P1574 P1574 OBD Code Definition: P1574 Stoplamp Switch Circuit P1574 OBD Code Description: OBD Code P1574 Stoplamp Switch Circuit OBD Code P1574 Accelerator pedal position (APP) sensor output disagree OBD Code P1574 Throttle position sensor Disagreement between sensors OBD Code P1574 Left Eng. Mount Solenoid Valve Electrical fault in circuit