P0628

Fuel Pump A Control Circuit Low

Computer output circuit Generic OBD-II High

What it means

P0628 means the PCM detected an abnormally low voltage (usually a short-to-ground or open) on the fuel pump "A" control circuit. Because this circuit switches the fuel pump, the fault can interrupt fuel delivery — leading to hard starting, stalling, or a no-start. Start by inspecting the pump control wiring and relay for a short before replacing parts.

High

Can I keep driving? Risky — fuel delivery can be interrupted, so the engine may stall or fail to start. Fix before relying on the vehicle.

Real-world scan data

Seen in

327

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0628 scans

P0562in 24.5% of scans

P0118in 24.2% of scans

P0122in 17.7% 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

Hard starting or no-start
Stalling or cutting out while driving
Rough running or reduced power under load
Check-engine light on

Common causes

Most likely first

Short-to-ground in the fuel pump control wiringLikely
Faulty fuel pump relay or driverCommon
Corroded or loose connector in the pump control circuitCommon
Failed fuel pumpLess often
PCM control-circuit fault (less common)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame, then inspect the fuel pump control wiring and connectors for a short-to-ground or damage.
Test the fuel pump relay and its control signal from the PCM.
Measure fuel pressure to confirm whether the pump is actually being commanded and running.
Repair the wiring or replace the relay/pump as indicated. Clear and re-test starting and driving.

FAQ

Quick answers

Is it safe to drive with P0628?+

Not reliably. This code involves the fuel pump control circuit, so the engine can stall or refuse to start. Get it repaired before depending on the car.

Can I just clear P0628?+

It will return as soon as the PCM detects the low circuit again. Repair the wiring, relay, or pump first.

Read & clear P0628 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