What causes High-Pressure Common Rail Checksum Error? (P0148)

Three of the most common causes of a “High-Pressure Common Rail Checksum Error” (PO148) are fuel leaks, a faulty fuel control actuator, and a faulty fuel pressure sensor.

Therefore, whenever this code appears on any vehicle owner’s dashboard, it is normally best to begin troubleshooting one of the above possible causes first.

That said, let’s start by identifying the meaning of the code P0148 and the distinctions between each cause.

First of all, whenever a PO148 code is displayed on the dashboard, you need to know what it means. For instance, if you look up this code online or in your car manual, you will see that there is a problem with the fuel system.

In specific, it means that the gas is not getting to the required components in the car’s fuel system. Therefore, you may begin looking for the actual cause of this error appearing.

Common causes

1. Fuel Leak

If the P0148 is lit up on your dashboard, you need to find the cause quickly. In some situations, the gas may actually be leaking from the tank of your car. So, you need to check this out first by;

  • Using the Smell test
  • Looking for a puddle of fuel can be seen visibly under the vehicle
  • Check the gas tank for its age and corrosion

This type of gas leak is extremely dangerous to the driver and everyone around so it is crucial to handle them properly as soon as possible.

2. Faulty Fuel Control Actuator

The fuel control actuator is an electronic valve that controls the amount of fuel that enters the engine. This valve can be described as an electronic gauge that adjusts fuel while also maintaining the vehicle’s speed.

Therefore, whenever this component is faulty, the code on the vehicle that you will see is P0148 (High-Pressure Common Rail Checksum Error).

3. Faulty Fuel Pressure Sensor

Another common cause of the P0148 code ( High-Pressure Common Rail Checksum Error) coming on is a faulty fuel pressure sensor.

This component is normally located in at least one or two places, inside the tank or on top of the tank. And its main role is to keep track of the pressure in the tank, while also providing alerts when it detects evaporative leaks like a bad or loose gas cap.

Therefore, it is also important to recognize the signs and symptoms that it has gone bad (i.e. stalling, difficulty with starting the engine, weak acceleration, and bad fuel mileage).

How to fix the P0148 High-Pressure Common Rail Checksum Error?

Fixing the P0148 high-pressure common rail checksum error is dependent on the cause. Therefore, you need to identify the cause before you can determine the fix.

For instance, if there is a fuel leak that is coming from a gas tank that is corroded, a new tank may need to be installed. Or, if the problem is due to a faulty fuel control actuator or fuel pressure sensor, these devices may need to be replaced before the error can be corrected or turned off.

How much does repairing the P0148 error cost?

The cost of making these repairs are based on the fix that is needed. For instance, if this error is due to a loose gas tank, no cost is involved. On the other hand, if the gas cap is bad, the average cost can range from $96 to $101.

On the other hand, if a new gas tank installation is required, the cost of the new tank and labor can range from $800 to $1000.


If you see the code P0148 (High-Pressure Common Rail Checksum Error) on your dashboard, you need to take care of these issues right away.

Because this type of problem is linked to a gas leak in your fuel system, you need to know exactly what the cause is before addressing it properly.

Fortunately, the cause may be as simple as a loose gas cap to a gas cap that needs to be replaced. Yet, if the problem is much more serious, you may need to replace a bad gas tank with a new one.

In either case, you need to make sure that you find a solution to minimize the damage and keep everyone around you safe.

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