P0001 indicates that the Powertrain Control Module (PCM) has detected an open circuit in the fuel volume regulator control circuit. The regulator, which adjusts fuel pressure based on driver demand, is not receiving a proper signal.
Corrosion, broken wires, or a loose connector can interrupt the signal from the PCM to the regulator.
The regulator's internal coil or valve may have failed, causing an open circuit condition.
A fuse that has opened will cut power to the regulator, producing the same symptom.
A poor PCM ground or a malfunctioning power feed can mimic an open circuit.
Only after ruling out wiring, regulator, and fuse issues should a PCM defect be considered, as it is an uncommon cause.
In most cases no. The PCM is rarely at fault; wiring, connectors, fuses, or the regulator itself are far more common causes. Replace the PCM only after all other possibilities have been eliminated.
A failing fuel pump can produce low fuel pressure symptoms, but it does not create an open circuit in the regulator control line, so it is not a direct cause of P0001.
Clearing the code may turn off the Check Engine Light, but the underlying fault will cause the code to return as soon as the PCM rechecks the circuit.
Driving with an open regulator circuit can lead to poor throttle response, stalling, and reduced power, so it is advisable to diagnose and repair the issue promptly.