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AutoCodes – Generic – P018C

P018C Code - Fuel Pressure Sensor 'B' Circuit Low

Quick Answer

The Powertrain Control Module (PCM) provides a 5-Volt supply to the Fuel Rail Pressure Sensor (FRPS). Common causes include Faulty Fuel Pressure Sensor 'B', Fuel Pressure Sensor 'B' harness is open or shorted, Fuel Pressure Sensor 'B' circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P018C indicates Fuel Pressure Sensor 'B' Circuit Low.
Common causes
Common causes include Faulty Fuel Pressure Sensor 'B', Fuel Pressure Sensor 'B' harness is open or shorted, Fuel Pressure Sensor 'B' circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 27,966
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on May 29, 2022
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Code P018C Description

The Powertrain Control Module (PCM) provides a 5-Volt supply to the Fuel Rail Pressure Sensor (FRPS). The PCM also provides a ground on the sensor return circuit. The Fuel Rail Pressure Sensor provides a signal to the PCM on the Fuel Rail Pressure Sensor Signal circuit. This sensor signal voltage changes based on the pressure in the fuel rail. The PCM will detect a low signal voltage at low rail pressures. The PCM will detect a high signal voltage during high rail pressure conditions. The PCM will light the MIL lamp immediately after the diagnostic runs and fails. During this time the customer may experience a power and or speed derate. The PCM will turn off the MIL light after the diagnostic runs and passes in four consecutive drive cycles.
OBDII Code P018C - Fuel Pressure Sensor 'B' Circuit Low - AutoCodes.com
P018C Code - Fuel Pressure Sensor 'B' Circuit Low
What does this mean?

What are the Possible Causes of the DTC P018C?

  • Faulty Fuel Pressure Sensor 'B'
  • Fuel Pressure Sensor 'B' harness is open or shorted
  • Fuel Pressure Sensor 'B' circuit poor electrical connection

How to Fix the DTC P018C?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes













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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P018C code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P018C code?

Need more information on how to fix the P018C code? Get Access to Factory Service Manuals

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Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P018C Code

1. What does the OBDII code P018C mean?

P018C indicates that the fuel pressure sensor "B" circuit is reading a voltage lower than expected by the powertrain control module (PCM), suggesting a potential problem with the sensor or its circuit.

2. What are the common symptoms of a P018C code?

Symptoms may include poor fuel efficiency, engine misfires, hard starts, stalling, reduced engine performance, or the illumination of the check engine light.

3. What causes the P018C code to appear?

Common causes include a faulty fuel pressure sensor, damaged or corroded wiring, loose electrical connections, or a malfunctioning PCM.

4. Can I drive my car with a P018C code?

Driving with a P018C code is not recommended, as it can lead to poor engine performance, increased fuel consumption, and potential engine damage if the fuel pressure is not properly regulated.

5. How is the P018C code diagnosed?

Diagnosis typically involves checking the fuel pressure sensor, inspecting wiring and connectors for damage, testing the sensor's electrical signals with a multimeter, and using a scan tool to monitor fuel pressure data.

6. How do you fix a P018C code?

Repairs may include replacing a faulty fuel pressure sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/updating the PCM.

7. Where is the fuel pressure sensor "B" located?

The fuel pressure sensor "B" is typically located on the fuel rail, fuel line, or inside the fuel tank, depending on the vehicle's design.

8. How much does it cost to fix a P018C code?

The cost can vary depending on the exact issue, but replacing a fuel pressure sensor typically costs between $100 and $300, including parts and labor.

9. Can a bad fuel pump cause the P018C code?

Yes, a failing fuel pump can impact the fuel pressure and trigger the P018C code, as the sensor may receive an abnormal reading.

10. Does clearing the code fix the P018C issue?

Clearing the code may temporarily turn off the check engine light, but it won't fix the underlying issue. The root cause must be repaired to prevent the code from returning.

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