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P1221 Diagnostic Trouble Code Discussion for August 2011

TP Sensor 2 Signal Correlation

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Trouble Ticket Help Requests for DTC P1221
Help Request Posted
2001 GMC Yukon XL 1500 Denali 6.0L Hesitation, MIL Lamp on, reduced engine power VIN: 3GKGK26G61
P1221: TP Sensor 2 Signal Correlation. ... on. codes p1220 and p1221. another one of our techs replaced the tps on the throtle body 2 times. came back in with the same 2 codes and this time i drew the short straw and got to get my hands in this thing. found a coup...
August 19, 2011