resistor and swap it with one from a known good vehicle and re-test the vehicle. If the condition goes away, replace the terminating resistor. TIP: To find intermittent concerns with the terminating resistor, place it in a freezer for 1 hour. Then check the resistance of the terminating resistor. It should be approximately 121 ohms. - Thanks to Paul Radzwilowicz |
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| Accessory Power Outlet |
The accessory power outlet (APO) on some Cadillac CTS cars may be set to remain “hot” at all times, or it may be set to remain on after the ignition is turned off, then shuts off after 10 minutes. Some owners may prefer the always hot setting, in order to charge cell phones or other accessories when the vehicle is parked. Other owners may prefer the shut off feature. There have been running changes to the CTS, and the owner manual has not clearly reflected some of these changes. (The owner manual was changed for MY 2006.) If an owner needs help in understanding the APO operation, here is a summary of the facts. Refer to bulletin 03-08-47-001B (SI document 1633586) for details. Timeout Feature The CTS was originally launched in January 2002 with the APO and cigar lighter timing out at 10 minutes as the default. By moving fuse(s) from one cavity to another in the Underhood Electrical Center, the APO (and/or cigar lighter) would remain hot at all times. The default and relay orientation was changed to hot at all times during the first model year, based on customer feedback. No Timeout Feature In October 2003 (2004 model year), the time out feature was eliminated as a reconfigurable option from the CTS. On 2004 and later CTS models, the APO and cigar lighter must remain hot at all times due to wire and circuit changes at the Underhood Electrical Center. TIP: There may be some confusion because on Cadillac SRX, the timeout feature can still be accomplished by adding a relay to the Underhood Electrical Center. This cannot be done on the CTS. - Thanks to Brian Combs and Steve Apking |
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TAC Case Closing Recognition Program
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High-quality TAC case closings are critical to building an accurate database that supports all GM TAC users. A TAC case closing recognition program for GM dealership service personnel started May 1, 2006 and will recognize two dealership service department employees per region each month for the next four months, ending August 31, 2006. The recognition is for all dealers, including Saturn and Saab. Each month, two $100 awards will be provided to dealership service personnel in each region, for a total of ten $100 awards each month, based on the following criteria: - Clarity and detail of the case closing submission - Technical value of the case closing submission - Could the case closing submission help fix another vehicle with the same concern? The person who submitted the selected TAC case closing will be awarded a $100 gift credit to their GM Superstore account. An account will be created for those who don’t have one, including those at Saturn and Saab dealerships. Dealer service managers for the winning submissions will be contacted by a TAC representative to verify the following: - Employee name of who submitted the case closing - If individual is still employed at the dealership - Individual’s position at the dealer, and other required information Once verification has been made, The Mark of Excellence - Service Program Headquarters will process the $100 GM Superstore credit: - A letter of notification will be sent to each winner at the dealership’s address with the details of the award gift and use - Program Headquarters will field questions related to the credit and redemption of the GM Superstore dollars - A GM Superstore account will be created for winners without one TAC is interested in receiving high quality case closing information. When you provide accurate and detailed case closing information, you are providing a quality case closing which is critical to the life cycle of the TAC Case. Contrary to popular belief, short and simple is not always the best. First example: Vehicle condition -- left front window inoperative Repair -- replaced the driver’s door module A short and clear explanation is fine. Second example: Vehicle condition -- left front window inoperative Repair -- repaired chafed wire Repairing a chafed wire doesn’t tell TAC or a fellow technician what was really repaired. A better explanation of the repair would be: Repaired brown wire circuit 1232, chafed on the park brake pedal bracket. REMEMBER: The quality TAC case closing that you provide today may help a fellow technician tomorrow, and the case closing your fellow technician provides next week may help you next month. Primary Contacts for Program: GM TAC Karen Raab karen.d.raab@gm.com 810.835.9000 Mark Gordon mark.a.gordon@gm.com 810.835.9012 Bill Szelag bill.szelag@gm.com 810.835.9080 GM Dealer Recognition and Event Team Rewards Supplier - ITA Group www.gmrewards.net 800.376.1699 Shaun Lacher shaun.lacher@gm.com 313.667.9350 - Thanks to Bill Szelag |
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EGR Kit Installation |
This information applies to 2005-06 Chevrolet Equinox and Pontiac Torrent with VIN F (RPO LNJ) engine. |
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Headphone Damage figure 5  figure 6 |
This information applies to 2007 fullsize utililties with Rear Seat Entertainment (RSE). Damage may result if the headphone is improperly stored in the seat pocket on the rear of the driver or front passenger seat (fig. 5). If the second row seat is folded forward manually or with power seats, the seat may contact the headphone, deforming or breaking the headband (fig. 6). The recommended storage location for the headphones is in the center floor console. - Thanks to Katul Patel and Paul Radzwilowicz |
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| Diesel Engine Overheating |
IMPORTANT: You must get authorization from your AVM before calling TAC for the internal PI. See step four below. Owners of some 2004-05 Chevrolet Silverado and GMC Sierra trucks may comment that the engine coolant hot indicator comes on, or the engine overheats. This concern occurs when towing a heavy load and ambient temperatures are high. The first Driver Information Center indicator is the ENGINE COOLANT HOT INDICATOR and comes on at 121°C (250° F). If the engine temperature continues to increase, the ENGINE OVERHEATED INDICATOR comes on at 124°C (255°F). PIP3574A contains updated information on a repair procedure for overheating in high ambient temperatures. 1. An ongoing investigation on 2004-2005 6.6 LLY diesel engines has determined that there are many factors that may lead to overheating. TIP: All of the information in step three of the PI must be inspected and completed. 2. If the vehicle was built between start of production in 2004 and March 2005, verify that the ECM has been programmed with the newest software. The TIS software title is "new calibration to reduce the potential for the engine coolant hot temperature telltale coming on prematurely." 3. If the customer still has a concern of one or both of the overheat indicators coming on in high ambient temperatures, please document and complete all of diagnostics listed below. A. Check for changes to the air intake areas or for aftermarket grille accessories. Make sure all air dams are in place and not modified. Remove any aftermarket grilles or accessories that may restrict air flow. B. Visually inspect the Charge Air Cooler (CAC) to insure that it is not plugged externally. Use J 46091 to insure that all pipe connections are properly sealed and the CAC does not have a leak. C. Monitor fan clutch operation and complete SI diagnostics for Fan Clutch Diagnosis. D. Monitor the actual and desired turbo vane positions to verify that the turbocharger is performing properly. E. Check the transmission oil level. An over-filled transmission can add to heat levels in the cooling system. F. Check the air induction system. Insure that the filter is in good condition and is properly installed. G. Obtain a weight slip that shows the gross vehicle weight of the vehicle/trailer if the overheat occurs only while towing. H. Document ambient temperatures in the area when the overheating concern occurs. 4. If all diagnostics have been completed, and a condition of overheat has been verified, call the General Motors Technical Assistance Center to discuss repair procedures. This repair procedure must be authorized by the dealer’s Area Service Manager (AVM). 5. If this overheat repair is completed, and the vehicle still overheats, call to update the GMTAC case, and do a Field Product Report using bulletin 02-00-89-002D. - Thanks to Dan Oden |
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On the Pontiac G6, incorrect placement of the hoist pads to the underbody pick-up areas may cause a crack or leak in the plastic EVAP canister and eventually set one or both of the following DTCs:
To avoid this situation, particularly when using the type of hoist where the arms swing in and the pick-up pads swivel, be sure the pick-up pads are positioned correctly (fig. 7). Refer to SI document 1211728.
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HVAC Operation During Remote Start |
This describes the operation of the HVAC system on the 2006 Chevrolet Impala and Monte Carlo during a remote vehicle start event. |
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Proper Addition of Oil to Replacement LS7 Engine
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Replacement engines available from SPO do not contain engine oil. The engine replacement procedure for the LS7 engine used in the Z06 Corvette requires proper addition of oil for engine lubrication before starting the engine. A Dry sump oil tank If an engine is being repaired or replaced due to a mechanical engine failure that deposited debris into the engine, clean the following components of debris before starting the engine: |
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Theft Deterrent/Immobilizer System/Pass Key 3+ |
These tips apply to 2006 Chevrolet Impala and Monte Carlo, Cadillac DTS, and Buick Lucerne; 2007 Chevrolet Tahoe, GMC Envoy, Cadillac Escalade and SRX. Pass Key 3+ Systems use a key with a circle around a plus mark, on the shank of the key.  The 30 minute key learn procedure is valid only when replacing lost keys. Theft enable now inhibits engine crank. If the theft light is on with a no crank, look for a DTC and follow the appropriate diagnostic. For 2007, SI now refers to the Vehicle Theft Deterrent system as the Immobilizer. Content Theft remains under the Theft Deterrent section. - Thanks to Gary Hazen |
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Stabilitrak Disable Message |
This information applies to the 2002-06 Cadillac Escalade, Chevrolet Avalanche, Suburban, Tahoe, GMC Yukon and Denali with RPO JL4. Some customers may comment on one or more of the following concerns: - Stability System Disabled message displayed on the Driver Information Center (DIC) - unwanted Stabilitrak activation - vehicle lighting systems may dim noticeably - VSES motor may come on unexpectedly Check for excessive wear on the tires on the vehicle and verify that all the tires are the same size, brand, and model. The following examples could cause any of the conditions listed above. - two tires on the vehicle are brand new and the other two tires have excessive wear - tires are same size, different brands (i.e., two tires on the vehicle are Goodyear P245/75/16 and the other two tires are Firestone P245/75/16) - tires are same brand and size, different models (i.e., two tires on the vehicle are Goodyear Wrangler SRA 265/70R17 and two tires are Goodyear Wrangler HP 265/70R17) - Aftermarket wheels and tires (non-OEM 20 inch wheels with sand tires) - Thanks to Jim Will |
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Owners of some 2007 Cadillac Escalade, Chevrolet Avalanche, Suburban, Tahoe and Yukon and Yukon Denali models may comment that a whistle noise is heard when the HVAC blower is on high speed. Place a piece of foam 1/2-inch thick by 3/4-inch x 3/4-inch (13 mm thick by 19 mm x 19 mm) at the front door handle locator pin. Place the foam over the locator pin and push the foam onto the pin so that it pierces through the foam (fig. 11). Lay the handle gasket back down and reinstall the door handle (fig. 12). - Thanks to Jim Will |
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Adjustable Pedals Inoperative |
This information applies to the 2007 Chevrolet Suburban, Tahoe and GMC Yukon, Yukon XL, without AN3. |
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Instrument Panel Carrier Rattle |
This information applies to the 2007 Cadillac Escalade, Chevrolet Tahoe and Suburban, and GMC Yukon and Denali. |
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This information applies to 2006 Cadillac Escalade, Chevrolet Avalanche, Silverado, Suburban, Tahoe, and 2006 GMC Sierra, Yukon. Repair the shorted circuit as necessary and reroute harness so the knee bolster deflector does not pinch the harness during reassembly. |
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Liftgate Creak Noise |
This information applies to the Buick Rainier, Chevrolet TrailBlazer, GMC Envoy, Oldsmobile Bravada, and Saab 97x between 2004 and 2006. |
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Rear Doors Won’t Unlock |
This information applies to the 2007 Cadillac Escalade, Chevrolet Tahoe and Suburban, and GMC Yukon and Denali. |
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Waxing New Vehicles |
Current GM vehicles are painted with a two component urethane clear coat. This finish cures during the manufacturing process. |
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Truck Issues — Fix It Right the
First Time
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Know-How Broadcasts for August
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