P0003 - Fuel Volume Regulator Control Circuit Low

About Trouble Code P0003

This trouble code exists in OBD-II equipped vehicles and is most often seen on common rail diesel engines and gasoline direct injection vehicles, code P0003 is not common. P0003 is due to an electrical reading that is below the normal range. The fuel volume regulator system has a component, the high-pressure fuel pump. It increases fuel pressure for the exceptionally high pressure needed for the injectors. High-pressure pumps have a regulator that controls the pressure and read it, telling whether it is high or low. P0003 indicates that it is low.

Symptoms of Trouble Code P0003

If trouble code P0003 exists, the Malfunction Indicator Lamp (MIL) will trigger. The vehicle may not start or there may be a decrease in power.

Causes of Trouble Code P0003

This code can happen if there is a failed Fuel Volume Regulator (FVR) solenoid or if the FVR has an electrical problem. An electrical problem could be due to a short in the wiring or corrosion. One other possible cause would be a failure in the Powertrain Control Module (PCM).

How to Fix Trouble Code P0003

You may want to check out Technical Service Bulletins for the make, mode, and year of the vehicle. If there is a known issue it can save time in diagnosis. Also, make sure the code actually exists by clearing it and taking the vehicle for a drive to see if it resurfaces. Look over the wiring and connectors for the FVR system. If you see any corrosion or obvious breaks, fix those first. The FVR has two wires and they both lead to the engine’s computer, be careful to ensure you don’t apply direct battery voltage or you could damage the system. If no problems are found in the wiring, move on to checking the FVC solenoid and the circuit.

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