AutoCodes – GMC – P00C8 2018 GMC Sierra

P00C8 2018 GMC Sierra Code - Fuel Pressure Regulator High Control Circuit

Quick Answer

High-pressure fuel is regulated by the high-pressure fuel pump actuator, which is a part of the high-pressure fuel pump. Common causes include Faulty High-Pressure Fuel Pump, High-Pressure Fuel Pump harness is open or shorted, High-Pressure Fuel Pump electrical circuit poor 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: P00C8 2018 GMC Sierra indicates Fuel Pressure Regulator High Control Circuit.
Common causes: Common causes include Faulty High-Pressure Fuel Pump, High-Pressure Fuel Pump harness is open or shorted, High-Pressure Fuel Pump electrical circuit poor 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 402

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 16, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P00C8 2018 GMC Sierra Description

High-pressure fuel is regulated by the high-pressure fuel pump actuator, which is a part of the high-pressure fuel pump. The high-pressure fuel pump actuator is a solenoid valve. The Engine Control Module (ECM) provides battery voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high-pressure fuel pump actuator, and the low control circuit driver Pulse-Width Modulates (PWM) the low control circuit to the ground. The ECM monitors the voltage on the circuits to detect a failure. The Diagnostic Trouble Code (DTC) will set if the ECM detects an open circuit in the high-pressure fuel pump actuator high control circuit.

OBDII Code P00C8 2018 GMC Sierra - Fuel Pressure Regulator High Control Circuit - AutoCodes.com — P00C8 2018 GMC Sierra Code - Fuel Pressure Regulator High Control Circuit

What does this mean?

What are the Possible Causes of the DTC P00C8 2018 GMC Sierra?

Faulty High-Pressure Fuel Pump
High-Pressure Fuel Pump harness is open or shorted
High-Pressure Fuel Pump electrical circuit poor connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P00C8 2018 GMC Sierra?

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

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P00C8 2018 GMC Sierra 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 P00C8 2018 GMC Sierra code?

Need more information on how to fix the P00C8 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 P00C8 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P00C8 in a 2018 GMC Sierra related to the Fuel Pressure Regulator High Control Circuit?

The common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What can cause the OBDII code P00C8 to trigger in a 2018 GMC Sierra?

The code P00C8 can be triggered by issues such as a faulty fuel pressure regulator, damaged wiring or connectors in the control circuit, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P00C8 in my 2018 GMC Sierra?

Diagnosing the issue typically involves using a scan tool to check for the code, inspecting the fuel pressure regulator and its connections, and testing the control circuit for any faults.

4. Can I continue driving my 2018 GMC Sierra with the OBDII code P00C8 present?

It is not recommended to continue driving with the code present, as it can lead to poor engine performance and potentially cause further damage to the vehicle.

5. How can I repair the Fuel Pressure Regulator High Control Circuit issue indicated by OBDII code P00C8 in my 2018 GMC Sierra?

Repairing the issue may involve replacing the fuel pressure regulator, repairing or replacing damaged wiring or connectors, or reprogramming the engine control module.

6. Are there any DIY tips for troubleshooting OBDII code P00C8 in a 2018 GMC Sierra?

While some basic inspections like checking for loose connections or damaged wiring can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for a thorough diagnosis and repair.

7. Will resetting the OBDII code P00C8 in my 2018 GMC Sierra make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear after some driving cycles.

8. How much can I expect to pay for repairing the Fuel Pressure Regulator High Control Circuit problem associated with OBDII code P00C8 in my 2018 GMC Sierra?

The cost of repair can vary depending on the exact cause of the issue and labor rates in your area. It's best to get a diagnosis from a mechanic for an accurate estimate.

9. Can a clogged fuel filter cause OBDII code P00C8 to trigger in a 2018 GMC Sierra?

While a clogged fuel filter can impact fuel pressure, it is not a direct cause of the P00C8 code. However, it's essential to ensure the entire fuel system is in good working order.

10. Is it safe to drive my 2018 GMC Sierra to the repair shop with the OBDII code P00C8 illuminated?

If the vehicle is exhibiting severe symptoms like stalling or rough idling, it's best to have it towed to the repair shop to prevent further damage. If the symptoms are minor, you may drive cautiously to the shop.