P0628
Fuel Pump A Control Circuit Low
P0628 is an OBD-II diagnostic trouble code meaning: Fuel Pump A Control Circuit Low. Common causes: oxidation or poor contact in the pump relay connector, partial wire break in the control circuit. Estimated repair cost: $3–111.
Symptoms
- The Check Engine light comes on
- Unstable engine starting
- Intermittent failures during acceleration
- The engine stalls periodically
- Unstable fuel pressure during diagnosis
Causes
- Oxidation or poor contact in the pump relay connector
- Partial wire break in the control circuit
- Discharged battery - voltage drop when starting
- High resistance in the ECU ground circuit
- Weak output transistor for pump control in the ECU
How to Fix
- Check and charge the battery
- Clean fuel pump relay contacts
- Check the resistance of the pump control circuit wire
- Measure the voltage drop at each section of the circuit
- Check ECU grounding
- If external circuits are in good working order - ECU diagnostics
Related codes
Error P0628 by Vehicle Brand
FAQ
What does the P0628 code mean?
P0628 is an OBD-II diagnostic trouble code that indicates: Fuel Pump A Control Circuit Low
What causes a P0628 error code?
The most common causes of P0628 include: Oxidation or poor contact in the pump relay connector; Partial wire break in the control circuit; Discharged battery - voltage drop when starting; High resistance in the ECU ground circuit.
How do I fix a P0628 diagnostic trouble code?
To fix P0628: Check and charge the battery. Clean fuel pump relay contacts. Check the resistance of the pump control circuit wire. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0628?
Yes, but get it checked soon
How much does it cost to fix P0628?
The estimated repair cost for P0628 is $3–111. Actual cost depends on your vehicle, location, and labor rates.
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