Skip the auto shop - Our mechanics make house calls

P0004 OBD-II Trouble Code: Fuel Volume Regulator Control Circuit High

check engine light logo

P0004 trouble code definition

The P0004 code is associated with the electrical circuit which connects to your fuel system and is most commonly found on diesel engines.

It also may be related to other codes, such as: P0006 or P0007.

What the P0004 code means

P0004 is a generic OBD-II code indicating an issue with the engine control module (ECM) not reading signals from your fuel shut-off on your fuel injection rail mounted to your engine.

The ECM uses the fuel shut-off valve to stop fuel from entering the engine when you turn it off. By doing so, it prevents your engine from continuing to run after you turn the key off (a term we call ‘dieseling’). The code will cause this problem and set a Check Engine Light.

What causes the P0004 code?

The fuel shutoff valve "A" control circuit/open code may have several causes:

  • Possible corrosion in the sensor connector
  • A broken wire to the ECM
  • A defective fuel shutoff valve
  • The ECM is damaged

What are the symptoms of the P0004 code?

The P0004 code will produce a Check Engine Light on the instrument panel/dash and will likely cause:

  • Your engine to continue running after the key is turned off
  • Your engine to not start because it cannot build fuel pressure
  • Possible stalling while driving

How does a mechanic diagnose the P0004 code?

P0004 is properly diagnosed with an advanced scan tool capable of factory sensor readings (not just one from an auto parts store) and a voltage meter. A qualified technician can read the data from the advanced scan tool to determine when the problem occurred, or if it is still occurring. They may clear the code and test drive the vehicle while monitoring the scan tool data to see if the fault returns or is constant.

Wiring may have to be inspected for damage (which may require) cutting open the protective covering, inspecting the wiring harness, and replacing the covering.

Based upon the conditions of the test, possibly clearing the code and performing a road test while monitoring the data, further diagnosis may be required. Diagnosis may require multiple tools such as:

  • An advanced scan tool to read the ECM data values
  • A digital voltage meter with attachments

Common mistakes when diagnosing the P0004 code

Just replacing the fuel pressure shutoff valve doesn’t guarantee a successful repair and may be very expensive and labor intensive. It may be caused by several components in the electrical system and wiring as listed above or even more. A visual inspection and testing with special equipment listed above will verify your issue before unnecessarily replacing the fuel shutoff valve.

Electrical signals require evaluation by an advanced scan tool and a voltage meter to ensure that the fuel shutoff valve requires replacement or if another problem exists. Additional inspection and testing may be required.

How serious is the P0004 code?

The P0004 fault code may cause the following with your vehicle:

  • Lower your fuel economy
  • Prevent your vehicle from starting
  • Prevent your vehicle from turning off
  • Cause your vehicle to stall at anytime while driving
  • Prevent your vehicle from passing emissions

A qualified technician can diagnose the problem with proper tools and time to verify these potential issues and effects to your other systems.

What repairs can fix the P0004 code?

The most common procedure to repair the P0004 code are as follows:

  • Connect a professional scan tool to verify the code exists.

  • Perform research from professional sources for testing and values based upon the code.

  • Check for any other fault codes which may be related to the issue.

  • Perhaps clear the fault codes to see which fault codes return.

  • Analyze scan tool data from the ECM.

  • Road test the vehicle while analyzing the scan tool data from the ECM with other tools attached.

  • Verify if the P0004 code returns or the symptoms exist.

  • Inspect all of the items listed above (wiring, voltages, etc.).

  • Further diagnose the problem with the special tools listed above if the problem appears to repeat. The signals and wiring from the sensor require analyzation to determine where the problem exists. If the signals are fine, then further testing of the the wiring, computer, or fuel system is required.

  • Replace the fuel shutoff valve, wiring, or what is faulty.

Additional comments for consideration regarding the P0004 code

Any electrical related code may occur constantly or intermittently. Some fault codes will require additional time to diagnose. With this code, the solution may be simple to replace or require extensive time to diagnose and repair. Depending on your vehicle, it may take several hours to determine the root cause and repair the faulty component.

The P0004 code involves many systems and requires extensive diagnosis. After using a scan tool and monitoring the voltage readings, a qualified technician can determine if the fuel pressure regulator, wiring, or other component is at fault. With the scan tool connected, I evaluate the data while checking the voltage meter to ensure all the values are adequate, match specifications, and perform a visual inspection. If there is not a specified voltage or signal, then a further diagnosis is required.

The sensor may be the cause, wiring issues might be burning/rubbing on another engine component, rodents may have chewed through wiring anywhere in the vehicle, connectors may have shorts or damage, or you may have a bad ECM.

Vehicles with higher mileage may just need a fuel shutoff valve replacement. However, replacing parts based upon a code is not recommended and has caused problems or not resolved the issue.

Need help with a P0004 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...


Related questions

Q: Low power and rough running. Check engine light flashing but no codes at download.

This may be caused by a few different things such as dirty fuel injectors, low fuel pressure or a dirty or failing mass air flow sensor. As you may know, dirty fuel injectors may cause intermittent fuel supply to...

Q: rough idle, heavy missing, fault codes P0301 and P0456. lack of power, where do i start to diagnose this?

Hi there. From the description you have provided, for the P0301 rough idle and heavy misfire and P0456 evaporative small leak detected, the problems are unrelated. The P0301 is a #1 cylinder misfire code. It could be, a spark plug...

Q: I have a check engine light and a trac off light on and the cruis control does not work

The dealer will not try and do any repairs unless they can verify and duplicate the problem. If they cleared the codes and then cannot verify the problem and light coming back on then they are not going to do...