Fault code P1573 – a step-by-step guide to diagnosing and fixing it

Error code P1573 is displayed and the check engine light is on - what does this mean?

The DTC P1573 is recognized by the OBD/EOBD system when there is a problem with the fuel pump relay control. This manufacturer-specific fault code mainly affects the fuel system and the electrical control of the fuel pump. The exact definition of this trouble code may vary slightly for different manufacturers.

What causes can this fault code have?

• Defective fuel pump relay
• Damaged wiring to the fuel pump relay
• Loose or corroded plug connections
• Defective fuel pump
• Faulty engine control unit (ECU)
• Blown fuse in the fuel pump circuit
• Poor ground connection in the electrical system
• Defective fuel pressure sensor

What symptoms occur in parallel with fault code P1573?

• Starting problems: The vehicle is difficult or impossible to start
• Engine misfires: Irregular engine running while driving
• Loss of power: Reduced engine power during acceleration
• Jerking engine: Unstable idling and vibrations
• Stalling: Engine stalls while driving or idling
• Fuel smell: Unusual smell of gasoline in the engine compartment

How to fix the problem of error code P1573?

• Repairing this EOBD fault code requires a systematic approach to diagnosis and rectification.
• Replace the fuel pump relay and check and clean all electrical connections to the relay
• Check wiring between engine control unit and fuel pump relay for damage, breaks or short circuits and replace defective cables
• Test the fuel pump and replace it completely if necessary, including checking the fuel pressure
• Check fuses in the fuel pump circuit and replace blown fuses
• Clean and tighten ground connections in the fuel system to ensure proper electrical connection
• Diagnose the engine control unit and have it replaced or reprogrammed in the event of irreparable faults