Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2011 Buick Regal owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2011 Buick Regal. The contact stated while driving 30 MPH and accelerating to enter the highway, the vehicle stalled. The contact stated that the traction, stability, and engine power reduced warning lights were illuminated. The contact stated she was able to park on the side of the road for 30 minutes before continuing to drive to her destination. The contact took the vehicle to the local dealer however, the mechanic was unable to diagnose the cause of the failure. The contact also stated that she was unable to open the doors due to the battery not charging. The vehicle was not repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 140,000.
Preparing to park into a parking space in an off street parking lot the vehicle forcefully and rapidly accelerated on its' own and crashed into a fence. I was not accelerating. I attempted to stop the car using the brakes but they did not engage quickly enough to stop the rapid, forceful, and without warning acceleration. Buick has been contacted about the defect. Buick ran extensive diagnostics on the car and denies there is a defect. Police came to the scene and advised that given the 2 other incidents that I have experienced, the car is unsafe to drive given potential damage to others. A police report was filed.
While the vehicle was driving, there was a loss of power, at that moment sparks was seen emanating from under the hood, then the vehicle completely stopped running. Once pulled over smoke was bellowing out from the hood and subsequently ignited into flames. Fire department was dispatched and fire was extinguished. The vehicle was towed away and is still at the tow yard. The tow operator, based on visual inspection stated the fire did start in the engine compartment and spread to the fire wall, totaling the vehicle.
The contact owns a 2011 Buick Regal. The contact stated that while driving at 30 MPH, the vehicle stalled with the check engine warning light illuminated. The vehicle was able to be restarted. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 140,000.
I was parking in marked space. I had turned into space, my foot was off the gas pedal. The car was 3/4 into the space when it malfunctioned and rapidly accelerated into a hardened snow bank. i instantly braked but there was not enough space to avoid collision.
The contact owns a 2011 Buick Regal. The contact stated that while driving on several occasions the headlights became inoperable. The check engine warning light was illuminated. The vehicle was taken to an independent mechanic who informed the contact that the wiring in the bumper was hot at the base. The vehicle was taken to the local dealer where the engine was diagnosed. The vehicle was not repaired. The manufacturer was not notified. The failure mileage was unknown.
While driving on the highway at 60 mph, warning on dash came on saying "engine power reduced" and drop down speed to around 25 mph and I could not accelerate more than 25 mph on the highway which could have caused an accident because of the traffic flow behind me. I put a code scanner under the dash and it read code P2138, Throttle pedal position sensor switch.
The cars mileage was altered due to car being wrecked prior and the other car that was used to replace wrecked parts was hidden and vin number was altered. Copart Inc and ICT Sharp Rides are party's involved, I bought car on 12/28/2023 mileage was listed as 132525
When pulling into parking space the car rapidly accelerated on its' own and crashed into the car in the next parking space. I did not have my foot on the gas, the car was simply idling. The acceleration was so rapid that applying the brake was useless.
Purchased car in summer of 2011. During the first cold weather car would give a warning to service stabiliti trac and that the engine power had been reduced. I decided to pull over and restart the vehicle and it would reset the computer and the warning lights would turn off. I took this to the dealer and they could not replicate the issue. I started to let the car warm up in the winter and this seemed to help until recently. Within the last few weeks I have been having similar problems even after letting the car warm up. The car will automatically reduce engine power even while on the highway making it difficult to get out of the way of traffic. After these incidents the check engine light will come on but will go off after turning the car off and restarting. I have contacted OnStar and they tell me the same thing that the warning lights do. …
Engine complaints in other Regal years
Frequently asked questions
How common are engine problems on the 2011 Buick Regal?
NHTSA has 111 complaints about the engine & cooling of the 2011 Buick Regal, 40% of the model year's 280 complaints. The component named most often is exhaust system › emission control › crankcase (pcv) (1 mentions).
Is there a recall for 2011 Buick Regal engine problems?
No. NHTSA lists no engine & cooling recall for the 2011 Buick Regal, though it has 4 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 2011 Buick Regal engine problems start?
Half of the complaints with a recorded mileage happened before about 70,000 miles, and 13% before 25,000 miles.
Is it dangerous?
Owners linked 2 crashes, 1 fire and 3 injuries to engine & cooling 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.