P0003Fuel & Air Metering

Fuel Volume Regulator Control Circuit Low

P0003 means the ECM detected a low voltage condition in the fuel volume regulator control circuit. Common causes are a short to ground in the wiring, a failed regulator, or an ECM driver fault.

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

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Short to ground in wiring$50-$300

40%

A grounded control wire pulls the circuit voltage low.

#2Failed fuel volume regulator$150-$600

35%

An internally shorted regulator solenoid.

#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 P0003

1Inspect the regulator wiring for shorts to ground

2Measure regulator solenoid resistance

3Check the control circuit voltage with a meter

4Replace the regulator if internally shorted

❓ Frequently Asked Questions

Can I drive with P0003?

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 P0003?

A short to ground in the control wiring or a shorted regulator solenoid are the most common causes.

How much does P0003 cost to fix?

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

🔗 Related Codes

P0001P0002P0004P0087