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No high end acceleration, code P0123

Tiny
ELDEN BUTLER
  • MEMBER
  • 2006 CHEVROLET SILVERADO
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 167,000 MILES
My truck started running rough after a big rain, I had it scanned for check engine light the code that popped up was p0123 which was throttle position sensor high voltage. I changed the TPS and IAC, also changed my air filter and and cleaned the throttle body. Still I can't go over 50 MPH unless down hill. I have no take off or passing acceleration. What could be the issue?
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Thursday, July 1st, 2021 AT 2:57 PM

1 Reply

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

Here is the information you requested. Here is a tutorial showing how to test electrical wiring:

https://www.2carpros.com/articles/how-to-check-wiring

I've attached below picture diagnostic steps for the code P0123 relating to the throttle position sensor. This is like a flowchart for diagnosing this code in its entirety. Let us know what you find and we'll go from there. Hope this helps and thanks for using 2CarPros.
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Thursday, July 1st, 2021 AT 8:01 PM

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