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P0123 Diagnostic Trouble Code Discussion for November 2006

Throttle Position Sensor/APPS High

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Trouble Ticket Help Requests for DTC P0123
Help Request Posted
1999 Chevrolet Express 3500 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCHG35R9X
P0123: TP Sensor Circuit High Voltage. The check engine light just came on prior to the running problem which is it stalls out, runs rough or the vehicle will all of a sudden idle at 3000 rpm. When you step on the throttle she will pop back slightly and bog down. MAP checks out at 2.7 to 3.7 volts ...
November 14, 2006