P0628 Fuel pump A control circuit low
What P0628 means
The engine computer or a fuel pump control module switches the fuel pump on and controls its speed. P0628 means the control circuit voltage is lower than expected, often caused by a short to ground. The pump may not run properly, which can cause poor running or a no-start.
P0628 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 120–800 €
- Workshop time
- 0.5–3 h
- Repair difficulty
- Medium
- DIY possible
- No
- Check engine light
- Yes
- Affects emissions test
- Yes
- Limp mode possible
- Yes
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Check engine light on
- Hard starting or no-start
- Stalling or power loss under load
- Long cranking
Common causes
- Control wire shorted to ground
- Damaged or chafed wiring near the tank or under the car
- Corroded fuel pump connector
- Failed fuel pump relay or fuel pump control module
- Failing fuel pump drawing excessive current
Can I keep driving with P0628?
If the car runs normally you can drive, but have it repaired within one or two weeks. The fault can cause stalling or leave you unable to start.
What to check first
- Check the fuel pump fuse and relay
- Inspect the wiring from the control module to the pump for chafing and corrosion
- Check the control circuit for a short to ground with the module unplugged
- Test pump current draw and replace the pump or control module as indicated
Related codes
- P0627 Fuel pump control circuit/open
- P0620 Generator (alternator) control circuit
- P0615 Starter relay circuit
- P0610 Control module vehicle options error
- P0645 A/C clutch relay control circuit
- P0607 Control module performance
- P0606 Control module processor fault
- P0605 Internal control module read only memory (ROM) error
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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