Newest Tsbs Released

jrrod2004 · January 14, 2008

Here is a batch of recent TSBs that were released:

Document ID# 2048420

Subject:EI07094 - Frotn Fascia Paint Concerns on Peeling and/or Scratches (Engineering Information) #07-08-62-004A - (01/10/2008)

Models:2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT

2007-2008 Chevrolet Avalanche, Suburban, Tahoe

2007-2008 GMC Yukon, Yukon Denali, Yukon Denali XL, Yukon XL

Attention: Proceed with this bulletin ONLY if the customer has commented about this concern AND the EI number is listed in GMVIS, otherwise disregard the bulletin and proceed with diagnostics found in the published service information. THIS IS NOT A RECALL. Refer to Service Bulletin 04-00-89-053A for more detail on the use of engineering information bulletins.

This bulletin is being revised to add the 2008 model year. Please discard Corporate Bulletin Number 07-08-62-004 (Section 08 -- Body & Accessories).

Condition

Some customers may comment on front fascia paint concerns on peeling and/or scratches.

What Action to Take

GM Engineering is attempting to determine the root cause of the above condition. GM Engineering has a need to obtain information first hand during diagnosis and BEFORE repair. As a result, this information will be used by engineering to "root cause" the customer’s concern and develop/validate a field fix.

Instructions

If a vehicle is encountered with the above concern, please do the following steps:

<LI type=1>Record the VIN. <LI type=1>Record the vehicle build date. <LI type=1>Record the mileage at the time of service. <LI type=1>Record the vehicle paint code and color. <LI type=1>Photograph the paint concern. <LI type=1>E-mail the pictures to [email protected]
Contact Wayne Witkop at the GM Exterior Group prior to performing any paint repair to the front fascia.

Engineer Contact Information

Contact Engineer Wayne Witkop at 586-492-9096, and E-mail pictures to [email protected] before repairing the vehicle. GM Engineering may visit dealerships that are near Detroit, Michigan. In either case you will receive a response back within 2 hours on what action to take the same day of your call (Eastern Daylight Time).

If you do not receive a response from engineering, then proceed to repair the vehicle.

Parts Information

If necessary, GM may make arrangements to have the old fascia shipped to the Warranty Parts Center (WPC) based upon the information provided.

Important: Do NOT ship any parts to the WPC without a WPC request having been issued. WPC Requests will be sent for any parts that engineering wants to have returned.

Warranty Information

For vehicles repaired under engineering direction, choose the appropriate labor operation that best describes the repair:

Labor Operation

Description

Labor Time

A9915*

Fascia, Front Bumper-Color/Clear Coat-One Piece

2.3 hrs

A9914*

Fascia, Front Bumper-Refinish/Clear Coat-One Piece

3.2 hrs

B9821*

Fascia, Front Bumper-One Piece - Replace

1.2 hrs

*This labor operation number is for bulletin use only. This labor operation will not be published in the Labor Time Guide.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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Document ID# 2048420

Document ID# 2048424

Subject:New Tool Availability - EN-48974 - EGR Cooler Pressure Tester Adapter Set to Diagnose Duramax Diesel Engine EGR Cooler Leaks into Combustion Chamber #08-06-04-003 - (01/10/2008)

Models:2002-2008 Chevrolet Silverado

2002-2008 GMC Sierra

2004-2008 Chevrolet Kodiak C4500-C5500 Series

2004-2008 GMC TopKick C4500-C5500 Series

2006-2008 Chevrolet Express Vans

2006-2008 GMC Savana Vans

with 6.6L Duramax® Diesel Engine (VINs 1, 2, D, 6 -- RPOs LB7 (CA Emissions), LLY, LBZ, LMM)

An EGR Cooler Pressure Tester Adapter Set, EN-48974, was shipped essential to dealers in December 2007 to diagnose EGR cooler leaks on all Duramax engines equipped with an EGR system. This adapter set is designed to be used with J-46091-1 - Charge Air Cooler Tester Regulator to pressurize the EGR cooler with shop air and monitor for leakage.

Important: Leaks from the EGR cooler may allow coolant to pass through the exhaust system and enter the combustion chambers on the right bank cylinders. Failure to inspect the EGR cooler for leaks may lead to a misdiagnosis for coolant in the combustion chamber.

EN-48974 -- EGR Cooler Pressure Tester Adapter Set

<LI type=1>544259 (2 Qty) 19 mm (3/4 Inch) Hose Clamps <LI type=1>EN-48974-3 (Qty 1) 19 mm (3/4 Inch) EGR Cooler Hose Adapter <LI type=1>EN-48974-4 (Qty 1) 19 mm (3/4 Inch) Cap Plug <LI type=1>544258 (2 Qty) 15.9 mm (5/8 Inch) Hose Clamps <LI type=1>EN-48974-1 (Qty 1) 15.9 mm (5/8 Inch) EGR Cooler Hose Adapter
EN-48974-2 (Qty 1) 15.9 mm (5/8 Inch) Cap Plug

If an investigation of loss of coolant leads to coolant found in one or multiple cylinders on the right bank, test the EGR cooler for leakage before attempting any repairs. The cylinders affected will depend on which exhaust valves are open at the time of engine shutdown.

<LI type=1>Partially drain the engine coolant to allow EGR cooler hose removal. <LI type=1>Install the end cap and clamp of EN-48974 - EGR Cooler Pressure Tester Adapter Set to one of the EGR cooler hose barbs and install the pressure tester adapter hose and clamp to the other EGR cooler hose barb. Important: SOME J-46091-1 REGULATORS MAY BE PRESET AT 30 PSI WITH THE ADJUSTING KNOB RIVETED IN PLACE. THE RIVET HEAD MUST BE DRILLED OUT WITH A 5/16" DRILL BIT BEFORE ADJUSTMENT. DO NOT DRILL MORE THAN 1/8" IN DEPTH, OR JUST ENOUGH TO REMOVE THE RIVET HEAD. THE RIVET SHAFT DOES NOT HAVE TO BE REMOVED FROM THE REGULATOR.

<LI type=1>Back off the regulator on J-46091-1 - Charge Air Cooler Tester Regulator by turning counterclockwise until it stops. <LI type=1>Connect J-46091-1 - Charge Air Cooler Tester Regulator to EN-48974 - EGR Cooler Pressure Tester Adapter Set, and connect shop air to J-46091-1. <LI type=1>Open the shutoff valve, then slowly turn the regulator on J-46091-1 clockwise until the gauge reads 15 psi.
Shut off the valve on J-46091-1 and monitor the gauge for leak down. Replace the EGR cooler if it does not hold pressure.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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Document ID# 2048424

Document ID# 2048602

Subject:4 Wheel Drive Inoperative Front Axle Will Not Engage - keywords clunk grind growl k2 k3 #PIP4303A - (01/11/2008)

Models:2007-2008 Chevrolet Silverado, Silverado Classic

2007-2008 GMC Sierra, Sierra Classic

Equipped With a 9.25 Front Differential

This PI was Superceded to update Recommendation/Instructions. Please discard PIP4303.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

Customer may comment on 4x4 being inoperative stating that the transfer case will shift but the front axle will not pull. Technicians may find the front axle shift collar broken.

Recommendation/Instructions:

Engineering is conducting a investigation and at this time needs your assistance in gathering more information into the circumstances that may have led to the above condition. Please fill out the below questionnaire and contact GM technical assistance at the number you have been provided.

<LI type=1>Have the torsion bars been adjusted? <LI type=1>What was the approximate frequency of 4WD engagement? Once a day? Once a month? <LI type=1>Was there an audible noise at the time of the failure? <LI type=1>Under what condition did the 4WD fail? A. Was it already engaged when failure occurred?

1. Did failure occur at higher speeds/ on highway?

2. Did failure occur at low speeds / mud, snow?

B. Did it fail during engagement?

1. Failure during attempted higher speed engagement?

2. Failure during low speed engagement / mud, snow?

<LI type=1>Was the customer towing, hauling a load or was a snow plow attached?
Is there anything else about the vehicle or the circumstances of the axle failure that may be useful to an engineering investigation?

Engineering is still investigating the cause of the broken shift collar. It is not considered to be the result of abuse, and should be repaired under warranty. At this time repair or replace the axle in the most cost effective way. This PI will be updated after the investigation is completed.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

Document ID# 2048602

Document ID# 2048471

Subject:TCC Surge Or Chuggle - keywords 4T45E MN5 PWM shudder solenoid TCC TCM transaxle #PIP4314B - (01/11/2008)

Models:2007-2008 Chevrolet Cobalt

2007-2008 Pontiac G5

equipped with a 4T45E transaxle

This PI was superseded to add revision to contact engineering for vehicles close to Detroit or Windsor. Please discard PIP4314A.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

The above mentioned vehicles may have a concern of a TCC surge or chuggle.

Recommendation/Instructions:

For dealers within a 100 mile radius of Detroit or 160km of Windsor:

Contact Bob Martin (Cell 248-672-9111) after confirming the condition but PRIOR to any repair attempts. A TCM snapshot can be emailed to [email protected]. Engineers are interested in any 2007 or 2008 Chev Cobalt or Pontiac G5 with this highway surge conditon, and NO DTC's

All other dealers:

Reset the transmission adapts and retest. If this corrects corrects the concern advise customer engineering is aware of the concern and is working on it. Release the vehicle to the customer advising them that if the concern reoccurs to return to the dealer. If the vehicle returns use the contact information above to obtain further instructions.

If resetting the transmission adapts does not correct the concern perform the following. Before disassembling the transmission to correct the concern, swap a TCM from a known good vehicle and retest.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

Document ID# 2048471