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P1221 Diagnostic Trouble Code Discussion for November 2006

TP Sensor 2 Signal Correlation

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Trouble Ticket Help Requests for DTC P1221
Help Request Posted
2000 GMC C6500 7.4L MIL Lamp on VIN: 1GDJ7H1D3Y
P1221: TPS 2 value not matched with TPS 1 value. This truck illuminates MIL w/ P1221 and P1120; also will default to limp-in and illuminate "POWER LOSS" light when code sets. I have very limited data for this vehicle. What I do have tells me that P1221 must be addressed first. Neither of my scanner...
November 27, 2006