P0002
Fuel Volume Regulator A Control Circuit Performance
Fuel & air metering
Generic OBD-II
High
What it means
P0002 means the ECM commands the fuel volume regulator — the valve that controls how much fuel the high-pressure pump delivers — but the resulting fuel pressure doesn't match what's expected. Because it affects fuel delivery, the engine can be hard to start, run rough, or lose power. It usually points to the regulator, its wiring, or a fuel-supply problem.
High
Can I keep driving? Risky — fuel pressure may not be controlled correctly, so the engine can be hard to start, lose power, or stall under load. Get it checked promptly.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting or long cranking
- Lack of power, hesitation, or rough running under load
- Reduced fuel economy
- Possible stalling when accelerating or under demand
Common causes
Most likely first
- Faulty fuel volume regulator (fuel metering / suction control valve)Likely
- Loose, corroded, or damaged wiring or connector at the regulatorCommon
- Low fuel pressure from a weak pump, restriction, or clogged filterCommon
- Faulty fuel-pressure sensor giving wrong feedback to the ECMLess often
- Failed engine control module (rare)Less often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data; note commanded vs actual fuel-rail pressure.
- Inspect the regulator's connector and wiring for corrosion, chafing, or looseness.
- Measure the regulator's resistance and check it operates when commanded.
- Check fuel supply — pump output, filter, and lines — for restriction or low pressure.
- Replace the fuel volume regulator if it fails testing; treat the ECM as the last resort.
FAQ
Quick answers
Is it safe to drive with P0002?+
Only briefly. Fuel pressure may not be regulated properly, which can cause hard starting, power loss, or stalling under load. Have it diagnosed soon.
Can I just clear P0002?+
You can, but it returns until the regulator circuit or fuel-pressure fault is fixed. Clearing does not repair the underlying problem.
Related codes
Often seen with P0002
Read & clear P0002 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX