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TOPIC : GMC

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Cranky Truck

This bulletin applies to 2012 GMC Sierra 4WD trucks. You may experience a vehicle that has a P0633 set in the ECM. Also, you will not be able to clear the DTC. Code P0633 will set as an indicator that the ECM is in learn mode and not as a fault indicator.

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Not a Cool Chevy

This bulletin applies to 2012-2013 Chevy Equinox and Impala vehicles as well as GMC Terrain models, equipped with a V6 engine only. Some customers may comment on an erratic or insufficient cooling when the A/C compressor is turned on. The compressor may not have been torqued properly at the time of assembly, causing a load on the compressor shaft.

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Coolant in Spark Plug Tube

This bulletin applies to GM vehicles equipped with HFV6 engines (3.0L and 3.6L LF1, LFW, LLT and LFX). Affected vehicles include 2010-2014 Buick Enclave and LaCrosse, Cadillac ATS, CTS, SRX and XTS, Chevy Camaro, Caprice, Equinox, Impala and Traverse and GMC Acadia and Terrain.

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Brake Light’s Always On

This bulletin applies to a host of 2010-2014 GM vehicles (Chevy, Buick, Cadillac, GMC). A customer may comment that the vehicle brake lights remain on with the vehicle off and the battery going dead while parked.

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DTC B0081 Diagnosis

This bulletin applies to 2009-2013 Chevy Avalanche, Silverado, Suburban and Tahoe and GMC Sierra and Yukon models. DTC B0081 can be set in the SDM (sensing diagnostic module) and PPS (passenger presence system).

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Fancy Seat Failure

Some owners of 2012 GMC Acadia AWD trucks may comment that the front and/or rear heated seats are inoperative and/or the driver’s power seat only moves in short bursts each time the switch is operated.

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GM Power Steering Leaks

Some customers may comment on a fluid leak under the front of the GM vehicle. The technician may find fluid leaking from the power steering system.

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Chevy Communication Breakdown

This bulletin applies to 2010-2011 Chevy Equinox and GMC Terrain vehicles, where dash messages “Intermittent Service Stability, Service Traction and Service All Wheel Drive” messages are found. Stored DTCs can include C0186, C0196, C0710, U0125, U0126, U1826 and U1827.

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GM Chirp, Squeak, Squeal or Tick

Customers may complain of a SES light, misfire, DTC P0300, and/or a chirp, squeak, squeal or tick noise -- which may mean a potential valvetrain concern.

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GMC Wire Chafing

This bulletin addresses concerns for rough running, surging and misfires on 2004-2005 GMC Silverado, Sierra, Kodiak and Topkick vehicles equipped with a 6.6L engine.

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