P0004
Fix within a few daysFuel Volume Regulator Control Circuit High
Code P0004 means the fuel volume regulator control circuit has high voltage. Common causes: Faulty regulator (70%), wiring issues (25%). Drivability: Limit driving, fix within days. Repair cost: $150-$400 DIY, $300-$800 professional.
Can I Drive With P0004?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy acceleration.
Stop driving immediately if: Engine stalls repeatedly, significant power loss, strong fuel smell, flashing CEL.
Symptoms of P0004
- 1Check Engine Light on
- 2Engine hard to start or won't start
- 3Engine stalls unexpectedly
- 4Reduced engine power or poor acceleration
- 5Engine runs rough or idles poorly
- 6Poor fuel economy
Common Causes of P0004
Parts most likely causing this code, ranked by probability
The fuel volume regulator itself has an internal electrical fault or is stuck open, causing the control circuit voltage to read high.
70% of P0004 cases are fixed by replacing this part
A short to voltage, open circuit, or poor connection in the wiring harness leading to the fuel volume regulator causes an incorrect high voltage reading.
25% of P0004 cases are fixed by repairing wiring or connectors
An internal fault within the PCM/ECM causes it to incorrectly interpret or send a high voltage signal to the fuel volume regulator circuit.
5% of P0004 cases are fixed by replacing the PCM/ECM
Check These First (Before Buying Parts)
- Visually inspect the fuel volume regulator's electrical connector for corrosion, bent pins, or loose connections.
- Check the wiring harness for any obvious damage, chafing, or signs of a short to power.
- Ensure the battery voltage is good; low voltage can sometimes cause electrical circuit codes.
How to Diagnose P0004
- 1Visually inspect the fuel volume regulator and its electrical connector for damage, corrosion, or loose connections.
- 2Check the wiring harness leading to the fuel volume regulator for any signs of chafing, cuts, or shorts to power.
- 3Using a multimeter, test the voltage at the fuel volume regulator connector to ensure it's within specifications (refer to service manual).
- 4If wiring and connections are good, test the resistance of the fuel volume regulator itself.
- 5If the regulator tests bad, replace it. If wiring and regulator test good, further diagnosis of the PCM may be necessary.
P0004 on Popular Vehicles
Ford F-150
2011-2024Ford F-150s with EcoBoost engines are prone to P0004 due to issues with the fuel pressure regulator (often integrated into the high-pressure fuel pump) or its wiring.
75% fixed by replacing the fuel metering valve or high-pressure fuel pump assembly
Chevrolet Silverado
2014-2024Silverado trucks with direct injection engines can trigger P0004 from a faulty fuel metering valve on the high-pressure fuel pump or a short in its wiring harness.
70% fixed by replacing the fuel metering valve
Honda Accord
2008-2024Honda Accords, particularly those with direct injection, can experience P0004 due to a failing fuel pressure sensor or the fuel volume control valve.
65% fixed by replacing the fuel volume control valve
Frequently Asked Questions
What does P0004 mean?
P0004 indicates the Powertrain Control Module (PCM) has detected a high voltage condition in the control circuit for the fuel volume regulator.
Can I drive with P0004?
Limit driving, fix within a few days. This code indicates a problem with fuel delivery, which can cause stalling, reduced power, or a no-start condition.
Will P0004 clear itself?
No. A P0004 code indicates a hard fault in the fuel system's electrical circuit. It requires diagnosis and repair to clear.
How do I fix P0004 myself?
Start by inspecting the fuel volume regulator's wiring and connector. If they look good, test the regulator itself with a multimeter. Replacing a faulty fuel volume regulator is a common DIY fix.
How much does it cost to fix P0004?
DIY costs range from $150-$400 for a new fuel volume regulator. Professional repair costs are $300-$800, including parts and labor.
P0004 keeps coming back - why?
The code keeps returning if the root cause wasn't correctly identified. This often means a wiring issue was missed, or the replacement fuel volume regulator is also faulty, or the PCM itself has an issue.
Will P0004 fail emissions/smog test?
Yes. A P0004 code will illuminate the Check Engine Light, which is an automatic failure for emissions or smog tests.
What's the difference between P0004 and P0003?
P0004 indicates a "high" voltage condition in the fuel volume regulator control circuit, meaning the voltage is too high. P0003 indicates a "low" voltage condition, meaning the voltage is too low.
P0004 on Ford F-150?
Ford F-150s, especially those with direct injection, are known to experience P0004 due to issues with the fuel pressure regulator or fuel metering valve on the high-pressure fuel pump.
Questions to Ask Your Mechanic
Did you check the wiring harness for shorts or open circuits to the fuel volume regulator before condemning the part?
Good answer: Yes, I performed a full continuity and voltage drop test on the circuit from the PCM to the regulator. The wiring is good; the regulator itself is faulty.
Repair Cost Estimate
DIY Repair
Parts only
$150-$400
Shop Repair
Parts + labor
$300-$800
Save $150-$400 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires a multimeter and basic electrical diagnostic skills, along with vehicle-specific wiring diagrams.
Cost of Waiting
Ignoring P0004 can lead to severe drivability issues like stalling or a no-start condition. It can also cause the engine to run lean or rich, potentially damaging fuel injectors, spark plugs, or even the catalytic converter ($800-$2,500 repair) over time.
While You're In There...
If the fuel volume regulator is being accessed or replaced, it's a good time to replace the fuel filter, especially if it's located in the fuel line or tank and due for service.
Often located near the fuel volume regulator or on the fuel rail, it's a critical component in fuel system regulation and can be replaced with minimal additional labor.
Tools You'll Need
- OBD-II scan tool
- Multimeter
- Basic hand tools (sockets, wrenches)
- Wiring diagram (vehicle specific)
P0004 is a common fuel system electrical code. Most repairs involve replacing a faulty sensor or repairing a wire, and your vehicle's fuel delivery will be restored.
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Your Next Steps
Step 1: Check the electrical connector and wiring for the fuel volume regulator for any visible damage or loose connections.
Step 2: If the wiring looks good, use a multimeter to test the voltage at the regulator's connector and the resistance of the regulator itself. Compare readings to your vehicle's service manual.
Step 3: Parts you'll likely need: A new fuel volume regulator or fuel metering valve.