P0004

Fuel Volume Regulator A Control Circuit High

Q: Is it safe to drive with P0004?

Short trips are usually possible, but inconsistent fuel pressure can cause stalling or a no-start, so treat it as a soon-to-fix item.

Q: Can I just clear P0004?

It will return until the circuit fault is fixed — this is an electrical circuit code, not a one-off glitch.

Fuel & air metering Generic OBD-II High

What it means

P0004 means the ECM has detected an abnormally high voltage in the control circuit for the fuel volume regulator — the valve that meters how much fuel reaches the high-pressure fuel system. Because fuel pressure may no longer be controlled accurately, the engine can start hard, hesitate or stall, so it is worth fixing promptly even if the car still runs.

High

Can I keep driving? Often driveable, but fuel-pressure control is compromised — expect hard starting, hesitation or stalling, so repair it promptly.

Real-world scan data

Seen in

232

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0004 scans

P0113in 30.6% of scans

P0001in 30.2% of scans

P0201in 21.6% 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 intermittent stalling
Hesitation, surging or reduced power under load
Poor fuel economy

Common causes

Most likely first

Open, shorted or chafed wiring in the fuel volume regulator control circuitLikely
Corroded or loose regulator connector pinsCommon
Failed fuel volume regulator (control solenoid)Common
Failed ECM driver (least likely)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data, then inspect the regulator connector and harness for corrosion, backed-out pins or chafing.
Check the control circuit for a short to voltage or an open against the wiring diagram; repair as needed.
Measure the regulator solenoid resistance and its supply/ground; replace the regulator if out of spec.
Only after wiring and the regulator check out, suspect the ECM driver. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0004?+

Short trips are usually possible, but inconsistent fuel pressure can cause stalling or a no-start, so treat it as a soon-to-fix item.

Can I just clear P0004?+

It will return until the circuit fault is fixed — this is an electrical circuit code, not a one-off glitch.

Read & clear P0004 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