Fault code P1577 – a step-by-step guide to diagnosing and fixing it

Error code P1577 is displayed and the check engine light is on - what does this mean?

The DTC P1577 is recognized by the OBD system if there is a problem with the pedal position sensor (PPS) or the accelerator pedal sensor. This manufacturer-specific error code occurs when the control unit detects a malfunction in the accelerator pedal position system. This code can have slightly different meanings for different manufacturers, but usually refers to the accelerator pedal position.

What causes can this error code have?

• Defective accelerator pedal position sensor (PPS)
• Damaged wiring harness to the accelerator pedal sensor
• Corroded or loose plug connections on the gas pedal pedal
• Dirt or mechanical blockage in the accelerator pedal area
• Defective throttle valve control
• Faulty power supply to the sensor
• Short circuit in the sensor wiring
• Defective engine control unit (ECU)

What symptoms occur in parallel with fault code P1577?

• Engine performance problems: Reduced engine power or irregular idling
• Accelerator pedal response: Delayed or no response to accelerator pedal operation
• Emergency running mode: Vehicle switches to emergency running program with limited speed
• Starting problems: Difficult starting or irregular engine running
• Jerking: Engine jerks when accelerating or idling
• Stalling: Engine stalls while driving or idling

How can you fix the problem with error code P1577?

• Repairing EOBD error code P1577 requires a systematic diagnosis of the accelerator pedal control.
• Replace the accelerator pedal position sensor completely and have it recalibrated
• Check the wiring harness to the accelerator pedal sensor for damage and replace defective cables
• Clean the plug connections on the accelerator pedal, replace corroded contacts and connect firmly
• Remove accelerator pedal unit, clean mechanical parts and replace completely if worn
• Check the throttle valve control and replace the entire throttle valve housing if defective
• Measure the power supply to the sensor and replace defective fuses or relays
• Check wiring for short circuits and completely replace damaged wiring harnesses
• Diagnose the engine control unit and have it professionally replaced or repaired if defective