The P0628 trouble code indicates that the fuel pump “A” control circuit is experiencing low voltage. This circuit is responsible for controlling the operation of the fuel pump, which delivers fuel from the fuel tank to the engine.
P0628 Fuel Pump “A” Control Circuit Low
Code symptoms P0628.
1. Check Engine Light (CEL) illuminated on the dashboard.
2. Vehicle may not start or experience difficulty starting.
3. Lack of fuel pressure causing engine to stall or run rough.
4. Fuel pump may not activate when ignition is turned on.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0628.
1. Faulty fuel pump.
2. Low voltage in the fuel pump “A” control circuit.
3. Corroded or loose connectors in the fuel pump circuit.
4. Faulty fuel pump relay.
5. Defective fuel pump control module.
6. Battery voltage too low.
7. Charging system malfunction.
Code Solutions P0628.
1. Check the battery voltage and charging system to ensure they are operating properly. Replace the battery or alternator if necessary.
2. Inspect the wiring and connectors associated with the fuel pump “A” control circuit for any signs of damage, corrosion, or looseness. Repair or replace wiring and connectors as needed.
3. Test the fuel pump to ensure it is functioning properly. Replace if necessary.
4. Test the fuel pump relay for proper operation. Replace the relay if it is faulty.
5. Check the fuel pump control module for proper function. Replace if necessary.
6. Clear the trouble codes and test drive the vehicle to see if the P0628 code returns. If it does, further diagnosis may be necessary.