1997 gmc safari code p0121 service engine soon light

1997 GMC SAFARI
189,000 MILES • 6 CYL • 2WD • AUTOMATIC
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ROCKET2220
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  • 1 POST
po121 code for 1997 gmc safari what do i need to fix for this code to disappear?
Feb 27, 2011 at 6:39 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 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.
Feb 27, 2011 at 7:29 AM
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JMCGLONE
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what is a TPS circuit
Mar 4, 2011 at 1:19 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
It's everything in the system that has anything to do with the TPS.
Mar 4, 2011 at 1:21 PM
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