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.

Real-world scan data

Seen in

1,145

scans in the past year

Found in

0.2%

of scans

0.3%

of scans that found faults

Appears alongside · share of P0002 scans

P2263in 41.8% of scans

P0201in 38.7% of scans

P0202in 38.7% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0002 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX