Skip the auto shop - Our mechanics make house calls

Q: After releasing gas pedal, car continues to accelerate

asked by on

On a four-lane highway, I was in the right lane and moved into the left lane, accelerating under full throttle to pass a car. After passing it, I moved back to the right lane and when I released the gas pedal, the car kept going - it just kept accelerating! I pressed and depressed the full range of the pedal to make sure that it was free to operate, but that didn’t make any change. At wide open throttle, it was stuck. As hard as I could, I then put full pressure on the brake to try to slow the car down as it was continuing to accelerate. I could tell brake failure was imminent because they were getting hot. I shifted the transmission selector up to Neutral. After the engine momentarily overran to the rev limiter, it then settled to 4000 rpm. While it was in Neutral, I continued to press on the brakes to stop. It did stop and after 30 seconds the engine slowed to a normal level of idle. The throttle seemed to respond normally. After shifting to Drive, I headed to the dealership. Around 30 seconds after starting to the dealership, the “grade braking on” appeared and then went off. It was a flat road and I was going 20 mph and not pressing on the brake pedal. The tow/haul mode was not on. Before I agree to what the dealership finds, would you please diagnose all of this and give me your advice? Thanks.

A: Hey there. From your description, it sounds...

Hey there. From your description, it sounds like the throttle body became stuck. Since this vehicle does not have a throttle cable, it is possible that a sensor malfunctioned and caused the throttle to stay on. These vehicles have been known to break the gears inside the throttle body and cause the symptoms you described. It is possible that the throttle body may need to be cleaned or replaced. Also, in the future, if the throttle sticks, the best course of action is to simply turn the ignition off. Don’t turn it all the way back, because that would lock the steering wheel. Only turn it back one position to the accessory position. If you would like to have a professional outside of the dealership inspect the stuck throttle, a certified technician from YourMechanic can come to your car’s location to give your Chevy a look.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: The car accelerates with delay

Hi there. This can be caused by a number of things. Since the dealership installed a scan tool and didn't see any codes then it must not be a sensor failure. I typically start by checking the back pressure of...

Q: Car shakes when accelerating from 1st gear - 2001 Nissan Pathfinder

Hello. If your vehicle is shaking when accelerating from first gear, and not shifting into overdrive or the higher gears, then there is likely some sort of issue with the transmission. A few things that can cause these symptoms are...

Q: Limp mode 30 codes

Hello there, when you see that many codes it can take some work to sift through all of them. Usually only a few codes will remain once the codes are cleared and the vehicle is driven. These remaining codes will...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.