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2020 Silverado revs up on its own after driving

Wojcik_81
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Wojcik_81 New Member

Wojcik_81

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I have a 2020 Silverado 1500 LTZ 6.2L 4x4 all stock except cold air intake. I live in Wisconsin. This problem started about a year ago. This problem mainly happens when it's cold outside. What happens is I can drive 5 miles or 150 miles, pulling a trailer or not pulling a trailer and it doesn't do the problem everytime but mainly after letting it warm up and then drive somewhere and I put the truck into Park. The engine will just start revving up on its own, then sometimes it will come back down to normal but almost stall out. I have over 20 some videos of it doing this problem. It also never throws a check engine light either. It has been to the dealer 5 times and they have put on over a 1,000 miles on the truck and can't get it to reproduce the problem. Then I pick it up and it does it the next day. They first blamed the cold air intake. So I put back in the stock air box and it still did it. Then they said it was my radar detector, so I took that out and still did it. They have done a reprogram and that didn't help. There was some calibrations off with the throttle body. It started in November 2020 and stopped doing it end of April and hasn't done the revving problem till couple weeks ago. GM is telling the dealer it's because I don't run Premium gas in the truck. They said it is recommended that you run 93 octane fuel. I said yes you are correct recommended but not required. I said if this was a premium fuel issue then it would do it year round not just when it's cold out. The truck was back to the dealer 4 times in the first year and documented through GM. So it can be filed under the lemon law now. The field reps say I'm the only one with this problem which I call BS. I only drive the truck on the weekends because I have a company truck during the week. So the truck right now only has just under 20k on it. I put 6k on the truck from end of April till end of November and never did it once. So GM wants me to run 4 thanks of 93 octane top tier fuel through the truck. So I filled up 2 weeks ago but haven't driven it more then 15 miles. I'm looking to see if anyone has any ideas or have had the same issues or similar problems. The link below will show the last 2 videos that was sent to GM. I have lots more if someone would like to see them.

 

https://photos.app.goo.gl/Hn6WeL1o8E9eeskd6

Edited by Wojcik_81
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  • 2 months later...
Wojcik_81 New Member

Wojcik_81

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I just wanted to post a final update.
 
So my revving problem came back in December 2021. The GM field tech came to the dealership and looked at my truck. He said they needed me to run 2 full tanks of premium top tier fuel through the truck and it will fix the problem. I said how is the premium fuel going to fix this revving. I said it says in the owners manual that premium is recommended but not required. They said that the truck with run better and the sensors are set to run premium fuel. I said okay but I bet it doesn't fix the problem. So I ran 2 tanks trough the truck and the revving was getting worse. Then the GM field tech said I needed to run 4 tanks through the truck. Well I had 3 tanks through the truck and I was planning going ice fishing 200 miles away. I told my service guy you better have a plan when I get back because its not going away. So I drove to the river and came home end of the weekend and it did its thing 6 more times. So GM flew in a GM Engineer and they did some programing to the truck. They also said they ordered a Data tracker recorder. So that next weekend the truck did the revving 5 more times. The next week the Data Tracker came and the GM Engineer flew back and put it in. He said he would like 2 recordings if I could before he came back. I had a button I had to push when it would start to rev on its own. I also had to let the dealership know the date and time I pushed the button. Well it did it 5 more times that next weekend. So the GM Engineer flew back and read the data. He told the dealership to order and change out the gas pedal. So as soon as they got it, I got the truck to them and they put it in. They also left the data tracker in the truck. I thought there is no way this is going to fix the problem. Well after 3 weeks it hasn't done it once. So last week they took out the Data Tracker. So I am hoping this problem is fixed. Took 2 years to get figured out and fixed. The dealer told me they would of never guessed it was the gas pedal. 
 
So the problem wasn't my K&N cold air intake, Radar detector, Phone charging cords, and defiantly not the regular gas I was running. It was the gas pedal that was bad. I have put everything back in the truck and running regular gas again.
 
I thought I would let everyone know the problem that it ended up being. Hope this helps out someone else that might have the same problem.
mikystyle Enthusiast

mikystyle

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Posted

What a hassle. I’m experiencing an issue with my Speedo randomly fluctuating rapidly. Not the same as what your issue was but hoping I don’t have to go through a similar experience to have it remedied. I have a thread on the front page of this forum with a video no one’s chimed in yet. I haven’t taken it to the dealership yet.

Wojcik_81 New Member

Wojcik_81

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If it is under warranty I would take it in. The dealership put almost 1500 miles on my truck and they could never get it to do the revving. I recorded a video everytime it did it. After I had it to the dealer 4 times in the first year I had to contact GM customer service and a file was opened on my truck. So make sure you document everything in case you have to get a lawyer involved. I was very close to filing the truck under the lemon law. GM won't let you do it because it makes them look very bad. They will make it right any which way. I bet my truck was at a dealership a total of 8-10 times and spent weeks there. You just have to do what they tell you to do and when it doesn't fix the problem to video and document it all. I wish you the best of luck. I have very little faith that they were going to get it fixed. They were very helpful the whole way but it was a pain the whole time.

 

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