P0002 Fuel Volume Regulator Control Circuit Range/Performance

P0002 points to fuel volume regulator control range/performance. The regulator circuit may work electrically but fuel-volume response is outside expected limits.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not diagnose range/performance from the code label alone; compare commanded and actual fuel pressure behavior.

Symptoms of P0002

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0002

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Compare commanded fuel volume, actual fuel pressure, regulator duty cycle, rail pressure sensor data, and engine load during the fault.
Inspect fuel supply restriction, regulator wiring, connector condition, high-pressure pump behavior, and low-pressure feed stability.
Check whether the performance fault appears during startup, acceleration, high load, deceleration, or hot restart.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.