Fuel Volume Regulator Control Circuit Range/Performance
Code P0002 means the PCM has detected that the fuel volume regulator (FVR) control circuit signal is outside its expected operating range. Unlike P0001 (open circuit), P0002 indicates the circuit is active but the signal is erratic or outside normal parameters — meaning the FVR cannot maintain consistent fuel rail pressure. This code is most common on diesel engines and gasoline direct injection (GDI) vehicles.
What You Might Notice
- Check engine light on
- Hard starting or no-start condition
- Rough idle or engine surging
- Hesitation or stumbling during acceleration
- Limp mode or reduced power
- Poor fuel economy
Most Common Causes
- 1
Failing fuel volume regulator solenoid
A degraded or intermittently failing FVR solenoid produces erratic signals outside the expected voltage range. The solenoid may pass a static resistance test but fail under operating conditions.
- 2
Intermittent wiring fault or connector corrosion
Corroded connector pins or a wire with an intermittent short or high-resistance connection cause the circuit signal to fluctuate beyond the PCM's accepted threshold, setting P0002.
- 3
Low or contaminated fuel supply
A clogged fuel filter, weak fuel pump, or contaminated fuel can cause the high-pressure pump to struggle, creating abnormal FVR feedback signals. Check fuel quality and filter condition first.
- 4
High-pressure fuel pump wear
Internal wear in the high-pressure fuel pump causes inconsistent pressure output, which the PCM interprets as a range or performance fault in the FVR circuit.
How to Diagnose It
- 1
Check Failing fuel volume regulator solenoid — A degraded or intermittently failing FVR solenoid produces erratic signals outside the expected voltage range. The solenoid may pass a static resistance test but fail under operating conditions.
- 2
Check Intermittent wiring fault or connector corrosion — Corroded connector pins or a wire with an intermittent short or high-resistance connection cause the circuit signal to fluctuate beyond the PCM's accepted threshold, setting P0002.
- 3
Check Low or contaminated fuel supply — A clogged fuel filter, weak fuel pump, or contaminated fuel can cause the high-pressure pump to struggle, creating abnormal FVR feedback signals. Check fuel quality and filter condition first.
- 4
Check High-pressure fuel pump wear — Internal wear in the high-pressure fuel pump causes inconsistent pressure output, which the PCM interprets as a range or performance fault in the FVR circuit.
How to Fix It
- 1
Inspect and clean the FVR connector
Remove the fuel volume regulator connector and inspect for corrosion, bent pins, or moisture. Clean with electrical contact cleaner and apply dielectric grease before reconnecting. Wiggle-test while monitoring live fuel pressure data.
- 2
Replace the fuel filter
A clogged filter is an inexpensive first step that addresses fuel supply restrictions. Replace the fuel filter and retest before moving on to more expensive components.
- 3
Test fuel rail pressure with a gauge
Connect a fuel pressure gauge and compare readings at idle, under load, and during deceleration against manufacturer specifications. Pressure that cannot hold steady or drops quickly points to a failing fuel pump or FVR solenoid.
- 4
Replace the fuel volume regulator solenoid
If wiring and fuel supply are confirmed good, replace the FVR solenoid. On many vehicles this is a serviceable component on the high-pressure pump. Use an OEM or OEM-equivalent part for reliable results.
- 5
Clear codes and road test
After completing repairs, clear all stored DTCs and drive the vehicle through normal operating conditions. Rescan to confirm P0002 is resolved.
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