P0122 code

2000 PONTIAC GRAND PRIX

102,395 MILES • 6 CYL • FWD • AUTOMATIC

SHANERBJ

MEMBER
2 POSTS

I have a 2000 Pontiac Grand Prix and am getting a P0122 code. The scan tool indicates 0% for the TPS for all throttle positions (engine off and on). Voltmeter checks at the TPS indicated normal operation of the sensor. Where do I go from here with troubleshooting? Also, the transmission shift points have increased significantly. Shift point for 1-2 is 35 mph. Could these problems be related?

Nov 14, 2010 at 12:16 AM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

Hello,

This sounds like there is a connection problem between the TPS and the PCM please use this guide and there engine wiring diagrams to troubleshoot the problem and get back to me.

https://www.2carpros.com/articles/how-to-check-wiring

Here are the engine wiring diagrams(below)

Check out the diagrams (Below)

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Nov 14, 2010 at 12:27 AM

SHANERBJ

MEMBER
2 POSTS

Great guide! I found one of the terminals had pulled out of the connector for the TPS all fixed thanks !

Nov 15, 2010 at 12:10 AM