P2135 GMC Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

Possible causes

– Faulty electric throttle control actuator (TP sensor 1 and 2)
– Throttle Position Sensor harness is open or shorted
– Throttle Position Sensor circuit poor connection
– Faulty accelerator pedal position sensor

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P2135 GMC OBD Code Description