2021 GMC Acadia electrical problems

Filed Oct 29, 2026 · Electrical · VT

Vehicle stalled several times. Check engine light and many code came up. Crack sensors replaced. Veh still stalls. Dealer and independent dealer believes it might be cpu. All wires from cpu checked with no issue found. When veh stalls if you manipulate the wire veh will start and run with demished power and demished steering control. Rpm go to off mode. Has happened on highway and side road. Very scary with 3 kids in car on highway.... not able to resolve issue. Veh has a little less then 60k

Filed Oct 16, 2026 · Airbags, Driver assistance · 64,000 miles · WA · crash · 1 injury

The contact owns a 2021 GMC Acadia. The contact stated that while driving at 30 MPH, traffic stopped abruptly, and the brake pedal was depressed to the floorboard; however, the vehicle continued to accelerate while the Forward Collision Avoidance warning feature activated with a red warning light on the instrument panel. The contact attempted to steer off the road to avoid a collision; however, the vehicle crashed into the vehicle ahead, resulting in a three-vehicle collision. The air bags did not deploy upon impact. Another driver involved claimed unknown injuries, and the contact sustained whiplash but did not seek medical attention. Police were called, but a police report was not filed at the scene. The vehicle was towed to an independent tow yard. The manufacturer was notified of the failure and stated that the VIN was not included in a recall. The failure mileage was approximately 64,000.

Filed Sep 14, 2026 · Electrical, Fuel system · PA

While driving home from work the car displayed a "No Fuel" warning, despite having a full tank of gas. Within seconds of the display showing the car stalled out and stopped right in the middle of the road. It would not go into neutral and I had to be towed from the middle of the road to a mechanic close by. Upon reading forums online it looks like this is a known and common issue affecting the fuel pump sensor and system in these models. There are no open recalls but being this is known and happens so often I am shocked GMC has not taken ownership to recall and correct this issue. If I had not been on a slower road I could have gotten into an accident and, as I said, the car would not go in neutral so I couldn't even safely get off the road.

Filed May 30, 2026 · Electrical, Engine · ME

Display suddenly says "Steering assistance reduced, drive with care" Temp gauge goes to C and stays there. Radiator fans speed up and stay on after the car has been turned off. Dealer unable to find a diagnostic code for the problem.

Filed May 12, 2026 · Electrical, Transmission · MD

This is a very known issue that has been reoccurring with GMC Acadia. The torque converter slipping. That cost alone is over $7.000 for the transmission. I am still making monthly payments for my 2021 Acadia. With rising cost above the board GMC could have resolved this issue before releasing this vehicle to the public for purchase. Only had this vehicle for 2 years and already a new transmission is needed. Other individuals i personally know have the same issue. From my research GMC is aware and fails to do a recall on this issue.

Filed May 2, 2026 · Electrical · MA

The camera system has failed. The screen is black and there is an exclamation point and a camera on the screen.

Filed Mar 4, 2026 · Electrical, Engine · OH

Car has had multiple issues with check engine light coming on for the last 2 years and stays on especially during the winter months. The purge pump has failed multiple times. The cooling fan has run after engine shutting off for multiple years now. The thermostat has been failing for the last 6 months. Now yesterday low power protection suddenly turned on driving on the expressway limiting power in the middle of traffic. Was able to get off at exit without accident and get car home. I guess we have to pay out of pocket to get fixed. This is a known issue that GM fails to include every VIN with the 2021 year or certain models and VINS.

Filed Feb 4, 2026 · Electrical · 58,000 miles · IN

Odometer Fraud. The contact purchased a 2021 GMC Acadia. The contact discovered a mileage discrepancy after the purchase. The vehicle was a dealer sale. At the time of purchase, the mileage was approximately 29,000. The contact attempted to trade in the vehicle, and the purchasing dealer checked the VIN and retrieved a Carfax Report. The Carfax Report indicated that the mileage on the Title on 11/04/2024 was 58,000; however, on 02/04/2025, the mileage was 28,000, and the vehicle had been in an accident in the past.

Filed Jan 9, 2026 · Acceleration, Electrical · CT

The electronic dashboard goes black while driving. I was driving to work on the highway at highway speeds and the entire electronic dashboard went black including the hud display and the radio screen. The radio screen turned back on and auto reconnected to my phone and android auto. I was able to safely get to an exit and park, turn off the car and restart and the dash did come back on to then go black about 5 minutes later this time the hud stayed on and I was able to get to work where the car sat off for 8 hrs , when leaving work the dash stayed on. The radio screen would turn off randomly and unable to connect to a programmed cell phone via Bluetooth or data cable. I brought the vehicle in for a service and this issue plus the concern of the transmission shuddering. The dealership found the problem and both the dashboard and radio needed service updates and both were charged to fix. A service update should not be charged for the dash as you have no speedometer when it goes out. There was no warning or alert that the dash or radio needed an update.

Filed Nov 25, 2025 · Electrical · IN

The infotainment center/and On Star alert systems ( crash detections / SOS ) No access to anything in the infotainments center along with most of the safety setting not alerting due to and over the air update failure. yes is available for inspection upon request. all On star safety features are not working if a crash were to happen i would not be able to get help if i was injured. Yes and it is ongoing. BY a GMC certified dealer. No.