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TPS sensor with an engine code P0123?

Tiny
RENNER13
  • MEMBER
  • 1996 CHEVROLET SILVERADO
  • 7.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 289,000 MILES
I lost my "passing gear" and ended up with an engine code P0123. After testing the TPS I found that my reference wire (grey) reads 5.05v and my signal wire (blue) is reading: starting at 4.95v and when adjusting the butterfly, it rises to 5.05. The black wire is also reading 5.05. When I disconnect the plug from the TPS the signal and black wire lose voltage. Any suggestions?
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Tuesday, July 19th, 2022 AT 3:31 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like the TPS sensor is bad. Here are instructions on how to change the sensor out in the diagrams below. It looks like it self-calibrates. Check out the diagrams (below). Please let us know what happens.
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Wednesday, July 20th, 2022 AT 1:29 PM
Tiny
RENNER13
  • MEMBER
  • 2 POSTS
I found the issue. My ground circuit back ECM was bad. No continuity from TPS to ECM. Bypassed wire, spliced into ets and all is well. Thank you for your response and your time.
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Wednesday, July 20th, 2022 AT 3:17 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.
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Thursday, July 21st, 2022 AT 10:27 AM

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