p0628 fuel pump a control circuit low
P0628 Fuel Pump A Control Circuit Low
Definition: This diagnostic trouble code (DTC) indicates that there is a low voltage condition in the fuel pump “A” control circuit. The engine control module (ECM) has detected an issue with the electrical circuit responsible for controlling the operation of the fuel pump.
P0628 – Fuel Pump A Control Circuit Low
Typical Severity: Moderate
Common Causes
P0628 – Fuel Pump A Control Circuit Low
Common causes:
- Faulty fuel pump relay
- Defective fuel pump driver module
- Short circuit or open circuit in the wiring related to the fuel pump control circuit
- Corrosion or poor connections in the fuel pump control circuit
- Fuel pump itself may be malfunctioning
Common Misdiagnosis
OBD2 Code: P0628
Description: Fuel Pump A Control Circuit Low
Common Misdiagnosis: Replacing the fuel pump without checking for wiring issues or a faulty fuel pump relay.
Common Diagnostic Steps
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OBD2 Code: P0628 – Fuel Pump A Control Circuit Low
Description: This code indicates that the fuel pump control module is detecting a low voltage condition in the fuel pump “A” control circuit.
Common Diagnostic Steps:
- Check for any blown fuses related to the fuel pump circuit and replace if necessary.
- Inspect the wiring and connectors for damage, corrosion, or loose connections in the fuel pump circuit.
- Test the battery voltage and charging system to ensure proper voltage supply.
- Use a multimeter to check for continuity and resistance in the fuel pump control circuit wires.
- Examine the fuel pump relay for proper operation; replace if faulty.
- Verify that there is no blockage or restriction in the fuel lines affecting pressure delivery.
- If equipped, test the functionality of the Fuel Pump Driver Module (FPDM) or Powertrain Control Module (PCM).
- If all else fails, consider testing or replacing the fuel pump itself as it may be defective.