Car Accelerates On Its Own Problems of GMC Acadia

On 15 plus occasions, while the vehicle is stationary, in the parking gear and running, the front end will start to vibrate mildly, increase in intensity and then the traction loss light illuminates, a blinking engine light illuminates, "service stabilitrak" and "service traction control" messages appear. Then traction contol off appears, followed by an audible loud click and vibration ceases, messages disappear and lights turn off. Once while vehicle in drive and being operated on a roadway, I pulled right at an intersection to have this same sequence happen during driving, resulting in an almost complete loss of power and acceleration and a near accident. The sequence was identical and once the errors cleared the vehicle accelerated rapidly and forcefully. I have documented multiple occasions on video while stationary over a multi month period and have furnished those documents to my local GMC dealership which has failed to repair this issue and today returned my vehicle to me with an apology for not being able to remedy the problem. They claim that the vehicle must exhibit this behavior in their presence to warrant a fix. The vehicle is under an extended warranty that clearly covers these problems. I would be happy to email the videos, but they are not in the supported format and likely larger than 5mb.

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The contact owns a 2015 GMC Acadia. While driving various speeds, the vehicle experienced unintended acceleration and the contact had to exert excessive pressure to the brake pedal. The contact then heard an abnormal noise coming from the front of the vehicle. The contact stated that the vehicle independently disengaged and slowed down. There were no warning indicators illuminated. The vehicle was not diagnosed or repaired. The manufacturer was notified and made arrangements to have the vehicle towed to a dealer. The failure mileage was 35,021.

The contact owns a 2012 GMC Acadia. While attempting to park the vehicle, it accelerated unexpectedly through a garage door. The brake pedal was depressed, but the vehicle failed to stop. The air bags did not deploy. There were no injuries. The vehicle was towed to the dealer and the diagnostic results were not disclosed. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 36,000.

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Vehicle experiencing bad transmission problems when shifting between 3rd and 5th gears. As accellerating, the vehicle begins to shift, but begins to idle and rpm's rise extremely high. Vechile begins to slow down and finally jerks into the next gear causing rapid acceleration. This issue almost caused me to run into a car in front of me after pulling off from a stoplight. It is extremely scary to continue to drive the car, but with this being my only vehicle and I must work, I am forced to drive daily. Warranty just expised 5 months ago in March and I cannot afford to fix the problem (March 24, 2013, 5 year/100,000 mi. Powertrain). Vehicle was purchased March 24, 2008.

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The contact owns a 2009 GMC Acadia. While driving approximately 80 mph, the contact depressed the break pedal but the brakes would not respond and the rpms abnormally increased to approximately 6,000. The contact was able to stop the vehicle after continually depressing the brakes. The contact heard a loud popping sound once the vehicle came to a stop and noticed smoke emitting from the front passenger side of the vehicle. The vehicle was taken to the dealer for diagnostics. The technician replaced the front and rear brake pads and rotors, and stated that the floor mat had become entangled with the accelerator pedal. He failure caused the vehicle to accelerate suddenly. The contact did not agree with the technician's diagnosis. The vehicle was repaired. The approximate failure mileage was 60,830. Updated 05/24/lj.

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The contact owns a 2010 GMC Acadia. While attempting to park, the vehicle suddenly accelerated without warning causing the contact to crash into a light post and another vehicle. A police report was filed. She then applied the brakes in order to stop the vehicle, stating that speed had increased 100 percent. The vehicle was towed to the dealer where the manufacturer was notified and sent an investigator to retrieve the black box from the vehicle. After inspection, the manufacturer advised the contact that the vehicle was operating as designed and that the failure was caused because she had depressed the accelerator. The contact was awaiting repairs to the vehicle. The current and failure mileages were 26,733. Updated 11/07/11.

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I noticed that when driving on an expressway and would attempt to pass a slower moving vehicle, as I would move into the passing lane and attempt to accelerate, the car would hesitate for a few seconds, lose speed, then suddenly downshift and accelerate at an unexpected rate. I also noticed that the car would unexpectedly accelerate or decelerate under normal driving conditions. I bought the vehicle to the dealer for repair, they responded that they could find nothing wrong, but the what I was experiencing was characteristic of the 6-speed transmission on the vehicle. The problem continued and I found it dangerous. I returned the vehicle and the dealer's remedy was to "reset the transmission computer. " during this time, I also noticed that the "service stabilitrac and traction control" warning would come on. Onstar recommended I shut off the engine to reset the system. I found this only happened when I first used the car in the mornings to go to work. Again, the dealer said there was nothing wrong and the computers were showing no codes -- they also stated that they could not duplicate the problem. I got the car back from the dealer and it happened again - at 7:00 am. I called onstar and they gave me two codes. I bought the car back to the dealer and gave him the codes. It now seems that there were two defective sensors controlling the stabilitrac / traction control system and how they communicate with the transmission. I was told that gm is changing manufacturers on the sensors. I have not had use of the car since the beginning of June and am still waiting for gm to produce these parts. In the meantime, unexpected acceleration, deceleration, and gear shifting was occurring under all driving situations causing -- in my mind -- a danger to myself, my passengers, and others. The dealer has had the car on five different occasions since June 8. This last service they have had the car since July 20.