OBD-II Error Code P0628: Fuel Pump A Control Circuit Low - How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P0628
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0628 indicates that the powertrain control module (PCM) has detected a low voltage or current condition in the fuel pump A control circuit. This means the fuel pump may not be receiving proper electrical power, which can cause hard starting, stalling, or poor engine performance.
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Tools You'll Need

How to Fix Error Code P0628

  1. Safety First: Disconnect Battery

    Always wear safety glasses and gloves when working under the hood. Fuel system components may be under pressure.

  2. Locate and Inspect Fuel Pump Relay and Fuse

  3. Check Fuel Pump Wiring and Connector

    Be careful not to damage the fuel tank or lines. If you smell fuel, stop and ventilate the area.

  4. Test Fuel Pump Electrical Resistance

  5. Verify Fuel Pump Ground Circuit

  6. Replace Faulty Components

    Fuel system components may be under pressure. Relieve fuel pressure before disconnecting lines.

  7. Clear Error Codes and Test Drive

Parts You May Need

Fuel pump relay
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Fuel pump module assembly
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Wiring harness connector
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Fuel pump relay
Check Price on Amazon
Fuel pump module assembly
Check Price on Amazon
Wiring harness connector
Check Price on Amazon
Fuel pump relay
Check Price on Amazon
Fuel pump module assembly
Check Price on Amazon
Wiring harness connector
Check Price on Amazon
Fuel pump relay
Check Price on Amazon
Fuel pump module assembly
Check Price on Amazon
Wiring harness connector
Check Price on Amazon
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When to Call a Professional

If you are not comfortable testing electrical circuits or accessing the fuel pump (which often requires lowering the fuel tank), or if the steps above do not resolve the issue, consult a certified mechanic. The PCM itself may be faulty and requires professional diagnosis.

Frequently Asked Questions

Can I drive my car with a P0628 code?
It is not recommended. A low fuel pump control circuit can cause the pump to fail, leading to stalling or inability to start the car. This is a safety hazard, especially in traffic.
What does fuel pump A control circuit low mean?
It means the PCM sees lower than expected voltage or current in the circuit that controls the fuel pump. This can be due to a faulty pump, relay, wiring, or PCM.
How much does it cost to fix P0628?
The cost varies: a fuel pump relay is $10-30; a fuel pump assembly can be $100-400; labor costs $100-300. DIY can save labor costs.
Will a bad fuel pump relay cause P0628?
Yes, a faulty relay is a common cause. Check the relay before replacing the pump.
Can low fuel cause P0628?
No, low fuel does not cause this code. It is an electrical issue, not a fuel level issue.

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