*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Steering
Thermostat housing failed. Got the message of "Steering Assist Is Reduced â Drive With Care". Have seen this numerous times in message boards. Has been reproduced. Safety is put at risk with the steering assist reduced. Mine happened on an highway.
Oct 4, 2026Steering
Engine thermostat not functioning properly, therefore the display stayed on cold and would not show temp. It also cause the fan to run fast to cool engine. The AC would not cool and reduce power steering assist error message comes on. This is a known problem by GM and there is a recall for this issue on many of these vehicles, other GMC and Cadillac vehicles. Our vehicle should be added to the recall list!
Sep 24, 2026Electrical system
Receive error message about Power steering that shuts off AC and Temperature gauges. Happens constantly when vehicle is driven on freeway. Requires the battery to be disconnected and it resets until the next time.
Sep 18, 2024Back over prevention › Rearview system braking
The rear camera does not operate 100% of the time. This has happened multiple times over the year.
Sep 19, 2025Power train
2020 GMC Acadia bucks/hesitates when I take off or slow down and speed back up. Mechanic looked at it can see engine is having random misfires. We have tried plugs, transmission fluid, looked at everything we could think of. The condition improves if I put into AWD but still exists and worsens for a period of time after it shifts back into FWD mode. My mechanic has done a lot of research and found that one possible issue was a stretched timing chain but since it is out of warranty I just couldn't afford to have them tear it down it is an enormous job to see if that was the issue. It also lines up with other known issues like the auto stop issues and possibly a fuel pump issue. I have seen…
Sep 21, 2026Engine
Engine thermostat not functioning properly, opening too early and not allowing engine to operate at proper engine temperature. Check engine light comes on, reduce power steering assist error message comes on, engine temperature gauge reads cold when vehicle has been running for an extended period of time. This is a known problem by GM and there is a recall for this issue on many of these vehicles, other GMC and Cadillac vehicles. Our vehicle should be added to the recall list.
Jan 1, 2025Service brakes
While driving my 2020 GMC Acadia SLT AWD Turbo with my young daughters in the vehicle, the brake pedal suddenly and sporadically lost all hydraulic pressure and sank nearly all the way to the floorboard. The vehicle would only gradually roll to a slow stop. Simultaneously, the dashboard illuminated with ABS and Service ESC notifications. After turning the vehicle completely off and restarting it, the braking system temporarily reverted to normal function before randomly failing again on a subsequent drive. The vehicle was brought to a local brake shop where it was dangerously misdiagnosed, and it is currently at a GMC dealership for an emergency teardown. Previously, without any warning,…
Sep 7, 2026Engine
Engine coolant thermostat failed open. Resulting in reduced steering capabilities, and no AC.
Aug 21, 2026
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.
