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. 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 pivot points. If the cleaning does not solve the problem, then more commonly the throttle body assembly…

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