2012 GMC Acadia: check engine light

Filed May 21, 2026 · Engine, Transmission · 213,766 miles · OH

The contact owns a 2012 GMC Acadia. The contact stated that the vehicle failed to release from low gear while at a stop. The transmission was backed up. The engine light was illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted, who confirmed there were no recalls. The failure mileage was approximately 213,766.

Filed Aug 25, 2025 · Engine · 172,000 miles · WA

The contact owns a 2012 GMC Acadia. The contact’s wife stated that while driving at an undisclosed speed, the vehicle lost motive power with the check engine warning light illuminated. The vehicle was able to be restarted; however, the failure persisted. The vehicle was towed to the dealer, but was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 172,000.

Filed Jun 30, 2025 · Engine, Steering · 130,000 miles · MN

The contact owns a 2012 GMC Acadia. The contact stated that shortly after purchasing the vehicle, the check engine warning light illuminated. The vehicle was taken to the local mechanic who discovered that the catalytic convertor was faulty and needed to be replaced. The mechanic also inspected the vehicle and determined that the steering rack, front struts, and suspension control arms were also faulty and needed to be replaced. The vehicle was not yet repaired. The local dealer was notified of the failure, but no assistance was offered. The manufacturer was not contacted. The failure mileage was 130,000.

Filed Jun 24, 2025 · Electrical · MA

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. Salvador ended up replacing the anti-theft control module after the 3rd time having to tow it back and forth just to leave the shop and I couldn't start the vehicle the next day after handing over almost another 400$ and less than 15/20 miles of drive time. GM needs to get this issue figured out!!! There anti-theft system locks people out from starting their vehicles more than it does actually preventing actual theft. This will eventually end up causing a major crash at an intersection or highway if the anti-theft system keeps failing it just randomly cuts out power to the engine while driving.

Filed Jun 22, 2025 · Engine, Fuel system · NE

Ratle sound in the engine thinking it may be the timing chain. Code p0430 came on stating catalytic converter bank 2 needs replaced. We replaced o2 sensor downstream on bank 2 code was cleared by shop. After driving a few miles same check engine light came on and i took it to the shop they hooked it up to run the code and it was the same p0430 again

Filed Sep 22, 2023 · Engine, Transmission · 158,000 miles · WI

The contact owns a 2012 GMC Acadia. The contact stated that while driving 70 MPH, the RPM would rise to 4,000 however, the vehicle failed to respond as intended. The check engine warning light was illuminated. The contact pulled over to the side of the road and inspected the vehicle and became aware of smoke coming from the engine compartment. The vehicle was towed to an independent mechanic where it was diagnosed that the engine block, camshaft, reverse gear, and transmission housing needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 158,000.

Filed Aug 19, 2023 · Electrical, Steering · WV

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.

Filed Apr 18, 2023 · Engine, Fuel system · OH

I was driving 40 mph, when warnings appeared on my dash. "Service Stabalizor control", "Traction control turned off", "power is reduced", and the check engine light came on. I lost power as if engine quit, no acceration, but then came back intermittent. If I had been on a highway going 65 mph, in heavy traffic, there may have been an accident. Power steering remained on. I took to an auto service business, and they were unable to find the problem. Code indicated a fuel pressure problem.

Filed Sep 9, 2021 · Brakes · MA

The brakes on the vehicle have failed 5-7 times within the past year and a half. By "failed" I mean that the pedal was touching the floor of the vehicle and did NOT engage. Mechanic was unable to replicate the failure any of the three times we took it in to get it looked at. The brake pads, rotors, and fluid lines have all been checked multiple times and are all in good condition. The master cylinder was replaced and the brakes worked well for about 6-7 months. Approximately 3 weeks ago, the brakes failed entirely, yet again, this time driving on a highway at 70mph. The emergency brake had to be used in order to get the vehicle to slow down. The vehicle was then dropped off at a local dealership, who has kept it for about 2 weeks and states that they cannot replicate the problem when they take it for a test drive. We have 2 young children and this has been our primary family vehicle. There has not been a check engine light or any other warning lamp AT ALL.

Filed Feb 10, 2021 · Engine, Steering · 105,000 miles · GA

I have 2 ongoing issues, 1st is the car will be driving fine then get a check engine light and have a code for cylinder misfire. Car was at dealer multiple times with issue and could not duplicate while under extended warranty. Mysteriously the intake has to come apart and be reworked since the warranty expired, and still has same issues. The 2nd and more concerning issue is the power steering. Initially took in and told the rack and pinion needs changed. Still had same issue and told power steering now needs to be changed, so we did. Sound and still stiff after 2 racks and 2 pumps. Mechanic refused to work it again. Took to dealer yesterday. Says needs new power steering pump. So dealer took for a test drive and said it's still doing it and needs another rack and pinion. At what point is gmc that has a known safety issue with steering going to fix this issue. I can't keep throwing money at this thing and I can't feel unsafe in it. What can I do?

Filed Feb 5, 2021 · Engine · 112,000 miles · IL

Engine light came on. Turns out to be cadillac converter.

Filed Jul 21, 2020 · Engine · 100,000 miles · IN

Tl* the contact owns a 2012 gmc acadia. The contact stated that at start-up, the engine misfire with the check engine warning light illuminated. The vehicle was towed to an unknown dealer to be diagnosed. The mechanic stated that the timing chain needed to be replaced. A secondary independent mechanic confirmed the failure. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 100,000.