AutoCodes – Generic – P00C8

P00C8 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 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 7,190

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 Jun 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P00C8 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 - Fuel Pressure Regulator High Control Circuit - AutoCodes.com — P00C8 Code - Fuel Pressure Regulator High Control Circuit

What does this mean?

What are the Possible Causes of the DTC P00C8?

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?

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 P00C8 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 code?

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

Need Help with the Code?

Get the P00C8 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P00C8 Buick — Fuel Pressure Regulator High Control Circuit
P00C8 Cadillac — Fuel Pressure Regulator High Control Circuit
P00C8 Chevrolet — Fuel Pressure Regulator High Control Circuit
P00C8 GMC — Fuel Pressure Regulator High Control Circuit

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 Code

1. What are the common symptoms of OBDII code P00C8 (Fuel Pressure Regulator High Control Circuit)?

The common symptoms of code P00C8 include poor fuel economy, rough idling, reduced engine performance, and potentially stalling.

2. What are the possible causes of OBDII code P00C8?

The potential causes of code P00C8 include a faulty fuel pressure regulator, issues with the fuel pressure sensor, wiring problems, or a malfunctioning engine control module (ECM).

3. How can I diagnose the cause of OBDII code P00C8?

Diagnosing code P00C8 involves using a diagnostic scanner to read the code, checking for any related trouble codes, inspecting the fuel pressure regulator and sensor, and testing the circuit for any wiring issues.

4. Can I still drive my vehicle with OBDII code P00C8?

It is not recommended to drive your vehicle with code P00C8 as it can lead to poor engine performance and potential stalling, which can be unsafe. It's best to address the issue promptly.

5. What are some repair tips for fixing OBDII code P00C8?

Repairing code P00C8 may involve replacing the fuel pressure regulator, repairing any damaged wiring, resetting the ECM, or addressing any other underlying issues causing the high control circuit fault.

6. How much does it typically cost to repair OBDII code P00C8?

The cost of repairing code P00C8 can vary depending on the specific cause of the issue, the labor rates in your area, and the cost of parts. It's recommended to get a few quotes from local mechanics for an accurate estimate.

7. Is OBDII code P00C8 a serious issue?

While code P00C8 may not always cause immediate engine failure, it can lead to poor engine performance and potentially dangerous driving conditions. It's best to address the issue promptly to prevent further damage.

8. Can a DIY enthusiast repair OBDII code P00C8 at home?

Depending on your mechanical skills and access to tools, you may be able to troubleshoot and repair code P00C8 at home. However, it's recommended to seek professional help if you're unsure or inexperienced.

9. How long does it typically take to fix OBDII code P00C8?

The repair time for code P00C8 can vary depending on the exact cause of the issue, the availability of parts, and the expertise of the mechanic. In some cases, it can be resolved within a few hours.

10. Will resetting the OBDII code P00C8 turn off the check engine light?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing code P00C8 is not addressed, the light is likely to come back on. It's important to diagnose and repair the problem.