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P0121 Diagnostic Trouble Code Discussion for April 2010

Throttle Position Sensor Does Not Agree With MAP

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Trouble Ticket Help Requests for DTC P0121
Help Request Posted
2007 GMC Sierra 1500 SLT 5.3L Poor Idle Quality VIN: 2GTEK13M17
P0121: TP Sensor 1 Performance. Hi everyone . Just replaced a throttle body on this GMC and now it will not return to idle properly - after i clear the system it will start and idle down -relearn is to run for 3 minutes and off for 1 min. - the second time i start it it will go to 1200 rpm a...
April 08, 2010