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TOPIC : GMC

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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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Diesel with DEF in Fuel

This bulletin applies to 2010 – 2014 GM vehicles equipped with the 6.6L Duramax diesel engine, including Chevy Express and Silverado and GMC Savana and Sierra models. A technician may encounter a hard start, no start, rough running, low fuel pressure and/or DTC P0087, P0088, P0191 and P128E.

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PVC Oil Pullover

This bulletin applies to 2012-2013 Cadillac Escalades, Escalade ESV and Escalade EXT, in addition to Chevy Avalanche, Express, Silverado 1500, Suburban and Tahoe, and GMC Savana, Sierra 1500, Sierra Denali and Yukon.

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Too Lazy to Hold the Key Until Starting?

This bulletin applies to 2007-2013 GMC Sierra and Yukon vehicles. These vehicles are equipped with a computer-controlled cranking system (bump start). If the ignition switch is turned to the start position, and then released when the engine begins to crank, the engine will continue to crank for a few seconds or until the engine starts. Some customers may note that this feature is inoperative.

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