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P1221 Diagnostic Trouble Code Discussion for June 2009

TP Sensor 2 Signal Correlation

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Trouble Ticket Help Requests for DTC P1221
Help Request Posted
2001 Chevrolet Express 3500 8.1L MIL Lamp on, No throttle VIN: 1GBJG31G71
P1221: TP Sensor 2 Signal Correlation. We have been wrestling with this beast for a long time! As you can see in history, we or another shop have replaced almost everything to try to fix this. The problem is very random. You will be driving along and the "reduced power" light will come on a...
June 22, 2009