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Hi! I have a two month old 2019 bolt premier. One day in September I had a scary issue. I was alone in the morning in town I just fast charged it at a mall. My wife and two sons were visiting my wife’s sisters new baby. In town at 50 kms per hour I let the accelerator pedal off. I like driving it in one pedal mode. (L). It momentarily hesitated. I realize if it’s fully charged it doesn’t decelerate until I have used some battery power. I had been disconnected by a rude fellow at the mall. He said I should have disconnected it at 80 percent. So he did it for me then plugged his car in. I was getting a gift for the new baby so didn’t think of it as being a problem for any one that I was not out there. Any way I was only at 87 percent charge. I thought maybe it had to much charge and that’s why it didn’t decelerate. But in the back of my mind it wasn’t normal. Then I picked the family up and we headed home. A drive of three hundred kilometres. We were 20 minutes out of town on an expressway. I had the cruise on and I thought it was set at 103 Kms per hour. My wife said I was at 108. I was in the slow lane, and a Tesla pulled up beside my in the fast lane. He stayed there without passing and a long line of cars were behind him, wanting by. So I decided to accelerate so he would get in the slow lane behind me and everyone could get by. I jumped to 123 quickly and then let off. At this point I released the pedal. But it didn’t slow down. It kept accelerating. I hit the brake and it slowed down momentarily but went back up as soon as I let go of the brake. Then I told my wife I am not doing it. The boys starting screaming for me to slow down. I tried braking hard, I tried disconnecting the cruise control. I tried lifting the accelerator pedal with my toe behind it and bringing it back to an off position. It didn’t work I was now doing 140 Kms per hour and had both hands on the steering wheel as I was trying to stay in control. I decided I would just have to brake until they gave out and hope. Unknown to me my wife who is smarter then me. Pushed it into neutral. So I braked hard and came to a stop thinking it was me. But I think she saved us. When we stopped it was smoking I thought we might be on fire and told everyone to be ready to jump out. I got out, and looked it over and it was the brakes smoking nothing else. I called onstar for a diagnosis and they said everything was ok. I called the local Chevy dealer in the town twenty minutes back and they said they can’t help they don’t work on them. Only in Toronto is there a dealer who does. That’s where I got it. I tried calling them but they weren't available at the time. So I talked it over and my wife said she put it in neutral. So we tried driving it again slowly and exited the highway. Everything worked fine. So we tried a few other things incase it did it again. To make sure we could stop it and it always stopped. So we limped slowly home at first eventually I got it up to 100kms per hour again it never reappeared. We took it to the dealer we bought it from they kept it for two weeks and said they couldn’t find anything wrong with it. They said maybe my foot got on both pedals at the same time. I know that’s not the case as when I let off the brakes it rocketed back up to a high speed.
I guess in telling this story I hope I can give others who might encounter it, a heads up. Two pushes towards the dash board on the gear shift puts it into neutral. It was a good lesson I am glad my family is alive. I am thankful my wife was there. Any constructive thoughts would be appreciated. And no it wasn’t the floor mat.
 

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This story is written in some interesting prose. Maybe it’s because he is Canadian.

So how about some new details? What do you mean, you tried “disconnecting” the cruise control? Hitting brakes does that. Did the cruise control light say it was on?

You said you tried lifting up the accelerator. Was it stuck down or was it sprung back up and (of course) wouldn’t lift up any more. Did you try tapping or pushing on the accelerator and releasing again (like a jab)?
 

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Yes. Indeed. I am not exactly sure if that was my response. Until that moment I thought it was the best vehicle I have ever had. Now ,I still think it’s amazing but with great caution.
My personal opinion. We were some how hacked. The mechanic says that’s slmost impossible. But my iPhone SE was plugged into the USB port by the shifter. After the incident my phone wasn’t working. I had to do a hard reboot to get it to work again. That hasn’t happened before. I did mention it to the mechanic but they dismissed it.
 

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In response to the cruise control I tried disconnecting it on the steering wheel. By pressing the off button. I am unsure if I saw whether the green cruise light was illuminated or if it was white, and off. But The brake application should have disconnected it. The accelerator pedal was all the way up as far as I could bring it with my foot. I did not try stepping on it again to free it. It seemed to be sending a max down pedal signal to the engine because when I released the brakes the car accelerated rapidly up to the 140 km per hour. Hey the truth is I was scared,and tried my best to troubleshoot it but I obviously missed things, like shifting it to neutral.
 

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Never heard of this before. Having worked on some other GM throttle position sensors (but not the Bolt), they normally have two variable resistors and when one doesn't agree with the other, it throws a code. So if the mechanical armature that drives the resistors got stuck, given that it is spring-loaded, it may not pop back even if you lift the throttle with your foot. If the mechanical part has a catch in it somewhere, it is possible it could happen again when you enter that area of throttle position. If, for example, there's a catch at the 65% throttle position, it might not stick unless you get the throttle to 65% and then slowly release the throttle at that point. I hope the dealer at least monitored it on a scan tool while trying various throttle positions to be sure it isn't sticking anywhere.

If it were my car, I think I'd get an OBDII scanner and test throttle positions: I think you can do that while the car is in park. Move the throttle to 5%, then slowly release. Next, move it to 10%, then slowly release. Keep going until you get to 100%, seeing if it is slow to release or catches at any position.

Mike
 
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