Fuel Volume Regulator Control Circuit Low
The P0003 code indicates that the Engine Control Module (ECM) has detected a low voltage or current condition in the fuel volume regulator control circuit. This regulator is part of the fuel system that adjusts fuel pressure and volume delivered to the injectors. A low circuit condition typically means there is an open, short to ground, or excessive resistance in the wiring or connector, or a faulty fuel volume regulator solenoid. This can lead to improper fuel pressure, causing drivability issues.
01. Most Common Causes
- Open or shorted wiring in the fuel volume regulator control circuit
- Faulty fuel volume regulator solenoid
- Corroded or damaged connector at the regulator
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may run rough or hesitate
- Poor fuel economy
- Hard starting or stalling
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0003 and check for other codes.
Step 2: Visually inspect the wiring and connector at the fuel volume regulator for damage, corrosion, or loose connections.
Step 3: Measure resistance of the regulator solenoid; compare to manufacturer specs (typically 4-12 ohms).
Step 4: Check for voltage at the regulator connector with key on; should see battery voltage. If not, trace circuit for open or short.
Step 5: If wiring and solenoid are good, test ECM output; if no signal, ECM may be faulty.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the vehicle may experience poor performance, stalling, or reduced fuel economy. Immediate diagnosis is advised.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether it's a wiring fix or solenoid replacement.