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.
What Does the P018C Code Mean?
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.
What are the Common Causes of the P018C Code?
- Faulty PCM
- Bad fuel pressure sensor
- Issues with the fuel pressure sensor or PCM wiring
- Base fuel system problems, such as a faulty fuel pump
What are the Common Symptoms of the P018C Code?
- Illuminated check engine light
- Engine performance problems, such as stalling and rough running
- Higher fuel consumption
How to Diagnose the P018C Code
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.
How to Fix the P018C Code
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.
Getting a Replacement Fuel Pressure Sensor for Your Vehicle
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.
You won’t even have to step outside your home to get your hands on a brand-new fuel pressure sensor for your vehicle. All you need to do is use your mobile phone and visit CarParts.com. Input your daily driver’s year, make, and model into our vehicle selector to narrow down the catalog to compatible parts.
To guarantee their quality, we source our fuel pressure sensors from the most trusted manufacturers in the industry. All our products are on hand and ready to ship from strategically located warehouses across the US. This means you’ll be able to receive your order in only a few days.
Don’t hold off on replacing a faulty fuel pressure sensor. Check out our high-quality fuel pressure sensors now at CarParts.com.
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