GMC Complaints

Seemingly at random a warning will pop up on the driver dashboard “Steering assist is reduced at this time”. This will lead to a engine coolant temp reading of 0 degrees, no a/c and reduced steering functionality. Through further investigation the OBD code P0128 tells us it’s a faulty Thermostat or Thermostat sensor. Even if you get these parts replaced, the issue still comes back. I’ve seen these exact complaints at least a thousand times across multiple years of this model/make 2016,2017,2018,2019. This is clearly a manufacturers fault and needs a recall before people get hurt.

drivers side tail light flickering and sometimes not working a $900+ cost! I issue with right hand side when suv has 32k miles, seems like this is an ongoing issue, luckily it was still under warranty the 1st time. The AC condenser when out in April, also an know issue with the Yukon, they wanted to charge me $1500 to repair, I was able to find someone to do it for around $600, now the outlet and usb ports seem to not work. I also had an issue with the braking system , dealer couldn't figure it out, I finally found someone to repair it, $500 fix. For what I paid for the Yukon, you would think they would use top of the line parts!

The contact owns a 2013 GMC Terrain. The contact stated that the vehicle failed to start up with the check engine warning light illuminated. The vehicle was towed to an independent mechanic to be diagnosed. The contact stated that there was compression failure in each cylinder, causing the timing belt to jump timing, and the engine needed to be replaced. The vehicle was not repaired. The manufacture was not notified of the failure. The failure mileage was approximately 153,514.

The contact owns a 2016 GMC Acadia. The contact received notification of NHTSA Campaign Number: 23V334000(Air Bags) however, the part to do the recall repair was not yet available. The local dealer was contacted, and it was confirmed that the part was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced the failure. VIN tool confirms parts not available.

While driving the truck began switching between towing, normal, and off-road driving modes. Lights were flickering and various messages were being displayed on the dash cluster screen. After parking truck and shutting it off all of the lights were flickering and I was unable to start the truck. Charging the batteries did nothing nor was I able to jumpstart the truck with another diesel. After repairs for these issues, at some point the odometer reset and while likely not certain it reset to zero. GM has no way of knowing when it reset and how many miles were driven between leaving the dealership and the reset leaving me with a truck set to the best guess mileage. I am being told this was a software bug and having experienced another software bug when I had the recall to enable seat warmers where the keyfobs would not work in any way I have serious concerns about the quality and safety of the software on these trucks.

The contact owns a 2021 GMC Yukon XL. The contact stated that while driving at various speeds, the check engine warning light illuminated, and the Diesel Exhaust Fluid (DEF) message was displayed. During the failure the vehicle decelerated. The vehicle was taken to the local dealer who replaced the NOX sensor, but the failure persisted. The vehicle was taken back to the local dealer who was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 16,448.

The contact owns a 2020 GMC Acadia. The contact stated while driving from a complete stop and depressing the accelerator pedal, the vehicle hesitated to respond. The contact stated that the failure also occurred while driving at various speeds. Additionally, the contact stated that the vehicle experienced unintended downshifts while driving. The contact stated that the engine revved significantly without the accelerator pedal being depressed. The messages "Unable to Shift Gears" and "Service Vehicle” were displayed. The contact stated that the failure had been recurring while driving. The dealer was notified of the failure and an appointment was scheduled for diagnostic testing. The vehicle was not yet diagnosed or repaired. The contact related the failure to NHTSA Campaign Number: 20V668000 (Power Train); however, the VIN was not included. The manufacturer was not notified of the failure. The failure mileage was approximately 80,000.

The contact owns a 2019 GMC Canyon. The contact stated that the key failed to release from the ignition. Additionally, the key failed to turn in the ignition switch. The vehicle failed to turn on or off. There were no warning lights illuminated. The contact called the local dealer and was informed that a diagnostic test needed to be performed. The vehicle was not diagnosed or repaired. The manufacturer was contacted, and informed the contact that there was no Warranty coverage for the vehicle. The failure mileage was approximately 52,000.

Driving at 70 mph, the vehicle shifted into neutral without warning. When attempting to place the vehicle back into drive, the vehicle dashboard Siad "vehicle condition not met" . I slowed the car and pulled over. It shifted into park but now will not start and will not go into neutral for towing.

Major potential for deadly fire or explosion. Fuel tank strapped failed after forward strap bolt fell out of threaded cross member where fastened in frame. The failure led to the fuel tank hanging inches off the ground on the freeway stressing fuel pump lines to forward upper tank. Metal grinding noises heard to prompt roadside inspection confirming hanging, unsecured tank full of 26gal of diesel. The tank wedged the fuel tank strap between plastic tank and drive shaft (propeller shaft) with heat and potentially spark as the the metal strap ground into the drive shaft marring and striating the durable metal. Heat and plastic melts, heat and spark with diesel combusts..in addition to risking of dragging tank at highway speed rupturing tank. Upon service at the dealer, mechanic observed the rear bolt to fuel strap was also loose and needed to be secured. GMC Protection Plan denied compensation for coverage as they do not cover "bolts, fuel straps, or manufacturer defects" under advertised "Bumper to Bumper" GMC Protection Plan marketed by GMC dealerships as protection for all non-wearable parts. No warning indicators appeared. My dog was in the truck bed in a camper shell directly above the potentially massive fire or explosion, this could have been catastrophic if it had been ignored. Additionally I was in northern California and southern Oregon when issue presented- potentially causing a major forest fire incident. While my outcome was fortunate in terms of safety, this could claim lives and even massive incidental loss of property. Vehicle has been inspected by local dealer and GM notified, hoping to receive coverage for damaged parts. Interestingly, there was previously a GM recall involving forward fuel strap dislodging and wearing into drive shaft on previous years of GM vehicles. No notable corrosion observed, bolts in question are high on frame secured to protected cross members, occurred at approximately 75K miles. I have photos on another device, if needed.