AutoCodes – GMC – P00C9 2014 GMC Sierra

P00C9 2014 GMC Sierra Code - Fuel Pressure Regulator High Control Circuit Low Voltage

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: P00C9 2014 GMC Sierra indicates Fuel Pressure Regulator High Control Circuit Low Voltage.
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 247

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 P00C9 2014 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 a short to ground in the high-pressure fuel pump actuator high control circuit.

OBDII Code P00C9 2014 GMC Sierra - Fuel Pressure Regulator High Control Circuit Low Voltage - AutoCodes.com — P00C9 2014 GMC Sierra Code - Fuel Pressure Regulator High Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P00C9 2014 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 P00C9 2014 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 P00C9 2014 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 P00C9 2014 GMC Sierra code?

Need more information on how to fix the P00C9 2014 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 P00C9 2014 GMC Sierra Code

1. What are common symptoms of OBDII code P00C9 in a 2014 GMC Sierra?

- Common symptoms include rough idling, decreased fuel efficiency, engine misfires, and a lack of power during acceleration.

2. What can cause the OBDII code P00C9 in a 2014 GMC Sierra?

- The code P00C9 typically indicates a problem with the fuel pressure regulator high control circuit experiencing low voltage, which can be caused by issues such as a faulty fuel pressure regulator, damaged wiring, or a malfunctioning PCM.

3. How can I diagnose the OBDII code P00C9 in my 2014 GMC Sierra?

- Diagnosing the code P00C9 involves using a scan tool to read the code, inspecting the fuel pressure regulator and its wiring for any visible damage, and checking the voltage levels in the control circuit.

4. Can I continue driving my 2014 GMC Sierra with the OBDII code P00C9?

- It is not recommended to continue driving your vehicle with the code P00C9 present, as it can lead to potential engine performance issues and further damage if left unresolved.

5. How do I repair the OBDII code P00C9 in my 2014 GMC Sierra?

- Repairing the code P00C9 may involve replacing the fuel pressure regulator, repairing or replacing damaged wiring in the control circuit, and resetting the fault codes with a scan tool.

6. Is it possible to reset the OBDII code P00C9 in a 2014 GMC Sierra without making any repairs?

- While you can clear the code temporarily with a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

7. How much does it cost to fix the OBDII code P00C9 in a 2014 GMC Sierra?

- The cost of fixing the code P00C9 can vary depending on the extent of the issue, the parts needed for repair, and whether you choose to do the repairs yourself or take your vehicle to a mechanic.

8. Can a DIY enthusiast repair the OBDII code P00C9 in a 2014 GMC Sierra?

- If you have the necessary tools, knowledge, and experience working on automotive systems, you may be able to repair the code P00C9 yourself by following repair guides or consulting with experts.

9. Are there any preventive maintenance tips to avoid the OBDII code P00C9 in a 2014 GMC Sierra?

- Regularly inspecting and maintaining your vehicle's fuel system, including the fuel pressure regulator, can help prevent issues that may trigger the code P00C9.

10. How long does it typically take to repair the OBDII code P00C9 in a 2014 GMC Sierra?

- The repair time for the code P00C9 can vary depending on the complexity of the issue, the availability of parts, and whether you are doing the repairs yourself or taking your vehicle to a professional mechanic.