OBD-II Code · Fuel & Air

P0628

Fuel Pump A Control Circuit Low

Severity

high

Left alone, this one tends to take other parts with it.

Can you drive it

Not for long

Driving on this one risks further damage. Get it to a shop rather than carrying on with it.

Indicative cost (USD)

$100–$500

Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.

Fuel pump control voltage low.

How a shop works this

Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.

Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.

If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.

Common symptoms

Hard start
No start

Likely causes

Wiring shortMost common
Failed driver

Read the full diagnostic procedureP0628 means the Fuel Pump Driver Module (FPDM) — the PWM-controlled driver between the PCM and the in-tank fuel pump — is reporting its control circu…+

P0628 means the Fuel Pump Driver Module (FPDM) — the PWM-controlled driver between the PCM and the in-tank fuel pump — is reporting its control circuit pulled low (shorted to ground, open low-side driver, or commanded duty cycle not matching feedback). On a returnless PWM fuel system the PCM commands the FPDM via a duty-cycle signal (0-100% PWM) and the FPDM regulates pump current accordingly — healthy current draw is roughly 5-15A depending on rail pressure demand, and the feedback line back to the PCM should pulse-width-match the command within a few percent.

Shop-floor ladder, cheapest first

pull the FPDM connector (usually frame-rail or rear-bumper mounted on Ford trucks) and inspect for corrosion and chafing — that alone is the fix on 60%+ of Ford F-150 FPDM tickets.
Scan-tool live data should show commanded fuel pump duty cycle and FPDM feedback side-by-side; if commanded duty rises to 80-100% on cold start but feedback flatlines or reads 0%, the FPDM output stage is dead.
Backprobe the control wire from PCM to FPDM with a scope — you should see a clean PWM square wave varying with pressure demand; a flat low signal points to a shorted-to-ground wire or a failed PCM driver.
Next is fuel pressure at the rail with a mechanical gauge (port-injection target 35-65 psi; direct-injection low-pressure side 50-90 psi).
Expensive-misdiagnosis caveat: don't drop the tank for a fuel pump on P0628 until the FPDM is confirmed dead — on Ford trucks the FPDM is a $100-200 frame-rail part and replaces the pump in roughly half of P0628 cases without ever touching the tank.

Vehicle-specific patterns2011-2016 Ford F-150 EcoBoost 3.5L (and the 5.0 Coyote / 5.4 Triton variants on the same platform) is the textbook P0628 vehicle — the FPDM bolts to…+

2011-2016Ford F-150 EcoBoost 3.5L (and the 5.0 Coyote / 5.4 Triton variants on the same platform) is the textbook P0628 vehicle — the FPDM bolts to the frame rail behind the rear wheel and corrodes from road salt, with chafing where the harness crosses the frame; a relocation kit plus a new FPDM is the standard fix.
2007-2014Lincoln Navigator and 2009-2014 Ford Expedition share the same FPDM platform and the same frame-rail corrosion failure mode.
2014-2019RAM 1500 EcoDiesel 3.0L commonly throws P0628 from a failed fuel pump control module under the rear seat — the high-pressure pump side of the system uses a different controller but the low-pressure lift pump driver fails the same way.
2008-2013Ford Mustang GT 4.6L/5.0L throws P0628 from the same FPDM family with slightly different mounting but identical chafing failure mode.

Estimated repair$200 (FPDM + harness repair DIY) to $1,200 (FPDM + in-tank pump + labor).

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P0628 — frequently asked

What does a P0628 code mean?

Fuel pump control voltage low.

What causes a P0628 code?

Common causes: Wiring short; Failed driver.

What are the symptoms of a P0628 code?

Typical symptoms: Hard start; No start.

Is it safe to drive with a P0628 code?

Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $100-$500.

How do I diagnose a P0628 code?

Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.

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