P0001 Fuel Volume Regulator A Control Circuit/Open
What does P0001 mean?
P0001 — Fuel Volume Regulator A Control Circuit/Open. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects fuel volume regulator a control circuit/open. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0001
- Open or shorted wiring for the fuel volume regulator control circuit
- Failed fuel pressure regulator or its control solenoid
- Faulty fuel pump driver or PCM output
- Low fuel pressure reaching the rail
How to fix P0001
- Verify fuel rail pressure against spec with a gauge
- Check for a steady pressure drop when commanded
- Test the regulator control circuit for opens or shorts
- Replace the failed regulator or pump after confirming voltage and ground
- Clear the code and re-test the fuel system under load