Back up camera randomly stops working (black screen-completely gone, or blue screen). Dash will randomly dim on its own and does not go back to normal unless car is shut off and turned back on. adaptive cruise control will disengage for no apparent reason. stabilitrak will flash on screen but no other indicators or reasons; nothing happens with car. Occasionally the blind spot mirror lights will not light up when vehicle is present.

Source: NHTSA complaint ODI #11738492 · view all complaints for this vehicle at nhtsa.gov

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, the vehicle would also experience a brake failure upon backing out of my garage. Once the brake was immediately pressed again, it would work. This intermittent loss of total stopping power constitutes a severe, life-threatening manufacturing defect.

Source: NHTSA complaint ODI #11763346 · view all complaints for this vehicle at nhtsa.gov

"Steering Assist Is Reduced – Drive With Care" warning appeared while the vehicle is in motion. This may require increased steering effort and could affect a driver's ability to respond to changing traffic conditions. Any steering-related warning that appears unexpectedly while driving deserves serious attention. P0128 code was shown. The cause was a faulty thermostat housing assembly and needed to be repaired. This is an extremely common issue in this vehicle across many years and needs to be investigated.

Source: NHTSA complaint ODI #11748973 · view all complaints for this vehicle at nhtsa.gov

The contact owns a 2020 GMC Acadia. The contact stated that the front driver's side and front passenger’s side seat belt locking mechanism failed to remain latched. The contact stated that while driving, the seat belts would erroneously become unlatched. The vehicle was taken to the local dealer who diagnosed that the seat belts needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 35,000.

Source: NHTSA complaint ODI #11578048 · view all complaints for this vehicle at nhtsa.gov

The contact owns a 2020 GMC Acadia. The contact stated that the doors failed to open from outside the vehicle while using the key fob or while attempting to open the doors manually. The contact entered the vehicle from the rear hatch door and discovered that the door lock and unlock buttons were inoperable. The contact pulled the door handle to manually open the door from the inside. The cause of the failure was not yet determined. The manufacturer and local dealer were notified of the failure, but no assistance was provided. The failure mileage was 68,140.

Source: NHTSA complaint ODI #11722524 · view all complaints for this vehicle at nhtsa.gov

Steering assist reduced is the warning. The AC will no longer work and the fan runs constantly. From what I’ve read, it is a popular problem for Acadia owners and the thermostat and sensor has to be replaced. We have not been able to replace ours yet because of the cost.

Source: NHTSA complaint ODI #11748881 · view all complaints for this vehicle at nhtsa.gov