In a returnless fuel system, a fuel pressure sensor measures the force exerted by the fluid flowing through the fuel rail. It sends its readings to the fuel pump control module (FCM) or the powertrain control module (PCM). The computer adjusts fuel system pressure to continue setting the best fuel-air mixture for the engine to combust.
If the control module does not detect a normal change in fuel pressure from the fuel pressure sensor after activating the pump, it will log a P018C code.
The diagnostic trouble code (DTC) P018C indicates “Fuel Pressure Sensor “B” Circuit Low.”
Whenever you drive your car, the engine will need different amounts of fuel. Any shift in the flow through the fuel rail will result in a change in pressure. The fuel pressure sensor turns these pressure changes into signal voltages and sends them to the control module.
The control module adjusts fuel system pressure using these readings.
The control module compares the signal voltage from the fuel pressure sensor with data stored in its memory. If it detects a lower-than-normal voltage signal that is different from the expected signal, it will turn on the check engine light. It will also log the OBD-II code P018C.
Note: The definition of code P018C can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
Diagnosing your vehicle for the reason behind the P018C code takes some effort. Inspect the wiring leading to the fuel pressure sensor for any signs of damage or loose connectors.
If the wires are clear, use a scan tool to monitor the desired and actual l fuel pressures. If there is a discrepancy, start the engine. This should raise the signal voltage as well. If it doesn’t, the fuel pressure sensor is probably at fault.
Here are some videos that may give you an idea of what the process might involve:
If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a professional mechanic.
Attempting to fix a P018C code can become a frustrating 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.
For DIYers with advanced technical knowledge and hands-on experience, it will be helpful to rely on the appropriate repair manual or refer to an online repair database.
A damaged fuel pressure sensor is usually the culprit behind a P018C code, which means replacing it would clear the trouble code. Fortunately, getting a replacement fuel pressure sensor is easy when you shop online here at CarParts.com.
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