AutoCodes – GMC – P018C GMC

P018C GMC 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 GMC 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 5,119

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P018C GMC 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 GMC - Fuel Pressure Sensor 'B' Circuit Low - AutoCodes.com — P018C GMC Code - Fuel Pressure Sensor 'B' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P018C GMC?

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 GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P018C GMC 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 GMC code?

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

Need Help with the Code?

Get the P018C GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P018C 2014 GMC Sierra — Fuel Pressure Sensor 'B' Circuit Low
P018C 2015 GMC Sierra — Fuel Pressure Sensor 'B' Circuit Low
P018C 2016 GMC Sierra — Fuel Pressure Sensor 'B' Circuit Low
P018C 2017 GMC Sierra — Fuel Pressure Sensor 'B' Circuit Low
P018C 2018 GMC Sierra — Fuel Pressure Sensor 'B' Circuit Low

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 GMC Code

1. What are the common symptoms of OBDII code P018C (GMC)?

The common symptoms of code P018C include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P018C (GMC) indicate?

Code P018C indicates a low voltage condition in the fuel pressure sensor 'B' circuit in a GMC vehicle.

3. What are the possible causes of OBDII code P018C (GMC)?

Possible causes of code P018C include a faulty fuel pressure sensor, damaged wiring or connectors in the circuit, or issues with the engine control module.

4. How can I diagnose the cause of OBDII code P018C (GMC)?

Diagnosing code P018C typically involves using a scan tool to read the code, checking the fuel pressure sensor and its wiring for damage, and testing the sensor's voltage output.

5. Can I continue driving with OBDII code P018C (GMC) present?

It is not recommended to continue driving with code P018C active, as it can lead to further engine problems and potential vehicle breakdowns.

6. How can I repair OBDII code P018C (GMC)?

Repairing code P018C may involve replacing the fuel pressure sensor, repairing damaged wiring or connectors, and clearing the code with a scan tool.

7. Is it possible to reset OBDII code P018C (GMC) without fixing the underlying issue?

Resetting the code without addressing the underlying issue may temporarily turn off the check engine light, but the problem will likely reoccur if not properly repaired.

8. Are there any DIY tips for fixing OBDII code P018C (GMC)?

DIY tips for addressing code P018C include checking the sensor's wiring for visible damage, ensuring proper sensor connection, and consulting the vehicle's service manual for specific repair instructions.

9. How much does it cost to fix OBDII code P018C (GMC) at a repair shop?

The cost of fixing code P018C at a repair shop can vary depending on the exact cause of the issue, but it may range from $100 to $300 or more, including parts and labor.

10. Can a mechanic help me with OBDII code P018C (GMC) if I'm unsure how to proceed?

Yes, a qualified mechanic can assist in diagnosing and repairing code P018C in your GMC vehicle, ensuring the issue is properly resolved and the check engine light is turned off.