P0001 moderate

Fuel Volume Regulator Control Circuit Open

The P0001 code means the vehicle's onboard diagnostic system has detected: Fuel Volume Regulator Control Circuit Open. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $150 - $600 (parts and labor)

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Common Symptoms

Check Engine Light on
Hard starting
Engine stalling
Reduced engine power

Probable Causes (Ranked by Likelihood)

Faulty fuel volume regulator solenoid Very High
Open or shorted wiring to fuel volume regulator High
Corroded connector at fuel volume regulator Moderate
Failed ECM/PCM Low

Step-by-Step Diagnostic Procedure

Read freeze frame data and note engine operating conditions when the code was set
Inspect wiring and connector to the fuel volume regulator on the high-pressure fuel pump for damage or corrosion
Measure resistance across the fuel volume regulator solenoid terminals and compare to manufacturer specification (typically 1-6 ohms)
Use a scan tool to command the fuel volume regulator and verify it responds properly

Frequently Asked Questions

What does the fuel volume regulator do?

The fuel volume regulator controls how much fuel the high-pressure pump delivers to the fuel rail. It adjusts fuel volume based on engine demand to maintain proper rail pressure while improving efficiency.

Is P0001 only found on diesel engines?

While P0001 is most common on direct-injection diesel engines that use high-pressure common rail systems, it can also appear on gasoline direct injection (GDI) engines that have a similar fuel volume control solenoid on the high-pressure pump.

Can I drive with P0001?

You can drive short distances but the engine may stall or have reduced power. The vehicle may enter limp mode. Have it diagnosed promptly to avoid being stranded or damaging the high-pressure fuel system.