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My car will accelerate on its own, randomly, without warning.
2005 Buick Rendezvous

My car will accelerate on its own, randomly, without warning.

(2005 Buick Rendezvous)
It's almost like the cruise control gets turned on. I can be driving through town and it randomly starts accelerating. I'll pull in the nearest parking lot, put it in park, which will immediately shoot the RPM's up to 3000. If I turn the car off, sometimes that helps immediately, sometimes it takes a few minutes of waiting. My speed doesn't seem to make a difference, happens a few times a month.It, obviously, makes stopping slower as well. I've taken the car in to 4 different places (and spending over a grand I couldn't afford) and nobody can find anything wrong. They can't recreate the problem, of course, and act like I'm crazy when I'm trying to explain it.
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5 answers & 3 comments
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on November 01, 2016
Dmb32 id say yep it sounds like they r all morons .any mechanic should know if u say the accelerater is doing its thing on its own then it would obviously be something to do with or around the throttle .meaning that and the cruise control would come to mind right off for them to dsay its not possible yea theyr full of it ..but i do have a question .im wondering if it has anything to do with my cruise control giving me so much hell to activate ? I also read on a site that if you dont turn ur control to the off position then its possible for it to activate at any given time ..which is crazy bcuz i never think to switch mine off ..my 2004 has a couple of times while stoooed at a redlight like gun up on it own like it was gona take off but of course i press harder on the brake and it just went away ..This seems extremely dangerous .its got to be an error in workmanship /faulty construction.but do we think they will aknowledge this BEFORE something tragic occurs
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General Diagnosis
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on November 01, 2016
Dmb32 id say yep it sounds like they r all morons .any mechanic should know if u say the accelerater is doing its thing on its own then it would obviously be something to do with or around the throttle .meaning that and the cruise control would come to mind right off for them to dsay its not possible yea theyr full of it ..but i do have a question .im wondering if it has anything to do with my cruise control giving me so much hell to activate ? I also read on a site that if you dont turn ur control to the off position then its possible for it to activate at any given time ..which is crazy bcuz i never think to switch mine off ..my 2004 has a couple of times while stoooed at a redlight like gun up on it own like it was gona take off but of course i press harder on the brake and it just went away ..This seems extremely dangerous .its got to be an error in workmanship /faulty construction.but do we think they will aknowledge this BEFORE something tragic occurs
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on August 01, 2011
Get your car in to a shop ASAP, this is VERY DANGEROUS, sort of like what was happening to Toyota, you could hurt your self or some one else. This is a problem with the electronic throttle control system.

here are some shops:

https://repairpal.com/buick-repair-in-galesburg-illinois
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on August 08, 2011
For anyone with the same problem, I finally got it fixed. My boyfriend figured out it was the idle air control valve, the spring-like part of it had gotten stuck completely extended. All that trouble and money, and it ended up being a $31.00 part that took less than a half hour tofix. Whew!
on December 16, 2015
what year is your car? I have a 01 that is accelerating on its own.
on December 04, 2014
Hi, since you fixed the problem with acceleration, are you still having a problem? My car is accelerating and so far my bill is at $629 and they still can't find the problem.
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on August 02, 2011
i been having the same problem with my rendezvous and i called to see if there was a recall and nothing so have you found out what is wrong yet?
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on August 02, 2011
Every place I've taken it to has said it's probably a bad idle air control or a gross vacuum leak..before they actually check out the car. After they've looked and fiddled with it and charged me an arm and a leg, they say there is absolutely nothing wrong with my car. One actually asked if maybe I just didn't realize I was pushing on the accelerator. I told him when it happens, I take my foot off off the gas and it still accelerates.The mechanic said that wasn't possible. I don't know if all of the mechanics in this town are morons or what.
on July 12, 2018
I used to have an 03 Rendezvous and never had an issue. Now I just bought an 06 from my mechanic of all people and I got on the highway and noticed it would do like little power surges. It felt like those people that accelerate and let off then accelerate and let off which seriously makes me nuts! LOL!!! I did take video, the RPM needle would go up slightly then back where it was. It's not constant but I did notice any speed over like 60-65mph. Cruise control or not. I read your comment below about it being the idle air control valve which is a relief. Thank you!
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