GMC Complaints

The contact owns a 2021 GMC Sierra. The contact stated that while driving at approximately 40-45, the engine warning light illuminated. There was an abnormal sound coming from the fan. The vehicle was taken to the local dealer, where it was diagnosed and determined that the coolant flow valve needed to be replaced. The vehicle was not included in a special coverage program. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was approximately 50,000.

The contact owns an Evenflo Car Seat, Model Type: Evenflo Gold Revolve360 Extend, Manufactured Date: January 14, 2025, installed in a 2017 GMC Acadia. The contact stated that the 360-degree rotating car seat failed to lock securely into position while the child was seated in the car seat. While attempting to position the car seat in the forward-facing setting, the rotational shell failed to engage or snap into the locking mechanism on the base. The failure had occurred inside the vehicle. The car seat was not repaired or replaced. The manufacturer was notified of the failure. The manufacturer was in the process of replacing the car seat.

The contact owns a 2021 GMC Acadia. The contact stated that while driving at various speeds, the vehicle was unintendedly drifting to the right. The vehicle was taken to Dally Tire Company, where it was diagnosed with rear links failure and misalignment. The vehicle was not repaired. The vehicle was taken to the dealer, and the contact was informed that the VIN was not under recall. The dealer scheduled an appointment and provided an estimate for the repair. The manufacturer was not yet contacted. The failure mileage was approximately 42,200.

At low speeds the brakes squeal horrendously. We have taken the vehicle to the dealer multiple times and each time they state that the brakes are fine. A vehicle with this low of miles should not have squealing brakes since new.

the full audio system went out on the vehicle at 40,000 - the amp and safety warnings that come through the car audio failed and took 2 days to replace at my expense for the amp to have the features active

The attachment points for the upper chrome grille deflector have fractured, causing the trim piece to detach completely while driving and fly over my windshield which startled me and made me swerve dangerously. This is a known recall for the truck year before me and should clearly affect my truck too since the same description happens here

The rear shocks in my GMC Yukon AT4 failed and began leaking and had to be replaced. This supposed to be an off-road durable suspension and the shocks are failing?

the sensor on the left side of the vehicle fails to detect as it should. A warning indicator comes on the screen when you start the vehcile

with no warning ,the GMC 6.2L engine failed on my family trip to Colorado. The engine seized at HWY speeds, stopped running, failed to restart and had to be towed to local dealer. This issue is a known GMC defect with numerous reports and a safety recall issue. I was fortunate to be able to move offer in hwy traffic and get to the shoulder where my situation took 8 hours travel time to continue my family trip.

With no warning, my engine 6.2 L stopped running at highway speeds and failed to restart. The power train completely failed for a second time after having a previous engine replaced for the same failure in 2024. I had the car inspected per the recall along with changes in the oil viscosity as recommended along with service inspection. The car left me stranded again on rural highway for over 5 hours in temps that exceeded 98 degrees. The car would not start and went into a power save shutdown and had to be towed to the dealer. I was fortunate to have avoided any traffic on the highway enough to get the car off the road. This is not safe to drive on the highway and GMC has known defect and safety concern with this issue.