GMC Complaints

2 days after the delearship changed my oil to a heavier weight, my engine began knocking. I’m told the rod is bent but not covered by warranty

The contact owns a 2018 GMC Canyon. The contact stated that while driving in the snow, the 4WD function became inoperable, and the vehicle lost traction and started skidding. The "Service 4WD" message was displayed. The vehicle was taken to a dealer where it was determined that a chip inside of the casing of the 4WD feature was inoperable. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 40,000.

I am writing to report a failure of the telematics module in our vehicle. The module stopped functioning without any warning or notification on the dashboard. Our vehicle has only 64,000 miles and has never been involved in an accident, so this failure is unexpected. This issue has resulted in the complete loss of OnStar connectivity, meaning that automatic crash notification would not occur in the event of an accident. Additionally, we are no longer able to remotely unlock or access the vehicle through the app, as all communication capabilities are currently disabled.

SUVs check engine light turned on and went into reduced power mode, it has been very cold for approximately a month. Code P0299.

2018 GMC Acadia comes up with an error message "shift to park" and does not allow me to fully engage my car into the parked position when stopped and parking.

Vehicle will show lane keep assist system as active but provide no intervention and allow vehicle to travel into the next lane intermittently. System will also move itself to the next lane unexpectedly when near the lane markers of the original lane. Navigation system and radio will freeze, stop working all together, and at times fully reboot, randomly while in operation. While these issues are frequent, they are intermittent. No repair suggestions by dealer or manufacturer

Engine losing 60% to 50% of its oil capacity at 5000-6000 miles with 40-50% life left in the vehicles built in maintenance minder. This has been a trend since 25,000 miles. By this math, vehicle would have minimal oil, if any at all, when vehicle says service is due. Creates a high probability for catastrophic failure at speed and increases smoke / condensation from the exhaust in colder weather. Dealer states this is a common problem, manufacture has adjusted their oil consumption standards to make this a "normal" amount despite the risk of failure and injury at speed.

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed and hauling a boat, the vehicle shook violently and made a loud banging sound. The vehicle failed to accelerate above 40 MPH. The check engine warning light was illuminated. The vehicle was towed to the dealer, and it was determined that there was a misfire in cylinder #6, and that the engine required further inspection. The vehicle was not repaired. The contact related the failure to NHTSA Action Number: EA25007 (Engine, Engine and Engine Cooling). The manufacturer was not made aware of the failure. The failure mileage was approximately 87,000.

Engine shut off on the interstate with no warning. Would not re-start. Forced to cross lanes on traffic with no engine power or power steering. Dealer stated it was the "Fuel Pump Control Module." Stated it was a common issue with parts most likely in stock, but it would be at least 6 weeks before they could even look at the vehicle.

The contact owns a 2003 GMC Envoy. The contact stated that while the vehicle was parked on several occasions, there was condensation under the front of the vehicle. The vehicle was taken to a dealer on several occasions, where it was determined that the differential needed to be repaired due to a leak coming from the axle. On several occasions, it was determined that the rear pinion seal needed to be replaced. The contact stated that the rear pinion seal was replaced on several occasions. The manufacturer was notified of the failure. The failure mileage was approximately 66,411.