Chevrolet Volt sudden acceleration problems

Filed Sep 29, 2026 · AL

The vehicle operates normally in all-electric mode for its full range of approximately 48 miles. The failure occurs consistently at the exact moment the high-voltage battery depletes and the vehicle attempts its automatic transition from electric propulsion to the internal combustion engine. At the point of transition, an unexpected surging or sudden acceleration occurred, followed immediately by a propulsion power reduced warning and an engine not available message on the instrument panel. The gas engine completely failed to engage or deliver power. Because the battery was depleted, the vehicle suffered an immediate, severe loss of motive power and rapidly decelerated in active traffic despite full depression of the accelerator pedal. This sudden inability to maintain road speed during the powertrain handover left the vehicle stalled in traffic, creating an acute risk of a rear-end collision. The vehicle has not yet undergone formal inspection or scanning by a dealership or repair facility due to diagnostic fee barriers that should be covered by manufacturer safety protocols. The vehicle and its components remain in their failed, unmodified state and are available for inspection upon request. The failure condition involves a breakdown in hybrid powertrain handoff systems, consistent with documented defects in the battery energy control module (BECM) under GM Special Coverage Program N232432680, or critical failures in the engine management and exhaust gas recirculation circuits that prevent transition to gasoline power. General Motors must investigate and address the safety implications of plug-in hybrid vehicles abruptly losing all motive power when electric charge is exhausted.

Filed Jan 26, 2026 · Acceleration, Fuel system · CA

This vehicle has had multiple incidents of surging of the propulsion system both on battery power and when powered by the internal combustion engine, causing loss of propulsion and sudden acceleration almost causing collisions multiple times. We have paid for over $4,000 in repairs that are not covered under the propulsion system warranty, and these repairs have not remedied the issue.

Filed Aug 4, 2025 · Brakes · OH · crash

I was stopped at a red light with my foot on the brake. When the light turned green, I released the brake and the car suddenly accelerated forward on its own, without me touching the accelerator. As soon as the car surged forward, I immediately pressed the brake pedal hard to stop it but instead of slowing down, the car continued to accelerate. It felt like pressing the brake was making it worse. The car was totally out of my control. The vehicle collided with tow truck and even after the impact, the engine was still revving as if it was trying to keep going. I had to shut the car off to stop it completely. There were no warning lights or error messages before or during the malfunction. The front end of my car was damaged in the crash. No one was injured, but the malfunction could have easily caused serious harm or death. This was not user error it was a terrifying mechanical and electronic failure. The car accelerated on its own and the brakes failed or possibly triggered more acceleration. I have never experienced anything like this. After looking online, I found other Volt owners reporting similar problems involving brake assist failure, unintended acceleration, and stuck revving. This looks like a serious pattern that deserves urgent attention. I’m asking the federal safety agency and General Motors to immediately investigate this issue. I want to know if there are any recalls, technical service bulletins (TSBs), or known defects related to brake failure or unintended acceleration in the 2011 Chevy Volt. Please contact me with next steps. This is a major safety risk that could easily result in fatalities if not addressed.

Filed Jul 30, 2025 · Electrical, Engine · CA · crash

I was slowly maneuvering my car into my garage when the vehicle suddenly and unexpectedly surged forward, despite only lightly tapping the brake and not touching the accelerator. The car had been displaying the warning, “Propulsion Power is Reduced” and was not holding an electric charge in the days before the incident. No malfunction indicator lamp ever turned on. Per the owner’s manual, the vehicle did not need to be serviced because the malfunction indicator light never came on at the same time as the propulsion power reduced message. This led me to believe the vehicle was safe to drive. The unexpected surge caused the car to strike and cause considerable damage to the garage wall. Fortunately there was no one in the garage at the time and I, myself, was not injured. My car was deemed a total loss by the insurance company.

Filed Jun 11, 2020 · Transmission · 44,000 miles · CA

My volt produces an error message: "action required: shift to park" after placing the car in park and tapping the power button. As a result, I cannot turn off the vehicle without a series of turning the car on and off again whilst shifting back and forth from drive to park. My concern is that this extra action will one day produce an unintended acceleration into a person or structure that may cause death, damage or dismemberment to myself or others. I've found numerous reports online that the issues stems from a known problem involving the shift assembly but my local dealership refused to inspect the vehicle without charging a $160 diagnostics fee that may increase based on the issues at hand, which I declined. I've mentioned that this was heavily catalogued on gm forums and my service advisor agreed but mentioned they only offer no cost replacements when the issues happens under 36k miles and I am at 44k miles. A recall should be initiated for the reasons mentioned above.

Filed Jan 29, 2020 · Acceleration, Brakes · 15 miles · CA · crash · 1 injury

After fully charged my car, I pulled out of the parking garage and into an available parking stall at work on friday january 24th 2020 at approximately 1:50pm. I let my car cruise into the stall while my foot is covering the brakes. Halfway into the parking stall, the car accelerated on its own. I applied the brakes but did not help. It stopped only when it jumped the front concrete stall with 2 front wheels and hit the trees then rolled back. I then immediately shift the gear to park. The day was sunny and road condition was dry. I was fortunate that it hit the trees and not other cars if I were to take this out on the road. The attached pictures shows tire marks as I am trying to brake and the tire wears.

Filed Jun 8, 2018 · Airbags, Body · 13,900 miles · PA · crash · 1 injury

When pulling into my garage, the car suddenly accelerated unexpectedly and collided with the front wall of the garage (photo 08); when I shifted to reverse, the car careened out of the garage, across the driveway, and collided with my neighbor's home (photo 09), leaving skid marks (photos 06 & 07) on the garage floor. The car was in normal electric mode at the time. I purchased the car as a certified used car on may 3rd from dave gill chevrolet in columbus, oh. There were 12,490 miles on the car at purchase and a little less than 14,000 miles as the time of the accident. I am uploading nine (9) photos.

Filed Mar 14, 2018 · Transmission · 99,700 miles · TX

Came to stop at busy intersection when the car lunged forward several times until I threw it into neutral. This unintended acceleration has happened three times since I had the car's battery serviced a little over a month ago. In addition, the car will sporadically not go into regeneration mode as it is supposed to do when coming to a stop or slowing down. This also just started happening since the battery service was performed.

Filed Sep 25, 2014 · Acceleration, Brakes · MI · crash

2012 chevrolet volt. Consumer writes in regards to brake failure and vehicle acceleration issues. *smd the consumer stated his wife had an accident. She stated the vehicle accelerated on its own, and applying the brake did not stop the vehicle. She was trying to park doing between 8-10 MPH, when the incident occurred. His wife damaged two other vehicles, and her vehicle was totaled. When the consumer arrived on the scene, he stepped on the brake pedal, and it went to the floor and a dash light on the instrument panel read booster brake needs service.

Filed Sep 25, 2012 · Electrical, Engine · 800 miles · MA

Was driving volt at low speed in traffic. Attempted to switch modes (normal to sport). This is accomplished by pressing a button on the dashboard twice in quick succession. The button is located right next to the start/stop button. I accidentally pressed the start/stop button twice in quick succession, which shuts the car off. The car shut off and I was unable to restart it until I came to a full stop, shifted the car to park, and pressed the brake. The resulted in a small traffic backup behind me. However, this the design and placement of these buttons is very poor. I believe the start/stop button has been designed to shutoff the car relatively easily in light of the recent and public "sudden acceleration" problems by other manufacturers. However, accidentally switching off the car is also an undesirable consequence. Had this event happened at higher speeds (on the highway) it could be quite dangerous.