Throttle pedal position sensor -P0121

[Plimbob]

I have a 2007 Tahoe 5.3L that I am getting a P0121 code - throttle position sensor A circuit range/performance intermittent.

Anyone have experience with this issue?

 

[ChampagneMurder]

Yes, I had the same issue, I replaced the throttle position sensor and the pedal assembly, and it was still throwing the P0121 CEL. Took I to a dealer here in SoCal and they said it needed a new throttle body and a couple hours time to reprogram the ECU. For around $800. I took my truck from them took the throttle body off and have it a through cleaning performed the idle learn procedure and I have not had an issue since. Start off by cleaning the throttle body, it may save you a couple hundred bucks. If you need any additional help, let me know.

 

[MO Viet Vet]

Good call. Get some MAF cleaner at the parts store and clean the MAF, also.

 

[ChampagneMurder]

Scared the **** out of me when I reassembled the intake and started it the first time, it idled at about 3k rpm!

 

[MO Viet Vet]

Relearn.

 

[ChampagneMurder]

Already did that.. But thanks

 

[MO Viet Vet]

No, what I am saying is that it was relearning. Sorry for confusion.

 

[ChampagneMurder]

Oh yeah, it definitely took a little time for it to learn where it should be idling.. But no more CEL's!

 

[MO Viet Vet]

Yea, if you have never seen it happen before it can make you think you did something causing it to be messed in a different way.

 

[Plimbob]

Thanks everyone for the input. I did clean the Throttle body and and the MAF. It helped.

Tim