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TOPIC : GMC

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Piston Damage

General Motors advises inspection for piston damage when the MIL is on and the engine misfires and displays a ticking/knocking noise. This may be caused by an aftermarket ECM calibration/component and detonation that leads to melted pistons.

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Might be the Water Pump

This bulletin applies to 2017-2019 GMC Canyon trucks equipped with a 3.6L engine. Some customers may comment that the SES lamp is on or the engine may have a slight noise coming from the front of the engine belt area. Upon investigation, you may find DTC P0324 set in the ECM.

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GM Recall

General Motors announced a recall of certain 2018 GMC Terrain, Acadia and Canyon vehicles built during March 2018.

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Check for Leaky Injectors

This bulletin applies to 2015-2018 GMC Yukon vehicles equipped with a 5.3L or 6.2L engine, and 2019 Savana vehicles equipped with a 4.3L engine. Some customers may comment about an underhood fuel odor and/or starting the engine sometimes requires extended cranking time.

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GMC ABS Noise

This bulletin involves 2010-2016 GMC Acadia and 2017 GMC Acadia Limited vehicles. Some customers may comment that there is a clunk/thump noise on acceleration once after each key cycle that may be mistaken as coming from the suspension or engine compartment.

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Trans Relearn

This bulletin applies to 2015 GMC Yukon and Sierra vehicles. Customers may comment about firm 1-2 upshifts, firm 3-1 downshifts, engine rpm flare on tip-in and the MIL on. The technician may find DTCs P0606, P16F3 or P2818 set as current or history.

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Chevy/GMC Codes

This bulletin applies to 2010 – 2017 Chevy Equinox and GMC Terrain vehicles. Any combination of the following DTCs may be present:

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Trans Trauma

Certain 2017 GMC Sierra, Yukon and Yukon XL vehicles equipped with an 8-speed automatic transmission may have a condition where a false failure action is being taken when it is not required. This condition can result in the transmission holding the last known safe gear for 6 seconds.

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GMC Mystery Noise

This bulletin applies to 2017 – 2018 GMC Sierra, 2019 Sierra Limited and 2017-2019 Yukon vehicles. Some customers may comment on a noise described as a tick, spark, knock, detonation or exhaust. The cause may be that the steering shaft seal (intermediate shaft seal) was incorrectly installed.

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Wheel Speed Sensor Woes

This bulletin applies to 2007-2017 GMC Acadia vehicles. In some cases, the ABS Service Traction Control System, and/or Service StabiliTrak telltale lights may be on. During initial scan for EBCM module diagnostic codes, you may find one or more of the following DTCs: C0035-C0050 with specific symptom bytes 18, 5A or 0F.

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