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P0121 Diagnostic Trouble Code Discussion for February 2011

Throttle Position Sensor Does Not Agree With MAP

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Trouble Ticket Help Requests for DTC P0121
Help Request Posted
2007 Chevrolet Tahoe LT 5.3L Poor Idle Quality, MIL Lamp on VIN: 1GNFK13027
P0121: throttle position sensor performance. Vehicle came in for warning lights including mil, trac off, reduced engine power,check for tsb and none found. found noted codes, graphed scan data, found app 1 @ .94, app 2 @ .45, tps 1 @ 3.67, tps 2 @ 1.33 all at idle. Problem occurs at acceleration, depress...
February 22, 2011