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P1221 Diagnostic Trouble Code Discussion for July 2009

TP Sensor 2 Signal Correlation

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Trouble Ticket Help Requests for DTC P1221
Help Request Posted
2003 GMC Envoy SLT 4.2L MIL Lamp on VIN: 1GKDT13S73
P1221: TP Sensor 2 Circuit Malfunction. ... with codes p1221 p1271 and p1481. the code can be cleared and normal engine operation will resume for up to a couple of days. vehicle will also intermtitently cruise at 40mph. without accelerator being touched. of course th...
July 02, 2009
2003 Chevrolet Trailblazer North Face 4.2L Hesitation, Surge, MIL Lamp on VIN: 1GNET16S53
P1221: TP Sensor 2 1-2 Correlation. I just replaced the PCM in hopes this would clear up the problem,But It didn't. The 5 Voltage problem is the culprit. Using My DVOM and the 5 volt Pin,coming from the PCM it will vary from 3.00 volts to 4.50 volts,Can't find anything else wrong,Just the varyi...
July 25, 2009
2000 Honda Passport EX 3.2L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 4S6CK58W7Y
P1221: Throttle Position Sensor 1-2 Circuit Performance. this truck has been to 2 dealerships and 1 other independent shop. the problem is after a stint of driving the truck looses power and starts to miss the codes listed are the only ones that show up the low voltage code is from a faulty alternator. the problem i...
July 27, 2009