Fault code P0001 – a step-by-step guide to diagnosing and fixing it

Error code P0001 is displayed and the check engine light is on - what does this mean?

The OBD system has detected that there is an open circuit in the fuel volume regulator control circuit. This DTC P0001 mainly affects the fuel system and fuel pressure regulation, which affects the optimum fuel supply to the engine. Different manufacturers may have slightly different names for this fault code, but it always refers to problems with the fuel volume regulator.

What causes can this fault code have?

• Defective fuel volume regulator
• Damaged wiring to the fuel volume regulator
• Corroded or loose plug connections
• Defective fuel pump
• Faulty engine control unit (ECM/PCM)
• Interrupted ground connection
• Defective fuel pressure sensor
• Clogged fuel filter

What symptoms occur in parallel with fault code P0001?

• Starting problems: The vehicle is difficult to start or does not start at all
• Loss of power: Significantly reduced engine power while driving
• Unsteady idling: Engine runs unevenly at idle speed
• Jerking: Vehicle jerks, especially when accelerating
• Increased fuel consumption: Significantly higher consumption than normal
• Engine switches off: Engine switches off while driving

How can the problem with error code P0001 be rectified?

• Repairing this EOBD fault code requires a systematic approach to identify the cause.
• Replace the fuel volume regulator completely and check the electrical connections
• Check all cable connections to the fuel volume regulator for damage and replace defective cables
• Clean plug connections, check for corrosion and replace if necessary
• Test the fuel pump and have it completely replaced if defective
• Diagnose engine control unit and reprogram or replace if necessary
• Check and restore the ground connections of the fuel system
• Replace fuel pressure sensor and measure fuel pressure in the system
• Replace the fuel filter and flush the entire fuel system