P0628 code — how to fix error fast

Electric issues in vehicles are often overlooked by drivers even though they can lead to quite a few serious issues, and the same goes for problems indicated by the P0628 code. It’s one of the most common OBD2 codes that have to do with the car’s fuel delivery system, which means it requires your immediate attention.

If you’ve diagnosed this issue in your car, chances are that you’ll need to quickly find a solution if you don’t want to deal with the consequences. So, this guide on the P0628 code meaning, causes, and solutions should do the trick for you.

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What does the P0628 code mean?

The P0628 code is a generic powertrain code that indicates a malfunction in the fuel pump control module circuit. This code is usually found in vehicles with diesel engines and is associated with several symptoms that can affect the vehicle’s performance and safety.

When this code appears, the check engine light will illuminate, and the vehicle may enter into a failsafe mode, which can limit the engine’s power and speed.

What causes the P0628 code?

There are quite a few issues that could lead to the code to appear in your car, so here’s a complete list that you can use to pinpoint the source of the issue:

Faulty fuel pump control module

The fuel pump control module is responsible for regulating the fuel pressure in the system. If this module is faulty, it can cause the P0628 code to appear. This can occur due to wear and tear or damage to the module’s wiring.

Damaged wiring or connectors

Damaged wiring or connectors in the fuel pump control circuit can also trigger this code. Corrosion, fraying, or breakage of the wires can cause a disruption in the circuit, leading to the code’s appearance.

Failed fuel pump relay

The fuel pump relay is responsible for providing power to the fuel pump. If this relay fails, it can cause the P0628 code to appear. This can occur due to wear and tear or damage to the relay’s wiring.

Failed fuel pump

A failed fuel pump can also cause the code to appear. This can occur due to a clogged fuel filter, a faulty fuel pressure regulator, or a damaged fuel pump.

Which car models does the P0628 code affect the most?

The P0628 code is more commonly found in diesel engine vehicles, particularly in Ford, Dodge, and Chevrolet models. These models often have a higher incidence of the code due to the design of their fuel pump control systems, and here’s our shortlist:

• Ford Focus: Owners of 2012-2018 models have reported issues with the fuel pump control module.
• Chevy Cruze: Issues with the fuel pump control module have been reported in some 2011 and 2012 models.
• Mercedes-Benz C-Class: Fuel pump control module issues have been reported in some 2008-2014 models.

How to diagnose the P0628 code

Diagnosing the P0628 code requires a series of steps to determine the cause of the problem. Here are some of the methods used to diagnose the code:

Use an OBD-II scanner

Using an OBD-II scanner, you can retrieve the trouble codes stored in the vehicle’s computer. This will give you an idea of what’s causing the code to appear, allowing you to start your diagnosis.

Visual inspection

A visual inspection of the fuel pump control circuit can reveal any signs of damage or wear. You can check for any frayed wires, corrosion, or loose connections.

Fuel pressure test

A fuel pressure test can help diagnose the P0628 code by determining if the fuel pump is functioning correctly. If the pressure is lower than the manufacturer’s specifications, it may indicate a problem with the fuel pump.

How to fix the P0628 code

Fixing the P0628 code requires determining the cause of the code and taking the necessary steps to fix it. Here are some of the potential fixes for each cause of the code:

Replace a faulty fuel pump control module

Replacing the faulty fuel pump control module is the most common fix for the P0628 code. This involves removing the old module and installing a new one.

Deal with damaged wiring or connectors

Repairing or replacing the damaged wiring or connectors can help fix the code. This may involve splicing new wires or replacing damaged connectors.

Failed fuel pump relay

If the fuel pump relay seems to be worn off, the pump won’t be able to get an electric power supply and that means you should replace the relay to fix the code.

Failed fuel pump

Finally, you may need to replace the fuel pump itself which can be a pretty demanding task that requires professional assistance. Plus, you’ll need to spend around $500 on average or even up to $1000 for a new pump.

How to prevent the P0628 code

Preventing the P0628 code requires proper maintenance of the fuel pump control system. Here are some tips on how to prevent the code from appearing:

• Perform regular maintenance
• Properly service the vehicle’s fuel delivery system
• Perform regular fuel filter changes and pressure inspections

Using the vehicle properly can also help prevent the code from appearing. Avoiding overloading the vehicle, driving on rough roads, and driving with low fuel levels can help reduce the strain on the fuel pump control system.

Our take

Since the P0628 code can have a significant impact on the performance and safety of a vehicle, taking care of this code as soon as possible is crucial for properly taking care of your car.

Not only will you be able to avoid costly repairs of the fuel delivery system or replacing the pump, but you’ll also prevent the issue from affecting your engine’s performance this way.