Possible causes – Faulty Throttle Actuator– Throttle Actuator harness is open or shorted= Throttle Actuator circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P2135 HONDA OBD Code Description Throttle actuator malfunction HONDA Related P2135 code 2003 HONDA ACCORD Electrical System 2004 HONDA ACCORD Electrical System