P0004 Fuel Volume Regulator Control Circuit High

Description and meaning of DTC p0004

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 P0004 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 P0004 code, it refers to an electrical reading that is above expected parameters. This code is related to P0001, P0002, and P0003.

p0004 diagnostic trouble code symptoms

Symptoms of a P0004 DTC may include:Malfunction indicator lamp (MIL) illuminationVehicle won't start"Limp mode" enabled and/or lack of power

DTC p0004 - possible causes

Potential causes of this engine code may include:Failed fuel volume regulator (FVR) solenoidFVR wiring/harness electrical problem (wiring short, corrosion, etc. )

How to fix OBD-II diagnostic trouble code p0004

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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