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OBD-II code P0001 is a generic diagnostic trouble code (DTC) related to a potential malfunction with your vehicle’s fuel regulator control valve or its circuit system.

What does the P0001 Code Mean?

Diagnostic trouble code P0001 stands for “Fuel Volume Regulator Control Circuit/Open.”

Although P0001 is a generic code, it can pop up on various makes and models. This code indicates that your vehicle’s primary computer or PCM has detected a potential open in the fuel volume control valve (FVCV) circuit.

Note: The definition of OBD code P0001 may vary depending on the vehicle manufacturer. It is best to consult your trusted repair manual or repair database for the exact code definition.

More on FVCV

To understand the code more, let’s discuss more about the FVCV circuit. On common rail (gasoline direct injection or common rail diesel) fuel injection systems, the pressure needed by the fuel injector comes from an engine-driven injection pump. The role of the FVCV is to regulate the fuel volume that comes from the injection pump. Controlled by a solenoid, the PCM can turn the valves on and off, allowing fuel injectors to get enough fuel.

A fuel pressure sensor monitors the performance of your vehicle’s FVCV. Once the PCM detects a fault, particularly an open in the FCVC or its circuit, it will trigger code P0001.

The camshaft typically drives the high pressure fuel pump and the ECM/PCM knows when the pump is stroking up, producing pressure. The fuel volume regulator is a two-wire solenoid with very low resistance (don’t try to jumper it or you’ll burn it out). At any rate, the ECM/PCM controls both the power and ground side of the solenoid, and if either circuit or the solenoid is open, it’ll throw code P0001.

common rail fuel injection system
On common rail fuel injection systems, the pressure needed by the fuel injector comes from an engine-driven injection pump.

What are the Possible Causes of the P0001 Code?

There can be several underlying triggers that may cause an open circuit in the FVCV circuit. Here are some of them:

There can be several underlying triggers that may cause an open circuit in the FVCV circuit. Here are some of them: 

  • Malfunctioning fuel volume control valve 
  • Circuit issues, such as damaged wiring or poor connections 
  • Problem with the PCM
  • Faulty fuel pressure sensor 

What are the Common Symptoms of the P0001 Code?

engine performance problems
If you encounter the P0001 code, your car may exhibit engine performance problems.

Your vehicle’s check engine light will most likely illuminate because of this code. Aside from that, here are other symptoms to watch for:

  • Engine performance problem
  • Vehicle may not start
  • Vehicle might go on “limp mode”
  • Lack of engine power

How to Diagnose the P0001 Code

Diagnosing any OBD-II code like P0001 can be challenging. If you’re not equipped with the DIY automotive repair skills, it is best to take your car to an auto repair shop for proper diagnosis.

However, if you are an automotive DIYer and you’re willing to take on the challenge, here is a video you can watch to help you understand the code better:

How to Fix the P0001 Code

There is no universal fix for any OBD-II code, including P0001. Again, if you’re not well-versed with automotive repair, the safest option is to bring your car to an auto repair shop. Remember that although this code is generic, diagnostic and repair procedures may vary depending on a car’s make and model. For example, repair steps for P0001 in a Suzuki may differ from the repair steps for P0001 in a BMW.

If you’re determined to fix this code yourself, and you have the DIY repair skills to do so, consult online repair guides and manuals to help you identify the repair procedure compatible with your vehicle. To help you with the repair, you may also opt to get an ALLDATA single-vehicle subscription.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

File Under : OBD-II Trouble Codes
tail light


  1. Gurmit says

    I have a code P0001 on my Toyota Tacoma 07 4 cylinder. I don’t know what to do? How can I fix this code?

    • says


      The repair information I have indicates that your vehicle does not support that code. Do you have another code reader you can try? It’s possible that the code reader you’re using is picking up faulty information.

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