P0001 Fuel Volume Regulator Control Circuit/Open Trouble Code

P0001 Fuel Volume Regulator Control Circuit/Open

OBD-II Trouble Code Technical Description

Fuel Volume Regulator Control Circuit/Open

What does that mean?

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, including but not limited to Ford, Dodge, Vauxhall, VW, Mazda, etc. Although generic, the specific repair steps may vary depending on make/model.

A P0001 is not a very common trouble code and is more often seen on common rail diesel (CRD) and/or diesel engine, and gasoline direct injection (GDI) equipped vehicles.

 

This code relates to the the electrical system as part of the fuel volume regulator system. Automotive fuel systems consist of many components, the fuel tank, fuel pump, filter, lines, injectors, etc. One component in high pressure fuel systems is a high pressure fuel pump. It's job is to increase the fuel pressure for the very high pressure needed at the fuel rail for the injectors. These high pressure fuel pumps have a low pressure side and high pressure side, and a fuel volume regulator which controls the pressure. For this P0001 code, it refers to an electrical reading that is "open".

This code is related to P0002, P0003, and P0004.

Symptoms

Symptoms of a P0001 DTC may include:

Malfunction indicator lamp (MIL) illumination Vehicle won't start "Limp mode" enabled and/or lack of power

Potential Causes

Potential causes of this engine code may include:

Failed fuel volume regulator (FVR) solenoid FVR wiring/harness electrical problem (wiring short, corrosion, etc.)

Possible Solutions

First, check for known Technical Service Bulletins (TSBs) for your year/make/model. If there is a known TSB that addresses this issue, it can save you time & money during diagnosis.

Next, you'll want to visually inspect the wiring and connectors pertaining to the fuel volume regulator circuit and system. Look for obvious breaks in the wires, corrosion, etc. Repair as necessary.

The fuel volume regulator (FVR) is a two-wire device with the wires both going back to the PCM. You should not apply direct battery voltage to the wires or you could damage the system.

Refer to a factory service manual for more specific troubleshooting steps for your year/make/model/engine.

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