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1997 GMC Safari code P0121 service engine soon light

Tiny
ROCKET2220
  • MEMBER
  • 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 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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
  • 1 POST
What is a TPS circuit
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Friday, March 4th, 2011 AT 9:19 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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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