GMC Complaints

This has now happened 4 times and I'm taking the truck to the dealership to figure out what the issue is. At high speeds, 65 to 75 mph, on the freeway, the rear brakes suddenly lock up for no apparent reason. Extremely dangerous for myself and surrounding vehicles, especially behind me. The most recent incident pretty much gave me whiplash because it's unexpected with no warnings whatsoever. The freeway was clear, with light traffic. I was almost rear ended because the vehicle behind me had no reason to believe the my vehicle was going to suddenly come to an abrupt stop. I looked up any known similar issues for the 2023 model, and found that there GMC did a recall for similar issues on the up to 2022 models, but that the issue had been resolved. Obviously it hasn't.

I have a 2021 GMC Acadia that keeps saying steering assist not available. But when it does this, the temperature gage stops working and so does the AC. After you turn the car off the fan still runs for at least 10 minutes.

Every time I pull the truck into my garage or a parking stall at low speeds while using the front park sensor it will shut off with the automatic start stop while still in motion. Then you have to let off the brake pedal for it to start and sometimes the vehicle will search forward.

The transmission control module stopped working leaving the vehicle unable to be driven and no part support from gmc/allison and part is backordered with no eta. There are reports the module becomes defective due to its placement near engine heat. There should be a recall for this issue. Many people are experiencing this issue

We have been keeping up with all maintenance and oil changes. We have only driven the car for less than a year. At time of oil change; the oil has been low, resulting in OVER oil consumption; Requiring an extra quart of oil to be added between oil changes. When we purchased the vehicle, there was an strong exhaust smell; The shop that we bought the vehicle stated there were no issues and we have taken it to them multiple times an hour away from our home. The car completely shut off while my minor son and I were driving. Placing both of our lives at risk! It would never start back up. Now the car has seized and requires an engine replacement. It is sitting at a local garage while we wait for the dealership to help us, to no avail.

The console screen that control many vehicle functions will often not boot up when the vehicle is started. Screen crashes have also happened while underway. The screen will be unresponsive to both touch and physical controls. Systems unable to be controlled include safety cameras and sensors, climate control, navigation, gauges, infotainment and others. I have attached a diary of specific issues and work arounds attempted. The dealership and GM do not appear to have methods of fixing the issue at this time.

2020 gmc sierra 1500 elevation 5.3l engine. Lifter failure due do faulty design I’m afm/dfm systems.

While driving at highway speeds, a warning appeared on the Driver Information Center (DIC): “Steering Assist is Reduced – Drive with Care.” Simultaneously, the temperature gauge was stuck on “C,” the radiator cooling fan ran at high speed, and the air conditioning stopped blowing cold air. After researching the issue, I discovered that these symptoms are commonly linked to a failing thermostat—a known and widespread problem with GM’s 3.6L LGX engine. Unfortunately, replacing the thermostat on this engine is not a simple repair, often requiring significant labor and cost. The most concerning aspect is the loss of steering assist, which poses a serious safety risk, especially at highway speeds. Given the frequency of this issue across many GM vehicles, it’s clear that this is a defective part and not an isolated incident. GM should take responsibility and cover the cost of repairs for affected vehicles. This is not just a mechanical failure—it’s a safety hazard that deserves immediate attention. I'm attaching a picture of the message as well a paid repair invoice from the work the dealer performed to replace the thermostat on my vehicle.

Seatbelt light for the front driver continues to turn on even when buckled in and will ding to notify that it’s not buckled despite it buckled in. This is a safety issue as the airbag light also remains on because of it.

I HAVE THIS 2022 GMC TERRAIN WITH 19,000. MILES ON IT. IT IS OUT OF WARRANTY BY 2 MONTHS AND NOT YEARS OR MILES. ON 6-23-23 THE VEHICLE WAS BROUGHT TO NAPELTON GMC FOR A RECALLED FUEL PUMP FLOW MODULE. IT WAS FIXED AND THE RECALL WAS CLOSED. HOW EVER NOW 9-2-2025 WITH 19,000 MILES I AM EXPERICING THE SAME ISSUE AGAIN. IT WAS TOWED TO THE DEAL AND DIAGNOSED WITH THE SAME ISSUE. THIS TIME THEY ARE NOT COVERING IT BECAUSE THE RECALL WAS COMPLETED. HOWEVER I FEEL THAT WITH ONLY GOING 13,000 MILES SINCE REPAIRED THEY SHOULD BE COVERING IT AGAIN. THEY TOLD ME THE REPAIR COST IS "TO LITTLE" TO OFFER ANYTHING. THE COST WITH THE TOW IS AROUND $762.00 . i WAS TOLD BY GM "NOT THE DEALSHIP" THAT IF I SUBMIT A TICKET SHOWING THE VEHICLE WAS REPAIRED THEY COULD LOOK AT OTHER COMPNESATION OPTIONS. PLEASE HELP. I ONLY AM ARGUING BECUASE THIS WAS A RECALLED ITEM THAT HASNT LASTED VERY LONG.