P0001
PowertrainFuel Air Meteringmoderate severityFuel Volume Regulator Control Circuit/Open
What P0001 Means
The PCM detected an open circuit in the fuel volume regulator control circuit. This regulator controls fuel pressure in the high-pressure fuel system.
Symptoms
- Check Engine Light
- Hard starting
- Reduced power
- Poor fuel economy
Common Causes
- Faulty fuel volume regulator
- Damaged wiring or connectors
- PCM failure
- Corroded terminals
Diagnostic Steps
- Read freeze frame data
- Inspect wiring to fuel volume regulator
- Test regulator resistance
- Check fuel pressure
- Test PCM output
Where to start: Replace faulty fuel volume regulator or repair wiring.
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