What is the P0628 Fault-error Code?
The P0628 fault-error code is detected by your vehicle's OBD-II diagnostic system as an indication of a problem with the fuel pump control circuit. Specifically, this code refers to a "Fuel Pump A Control Circuit Low" error. This indicates that the voltage required for the fuel pump to operate properly is lower than it should be.
Fuel Pump A: A circuit that controls the fuel pump in your vehicle, or a system that communicates with the engine control unit (ECU).
Control Circuit Low: The electrical voltage required for the fuel pump to operate is not at a sufficient level or the circuit is not closing completely.
Symptoms
Common symptoms that can cause a P0628 error code on a vehicle include:
Engine Performance Problems: The vehicle may be difficult to start or may not start at all (the engine will not start at all). The idle may fluctuate or hesitate. The vehicle may lose power during acceleration.
Fuel Pressure Problems: Due to low fuel pressure, the engine cannot be supplied with fuel properly. Fuel economy may decrease because the engine cannot perform proper combustion.
Check Engine Light on Dashboard: The Check Engine light or engine fault warning light comes on. This means that code P0628 can be determined by the diagnostic device.
Unusual Noises: You may hear strange noises from the fuel pump (for example, a growling noise or a continuous straining sound when trying to start).
Engine Stalling: The vehicle may suddenly stall while driving or idling.
Temporary Starting and Stopping Problems: Once the vehicle is started, it may run properly for a while, but the engine may stop shortly after.
Loss of Power: The vehicle may lose power due to fuel supply problems, especially when climbing hills or at high speeds.
Reasons
Possible causes of error code P0628:
Fuel Pump Relay or Fuse Failure: The relay or fuse used to operate the fuel pump may have failed. A blown fuse or a faulty relay will cause an interruption in the circuit and the pump will not run.
Fuel Pump Failure: The fuel pump motor may be broken or not drawing enough electrical current to operate. This prevents the pump from sending fuel to the engine at sufficient pressure.
Electrical Connection Problems: There may be a break or interruption, loose connections, corrosion or oxidation in the electrical cables going to the fuel pump.
Short circuits or grounding problems can also cause this error.
ECU (Engine Control Unit) Problem: The engine control unit (ECU) may not be operating the fuel pump control circuit properly. If there is a problem with the programming or internal hardware of the ECU, it will not be sending the correct signal to the fuel pump.
Low Battery Voltage or Alternator Problems: When the battery voltage is low, the fuel pump cannot provide the energy it needs to function properly. When the alternator is not producing enough voltage, this can cause this error.
Fuel Pump Control Module Failure: The fuel pump control module is a component used to regulate voltage and operate the pump.
If the module fails, the pump may not work or a low voltage problem may occur.
Water or Moisture Ingress: If water/moisture enters the fuel pump relay, wiring harness or connection points, the circuit may short or increase resistance.
Sensor Issues: Some vehicles have pressure sensors built into the fuel pump system. A sensor failure can cause the system to operate incorrectly.
Rare Causes
Using the wrong fuel: Using a fuel other than the recommended fuel for the fuel system may cause problems.
Faulty Repair or Replacement: Using the wrong parts or breaking the wiring during a previous repair.
To resolve the issue, a detailed check is recommended:
Check fuel pump relay and fuse.
Examine the wiring and connections.
Test the operation of the fuel pump and control module.
Assess whether the ECU is faulty.
Check the battery and charging system.
Solutions
To resolve the P0628 error code, you can follow the steps below. This process is necessary to identify the source of the problem and fix it correctly.
Reset and Test Error Code: Read and reset error code with OBD-II device.
Restart the vehicle to see if the problem is a temporary electrical fault.
Check Fuel Pump Relay and Fuse:
Check the fuse: If the fuel pump fuse is blown, replace it.
Test the relay: If the relay is not working properly, replace it with a new relay.
Check the relay and fuse box for corrosion or loose connections.
Test the Fuel Pump
Perform an electrical test: Measure the voltage to the fuel pump with a multimeter.
If the pump is not running or is receiving low voltage, the pump motor may be faulty and needs to be replaced.
If the fuel pump is working properly, there may be a problem with the control module or electrical circuit.
Examine the Electrical Circuit
On all wires going to the fuel pump:
Check for disconnection, short circuit, loose connection and corrosion.
Check the grounding connection: a poor grounding can cause this problem.
Battery and Alternator Control
Check the battery voltage. Low battery voltage can prevent the fuel pump from working properly.
Inspect the alternator charging system. An inadequate charging system may cause low voltage in the circuit.
Test Fuel Pump Control Module
If your vehicle has a fuel pump control module, test the module to see if it is working.
If the control module is defective, it may need to be replaced.
ECU (Engine Control Unit) Control
Test the ECU outputs that control the fuel pump.
If the ECU is found to be not working properly, a software update or ECU replacement may be required.
Sensor and Pressure Test
Check the pressure sensors and related sensor wiring associated with the fuel pump.
Test with special equipment to measure fuel system pressure.
Troubleshoot Water or Moisture Problems
Water or moisture may have gotten into the fuel pump relay and fuse box. If so, dry and clean.
Get Expert Help
Take your vehicle to a repair shop or authorized service center and have a professional diagnosis performed.
Complex problems with electrical circuits may require special equipment and expertise.
Long Term Effects
The long-term effects of the P0628 error code can be serious due to the effects it can have on your vehicle's fuel system and overall performance. If this error is not corrected in a timely manner, the following issues may occur:
Decrease in Engine Performance
If the fuel pump is not working properly, this will result in not enough fuel reaching the engine.
You may experience performance issues such as low engine power, rough idling, acceleration problems and engine stalling.
Fuel System Damages
If the fuel pump is forced to operate with constant low voltage, the pump can overheat and fail completely.
Other components in the fuel system (e.g. fuel injectors) can also be affected by this fault and suffer damage in the long run.
Engine Failure to Start
If the fuel pump failure progresses, the engine fuel supply may be cut off completely. In this case, the vehicle may not start or may suddenly stop while driving.
Decrease in Vehicle Fuel Efficiency
When the fuel pump is not working properly, the engine combustion process is not efficient. This can lead to increased fuel consumption and higher costs.
Spread of Electrical System Problems
If the P0628 code is caused by low voltage or electrical connection issues, these issues can affect other electrical components of the vehicle over time.
Especially critical systems such as the battery, alternator and ECU may be damaged.
ECU (Engine Control Unit) Faults
The ECU can become overloaded by constantly trying to run the fuel pump. This can cause damage or complete failure of the ECU.
ECU replacement may require a costly repair.
The P0628 error code indicates an issue with the control circuit of the fuel pump, which is a critical component of the vehicle's overall fuel system. You should take this error code seriously and have the necessary checks performed to avoid long-term effects of the problem.
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