Mechanics

CODE P0121 SERVICE ENGINE SOON LIGHT

1997 GMC Safari • 6 cylinder 2WD Automatic • 189,000 miles

Po121 code for 1997 gmc safari what do I need to fix for this code to disappear?
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Rocket2220
February 27, 2011.




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.

Wrenchtech
Feb 27, 2011.
What is a TPS circuit

Tiny
Jmcglone
Mar 4, 2011.
It's everything in the system that has anything to do with the TPS.
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Wrenchtech
Mar 4, 2011.

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