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Throttle Position Sensor problems

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#1 arreis1002



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Posted 20 June 2012 - 11:00 AM

I have a 2001 GMC Sierra 1500 4.8L

I have had the same issue multiple times now. If I let the truck idle

for any length of time, especially when the weather hot, it goes into

"Reduced Engine Power" mode and I can do nothing but limp to the side of

the road. I have taken it to my local mechanic (who I've used for over

20 years) and each time it throws a TPS failure code. My mechanic is at

a loss as he's never seen this happen before and it has happened 4 or 5

times to me. The TPS has been replaced each time.

Any ideas?

#2 Duelin



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Posted 20 June 2012 - 09:05 PM

Check the Neg. battery cable to make sure it is tight(at the battery and at the engine) . Also check all your ground wires on the engine to make sure they are tight.

Edited by Duelin, 20 June 2012 - 09:11 PM.

#3 govtech4


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Posted 22 June 2012 - 09:08 PM

that message means there is a code in the ECM ,,,,

it needs to scanned by a competent tech .....not the guy you have ,he is out of the loop as far as technology goes and service information,

get a different corner garage tech or take it to a dealer for a diagnoses and stop throwing TPS's at it

again,you guys have to read the owners manual !!!!
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