P0004Fuel & Air Metering

Fuel Volume Regulator Control Circuit High

P0004 means the ECM detected a high voltage condition in the fuel volume regulator control circuit. Common causes are an open or a short to voltage in the wiring, a failed regulator, or an ECM fault.

🚗 Often driveable but fuel delivery may be affected. Diagnose promptly on diesel and GDI engines.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Open or short to voltage in wiring$50-$300

40%

A break or short to power raises the circuit voltage.

#2Failed fuel volume regulator$150-$600

35%

The regulator solenoid has failed open.

#3ECM driver fault$200-$1000

15%

A failed output driver in the ECM.

🩺 Common Symptoms

Check engine light
Hard starting
Reduced power
Rough running
Poor fuel economy

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$600

Shop Cost

$150-$1000

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P0004

1Inspect regulator wiring for opens or shorts to voltage

2Measure regulator solenoid resistance

3Check control circuit voltage with a meter

4Replace the regulator if failed open

❓ Frequently Asked Questions

Can I drive with P0004?

Short trips are usually possible, but fuel delivery can suffer. Diagnose promptly, especially on diesel and GDI engines.

What is the most common cause of P0004?

An open or short to voltage in the wiring, or a failed regulator solenoid, are the most common causes.

How much does P0004 cost to fix?

Wiring repairs are cheap, while regulator replacement often runs $150-$600.

🔗 Related Codes

P0001P0002P0003P0087