This issue is called unintended acceleration. First and foremost, I would report this to GM. I doubt they will do much due to the age of the vehicle but if this turns out to be what it is then they need to be notified.
Next, we need to rule out the possibility that you are accidentally pressing the brake and the accelerator. If there is a chance that your foot is not fully on the brake pedal but hanging off the edge, then the edge of your shoe could depress the accelerator as well. This is a common cause of this even if you are not aware of it.
Then the next thing is do you have floor mats? If so, remove them until we figure out what is going on. If it doesn't do it with the floor mat out, then that was likely causing the pedal to stick. Again, this is a common cause of this as well.
We need to rule those out so that all we are left with is a mechanical/electrical issue.
The last thing we need to do is capture the voltages of the throttle control actuator which this is happening. If the PCM is commanding this, then that can cause the engine to race but we need to start here.
https://www.2carpros.com/articles/how-to-check-wiring
The other possible cause of this would be the pedal itself. That was the cause of the Toyota issue where the cars were accelerating on their own. So, we have to start by getting some info so that we are not just replacing parts because that can get expensive. However, we are looking at a pedal, PCM, or throttle actuator issue.
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Tuesday, May 10th, 2022 AT 5:25 PM
