1997 GMC SAFARI CODE P0121 SERVICE ENGINE SOON LIGHT

  • Tiny
  • rocket2220
  • 1997 GMC Safari
  • 6 CYL
  • 2WD
  • automatic
  • 189,000 miles

Po121 code for 1997 gmc safari what do I need to fix for this code to disappear?

Sunday, February 27th, 2011 AT 2:39 PM

3 Answers

  • Tiny
  • Wrenchtech
  • Expert
  • 19,541 posts

That's indicating a problem in the TPS circuit somewhere. It could be the sensor itself, the throttle body, the PCM or any related wiring. It would have to be troubleshooted.

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Sunday, February 27th, 2011 AT 3:29 PM
  • Tiny
  • jmcglone
  • Member

What is a TPS circuit

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Friday, March 4th, 2011 AT 9:19 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,541 posts

It's everything in the system that has anything to do with the TPS.

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Friday, March 4th, 2011 AT 9:21 PM

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