2012 GMC Acadia electrical system problems

What owners report

• “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.”

  NHTSA complaint · filed 08/05/2026

• “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 batte…”

  NHTSA complaint · filed 06/24/2025

• “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.”

  NHTSA complaint · filed 05/31/2025

• “I was driving along [XXX] . 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 [XXX] 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 fo…”

  NHTSA complaint · filed 05/22/2025

• “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”

  NHTSA complaint · filed 08/21/2024

• “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.”

  NHTSA complaint · filed 09/13/2023

• “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 …”

  NHTSA complaint · filed 08/19/2023

• “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.”

  NHTSA complaint · filed 06/13/2023

Unverified owner reports from NHTSA's public complaint database.

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