K 3500 Truck 4WD V8-454 7.4L VIN J SFI (1996)
Throttle Position Sensor: Testing and Inspection
When the VCM detects a malfunction with the Throttle Position (TP) sensor circuits, the following Diagnostic Trouble Code (DTC)s will set:
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DTC P0121 circuit performance
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DTC P0122 circuit low.
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DTC P0123 circuit high.
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DTC P1121 intermittent circuit high.
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DTC P1122 intermittent circuit low.
Refer to Diagnostic Tables. See: Computers and Control Systems/Testing and Inspection