P0629

Fuel Pump A Control Circuit High

Q: Is it safe to drive with P0629?

Not reliably. A fuel-pump control fault can leave you stranded with a no-start or stall. Get it diagnosed before depending on the car.

Q: Can I just clear P0629?

It will return while the control circuit reads high. Repair the relay, wiring, or control module first.

Fuel delivery Generic OBD-II High

What it means

P0629 means the ECM has detected a high-voltage condition in the control circuit for fuel pump 'A'. This circuit commands how the pump runs, so a fault here can disturb fuel delivery — causing hard starts, stalling, or a no-start. Because it can leave the vehicle unable to run, it should be diagnosed promptly.

High

Can I keep driving? Risky — a fuel-pump control fault can cause hard starts, stalling, or a no-start. Address it before relying on the vehicle.

Real-world scan data

Seen in

209

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0629 scans

P0627in 25.8% of scans

P1200in 24.4% 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 no-start
Stalling or loss of power
Fuel pump running abnormally, or inadequate fuel pressure

Common causes

Most likely first

Faulty fuel pump relay or driverLikely
Short to voltage or open in the fuel-pump control wiringCommon
Failed fuel pump (driver) control moduleCommon
Corroded or loose connector in the fuel-pump circuitLess often
ECM fault (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check fuel pressure to gauge delivery.
Inspect the fuel pump relay and control wiring for a short to voltage or open.
Measure the control-circuit voltage against specification.
Test the fuel pump control module (where fitted) and the pump itself.
If wiring and components are good, have the ECM tested. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0629?+

Not reliably. A fuel-pump control fault can leave you stranded with a no-start or stall. Get it diagnosed before depending on the car.

Can I just clear P0629?+

It will return while the control circuit reads high. Repair the relay, wiring, or control module first.

Read & clear P0629 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