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P0120 Diagnostic Trouble Code Discussion for September 2010

Throttle Position Sensor Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0120
Help Request Posted
2006 Chevrolet Silverado 2500 HD LS 6.0L Reduced power VIN: 1GCHC29U26
P0120: TP Sensor 1 Performance. ... codes p2135 and p0120 for the last few months intermittenly. Then the reduced power message would be displayed. We installed a new Delco throttle body, and Delco connector then reflashed the pcm. Still intermittenly but not new as frequently. Any help with...
September 27, 2010