AutoCodes – GMC – P00C8 2015 GMC Sierra

P00C8 2015 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 2015 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 355

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 2015 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 2015 GMC Sierra - Fuel Pressure Regulator High Control Circuit - AutoCodes.com — P00C8 2015 GMC Sierra Code - Fuel Pressure Regulator High Control Circuit

What does this mean?

What are the Possible Causes of the DTC P00C8 2015 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 2015 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 2015 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 2015 GMC Sierra code?

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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 2015 GMC Sierra Code

1. What does the OBDII code P00C8 mean on a 2015 GMC Sierra?

P00C8 indicates an issue with the fuel pressure regulator high control circuit, meaning the circuit is not functioning as expected.

2. What are the common symptoms of code P00C8 on a 2015 GMC Sierra?

Symptoms may include poor engine performance, difficulty starting, reduced fuel efficiency, and an illuminated check engine light.

3. What causes the P00C8 code on a GMC Sierra?

Potential causes include a faulty fuel pressure regulator, damaged wiring or connectors in the circuit, or a malfunctioning powertrain control module (PCM).

4. Can a dirty fuel filter trigger a P00C8 code?

Indirectly, yes. A clogged fuel filter can cause inconsistent fuel pressure, which may lead to the PCM detecting a problem with the fuel pressure regulator circuit.

5. How do I diagnose the P00C8 code on a 2015 GMC Sierra?

Start by inspecting the fuel pressure regulator, wiring, and connectors for damage. Use a multimeter to test the circuit for continuity and proper voltage. If no issues are found, check the PCM.

6. Is it safe to drive with the P00C8 code active?

Driving with this code is not recommended as it can lead to poor engine performance and potential damage to the fuel system or engine.

7. How much does it cost to repair the P00C8 code on a GMC Sierra?

Repair costs vary but typically range from $100 to $500, depending on whether the issue is with the fuel pressure regulator, wiring, or PCM.

8. Can a software update fix the P00C8 code on the GMC Sierra?

In some cases, a PCM software update may resolve the issue if it is related to a programming error. Check with a dealership or qualified mechanic.

9. How can I prevent the P00C8 code from reoccurring?

Regular maintenance, such as inspecting the fuel system, replacing the fuel filter, and addressing wiring issues promptly, can help prevent this code.

10. Does the P00C8 code always mean the fuel pressure regulator is bad?

No, the code could also indicate issues with the wiring, connectors, or PCM, so a thorough diagnosis is necessary before replacing any parts.