P018B Code: Fuel Pressure Sensor “B” Circuit Range/Performance

Fuel pressure moves gasoline or diesel out of the tank, through the fuel rail, and to the engine’s injectors. The fuel rail pressure sensor gauges the pressure in the rail and sends voltage signals to the engine control module (ECM) or powertrain control module (PCM). The signals indicate the rail’s fuel pressure. The signal voltage is high when the pressure is high, and the voltage is low when the pressure is low. 

The computer runs performance diagnostics on the fuel pressure sensor’s signal circuit. If the control module doesn’t see the appropriate change in signal voltage while the fuel pump is running, it will log a P018B code.

What Does the P018B Code Mean?

Diagnostic trouble code (DTC) P018B stands for “Fuel Pressure Sensor “B” Circuit Range/Performance.”

Fuel rail pressure sensors are a key part of the electronic returnless fuel system, which computer modules operate. The PCM sets the fuel pressure that the engine needs and sends this setting to the power control module that runs the fuel pump. 

The fuel pressure sensor monitors the pressure and informs the ECM about any adjustments that the control module needs. The ECM uses the feedback to achieve closed loop fuel pressure control.

If the control module detects that the voltage signal stays the same while the fuel pump is operational, it will set the powertrain code P018B.

Note: The definition of code P018B can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P018B Code?

• Faulty fuel pressure sensor
• Circuit issues, such as damaged wires and poor connections
• A problem with the PCM, such as software in need of an update

What are the Common Symptoms of the P018B Code?

• Illuminated check engine light
• Engine performance problems, such as rough running and stalling
• Vehicle stuck in “limp” mode

How to Diagnose the P018B Code

The P018B code is a generic powertrain code that various makes and models can log. However, this does not mean that there is a one-size-fits-all-solution to identify its underlying problem.

If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here is a video that can give you an idea of what the process might involve:

How to Fix the P018B Code

Attempting to fix a P018B code can become a challenging task if you don’t have the right tools and know-how to test the fuel pressure sensor. In most cases, it’s best to leave the job to professionals.
If you’re a DIYer with advanced technical knowledge and hands-on experience, you can address the P018B on your own. It will be helpful to consult a repair manual or refer to an online repair database that offers vehicle-specific guides.

Replacing the Fuel Pressure Sensor to Fix DTC P018B

Since DTC P018B is typically caused by a faulty fuel pressure sensor, it’s a good idea to inspect it to see if it needs replacing. It can be tricky to find a replacement that works with your vehicle. Fortunately, shopping for an affordable yet high-quality fuel pressure sensor is easy with the help of CarParts.com.

Each of our auto parts is carefully selected by a team of professionals to guarantee quality and longevity. On top of that, our warehouses are strategically located all across the US. This means you can expect to receive your order within two business days.

To get started, download our mobile app or visit our website and use our vehicle selector. You’ll need to input necessary details like the year, make, model, and engine of your car. This way, you can easily find replacement parts designed to work with your vehicle.

Don’t let DTC P018B become a bigger problem than it has to be. Order a new fuel pressure sensor now.