Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2012 GMC Acadia owners, lightly cleaned up (personal details are redacted by NHTSA).
This 2012 GMC Acadia denali with close to 160k has been in the shop several times due to it randomly stalling out It kept basically locking me out from starting the car a "service anti-theft system" would flash across the dash followed by a flashing check engine light along with a lock and key symbol. A local GM repair shop had it in 3 times for them to tell me they couldn't figure it out or get the vehicle to "act up" they cut me two new keys and tightened up what they claimed to be loose battery cables just for the vehicle to die/stall with a no crank no start happen literally 10 minutes down the road after paying almost 600$ for repairs and that it was towed back 3 times for the same issue spanning over two months of them not being able to figure out the issue. …
No warning light when transmission went out. Traction control/stabiltrac service light came on, doors locking and unlocking, not stating what gear acadia was in. Check engine light eventually came on, after it stalled twice on highway. Vehicle is at gmc dealership service department and they are saying its not communicating and are checking wiring harness wires. I have replaced transmission and torque converter and now i dont know what to expect now. Only had it for 3 years so far. I almost got rear ended when it stalled twice before backfiring and a rough swift shift.
Hello so I notice 3 weeks ago my headlights keep cutting off and on then a week later my radio stopped working, The floor of the driver side is always wet after it rains. I noticed one day the rain started dripping on my feet when I drive after a big rain fall, I believe the car is not sealed properly and now water is coming out from the airbag signs in my vehicle and the car starting to smell like mildew. I think water is sitting in certain parts of my vehicle. I'm not sure what to do.
I HAVE A 2012 GMC acadia denali with about 147,000 miles on it and the "Service Air Bag" light is on I brought it somewhere to have the code read and the said there is about 5 different codes popping up for the issue... I've called auto shops around me locally and can't find anyone that is willing to look at it. I just want to know what my best options are as to getting this issue resolved. As I have never been in an accident so I don't know why the air bag light is on.
The automatic passenger side window does not work anymore, it went out a couple months after I bought it. I have always done maintenance on my vehicle, oil changes, tires, etc. and the timing chain went out on it for some unknown reason. Very pricey to fix. I would hate to be stranded with my 6 grandchildren with. With all the complaints on the timing chain, this should be a recall.
The car shutdown mid-driving do due to a power system issue, which was dangerous on the highway. I had the car battery and the alternator replaced and it did the same thing again 8 months later. Says the battery system needs servicing
Vehicle producing code P2138 then goes into limp mode stating to service stability, traction control off and engine reduced power. Replaced Throttle Body and Acceleration Pedal Position Sensor and error was still present.
I was driving along [redacted] . I stopped at Walmart and shopped for about 2 hours. I was Leaving Walmart and was stopped at a red light at the exit from Walmart [redacted] and traction control light comes on and a message came up and stated traction control off and to service stability control and the vehicle loses power right at the light. I checked everything I could and dis connect the battery for about 30 minutes and connected the battery back up vehicle still would not start. After sitting there for 3 hours the vehicle starts up. A week later the same thing happens again. I had to go through all the steps again so after a couple of hours. The vehicle started up. A few days later it happens shin but this time I'm at a stop sign on a busy road. I called Road side service for a tow. …
My GMC Acadia denali has a little over 80,000 miles. I have other vehicles for everyday use so I only drive the Acadia for long distances over the weekend. The vehicle sits in the garage when not in use. I have had no issues with the vehicle until I took it to the dealer to have one of the head light bulbs on the passenger side replaced. After I picked the vehicle up I drove it to new york and on my way back (the next day) had the service light come on to let me know there was a problem with the battery. I looked at the battery indicator in the dash and noticed the charge was getting lower and lower. By the time I got to baltimore, md the indicator was below 12 and the vehicle finally shut off. Towed the vehicle to the dealership and they first replaced the battery but that didn't fix the problem. They then replaced the alternator. I drove the vehicle three times and it worked fine. …
We bought this used car from a dealer drove it about 4 to 5 months and the left signal light failed, so we changed it worked for one day and then went dead again. Turning left from my street the steering was really hard and had problems turning left but I did finally on another occasion the same thing happened. Finally driving suddenly we saw a turn engine off and the engine started making loud noises and went dead in the middle of the street. So we kept gliding with no engine running and went into a parking lot. Lucky for us the car stopped right in the parking lot. Had to be towed few miles to a mechanic that told us the timing chain is broken and in need for new engine. We towed it to another mechanic and the same thing was told. So now it is been sitting at the mechanic's shop for two week waiting for new engine to come in . …
Electrical complaints in other Acadia years
Frequently asked questions
How common are electrical problems on the 2012 GMC Acadia?
NHTSA has 41 complaints about the electrical system of the 2012 GMC Acadia, 14% of the model year's 296 complaints. The component named most often is instrument cluster/panel (1 mentions).
Is there a recall for 2012 GMC Acadia electrical problems?
No. NHTSA lists no electrical system recall for the 2012 GMC Acadia, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2012 GMC Acadia electrical problems start?
Half of the complaints with a recorded mileage happened before about 84,000 miles, and 7% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 0 fires and 2 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.