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2011 Duramax Throttle sticking

7.5K views 17 replies 8 participants last post by  KensAuto  
#1 ·
I was driving around 45 mph today and let off the accelerator but notice my RPM was still hanging around 1600 RPMs. Usually my RPM drops immediately to around 800RPM (idle) when letting off the accelerator. I checked to make sure nothing was causing the pedal to be stuck. Nothing. I put the truck in neutral and the rpm slowly climbed to over 2000 rpm. I continued driving and the throttle was sporadic. Sometimes it would act normal and return to idle and other times it would slowly accelerate. I recently changed my NO2 sensor, replaced air filter with a Banks CAI and my fuel filter is due a change.
Anyone experience this or have possible solutions?
I will drop it off at GMC dealer Monday if they open.
:help
I have not installed H&S programmer yet
 
#4 ·
Thanks TakEm for the recommendation I didn't know this truck had an Acceleration Pedal Position Sensor until I did some more research. Unfortunately this thing has 40,000 miles so this will be on my tab.
 
#6 ·
Actually I'm a little concerned driving the truck. If this accelerator sensor puts me in a full throttle situation I'm screwed and so is everyone around me. Is anyone out there knowledgeable on this pedal position sensor? Could it inadvertantly sense pedal position as full throttle? I'm considering having it towed in. I will talk to the mechanic and seek further guidance.
 
#7 ·
My dealer would still cover that under warranty, will yours do the same? If so, asking them to come pick up the truck would be my first choice. It would be the same as them giving you a ride back home after dropping it off. :thumb

Your worry does have some merit. If my truck ever behaved like that on black ice, it would surely injure or kill someone.

Unrelated, but the throttle cable in one of my Suburbans snapped on the HWY after a day of wheeling. Of course it happened at WOT while merging. LOTS of brake, a quick shift into Neutral, turned the key off and went rifling through my bag for spare pants.
 
#8 · (Edited)
the sensor actually has a set of 2 sensors for redundancy (spelling?)...if they don't match programmed values it will put the truck into 'reduced power' and throw a code instantly. If the lights not on, chances are it's an internal pcm issue (i.e. programming)

...and I suppose there could be an issue of extra fuel entering the cylinders but I would suspect the pcm would detect the higher idle and still throw a code
 
#9 ·
You don't have any kind of rug on the floor to get caught up in the pedal do you?
 
#11 ·
Thanks for input guys. It wouldn't be my first time throwing a vehicle into neutral and turning the truck off then back to ACC to keep my steering. This thing is governed to 96mph right? I should be fine until I get off the exit. Lol.
I'll send GM my speeding ticket.
 
#14 ·
I triple checked to make sure the cruise was not on.
 
#15 ·
Update. On my way to dealer the idle was high for a while but when I was driving the last cole miles the problem went away. When I got to the dealer they could not duplicate the problem. They can't fix it if they can't find anything wrong. They said they need more time to check all the wires. On my way home I called another dealer. Remember I said I had not changed the fuel filter yet and I just added a a Banks CAI? He immediately said the CAI was the problem. He has had two previous customers with the same issue and went back to factory and resolved the problem. The problem was not Banks specific. I will recheck to make sure the the sensor is not loose and has a good seal.