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P1221 Diagnostic Trouble Code Discussion for July 2007

TP Sensor 2 Signal Correlation

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Trouble Ticket Help Requests for DTC P1221
Help Request Posted
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on, LOW POWER MODE VIN: 1GNDT13S22
P1221: TP Sensor 2 1-2 Correlation. ... Trail Blazer that presented a week ago with a check engine light and a low power light on. The vehicle would not accelerate. Several codes were found all relating to the TAC module (Throttle body) I don't remember what the codes were, but the problem was n...
July 10, 2007
1998 Chevrolet Corvette 5.7L MIL Lamp on, Loss of Power Light VIN: 1G1YY22G0W
P1221: TP Sensor 1-2 Signal Correlation. This car runs great! Allegedly has 560hp, until the Loss of Power message and MIL come on, then its all over. Customer says it ran great for 1 1/2 years after superchager was installed. I have had it come on for me at start up and on decel after several good r...
July 23, 2007