P0002: Fuel Volume Regulator Control Circuit Range/Performance

What does P0002 mean?

The fuel-volume regulator control circuit is operating outside its expected range or response. The fault is less specific than a confirmed open, low, or high circuit condition. This system is common on common-rail diesels and gasoline direct-injection engines; the exact regulator arrangement varies by engine.

Generic OBD-II definition: Fuel Volume Regulator Control Circuit Range/Performance. Confirm applicability in your vehicle service information.

Common causes

• Faulty volume-control solenoid
• Poor regulator electrical connection
• Harness resistance or an intermittent short

Symptoms

• Hard starting or no start
• Reduced power or limp mode
• Check engine light

Diagnostic focus

A performance result calls for checking how the regulator responds, not just checking for continuity. Record whether the problem appears at startup or only as fuel demand increases.

Can I keep driving with P0002?

Severity: High Avoid driving if the engine stalls, leaks fuel, or runs roughly. High-pressure fuel testing belongs with a qualified technician; never loosen a fuel rail or injector pipe to check pressure.

If the check engine light is flashing or the car runs badly, stop driving and have it checked.

Typical fixes

• Inspect the regulator harness and plug
• Compare the commanded regulator operation with fuel-pressure feedback, then test the control circuit using the factory procedure.
• Replace only the valve or wiring proven faulty

Sources & review

• OBD-Codes.com: P0002
• TroubleCodes.net: generic code definitions

Definitions and diagnostic background checked 2026-11-06. Generic guidance, not a substitute for the service procedure for your exact year, engine, and transmission.