2003 GMC Sierra 2500 P0120 P2135

2003 GMC Sierra 2500 P0120 P2135

GMC Sierra On the 2003 GMC Sierra, the P0120 and P2135  are both pointing to a problem with the throttle position sensor. On this vehicle, the throttle position sensor is built into and part of the Throttle Body assembly. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. If no problems are found, many time a good cleaning can solve this problem. Using some throttle cleaner and a toothbrush and shop rag, try to clean as much build-up from the throttle bore, plate, and plate…

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