AutoCodes – GMC – P009C GMC

P009C GMC Code - Fuel Pressure Relief Control Circuit Low

Quick Answer

The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) sensor to monitor the high side fuel pressure and the fuel rail pressure relief valve performance. Common causes include Faulty Fuel Pressure Relief Valve, Fuel Pressure Relief Valve harness is open or shorted, Fuel Pressure Relief Valve 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: P009C GMC indicates Fuel Pressure Relief Control Circuit Low.
Common causes: Common causes include Faulty Fuel Pressure Relief Valve, Fuel Pressure Relief Valve harness is open or shorted, Fuel Pressure Relief Valve 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 1,204

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 Apr 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P009C GMC Description

The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) sensor to monitor the high side fuel pressure and the fuel rail pressure relief valve performance. The fuel rail pressure relief valve is designed to release fuel pressure in the event of an overpressure condition. This diagnostic looks for excessive fuel rail pressure decay to detect an open fuel rail pressure relief valve.

OBDII Code P009C GMC - Fuel Pressure Relief Control Circuit Low - AutoCodes.com — P009C GMC Code - Fuel Pressure Relief Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P009C GMC?

Faulty Fuel Pressure Relief Valve
Fuel Pressure Relief Valve harness is open or shorted
Fuel Pressure Relief Valve circuit poor electrical connection

How to Fix the DTC P009C 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 P009C 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 P009C GMC code?

Need more information on how to fix the P009C GMC code? Get Access to Factory Service Manuals

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Get the P009C GMC code diagnosed by a professional: Find a repair shop in your area

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 P009C GMC Code

1. What are the common symptoms of OBDII code P009C GMC?

The common symptoms of code P009C include rough idling, engine stalling, decreased fuel efficiency, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code P009C GMC?

The possible causes of code P009C include a faulty fuel pressure relief control valve, wiring issues in the fuel pressure relief control circuit, or a problem with the engine control module (ECM).

3. How can I diagnose OBDII code P009C GMC?

Diagnosing code P009C typically involves using a scan tool to retrieve the code, inspecting the fuel pressure relief control valve and its wiring, and testing the ECM for proper operation.

4. Can I drive my vehicle with OBDII code P009C GMC?

It is not recommended to drive your vehicle with code P009C, as it can lead to further damage to the engine and fuel system. It's best to address the issue promptly.

5. How do I repair OBDII code P009C GMC?

To repair code P009C, you may need to replace the faulty fuel pressure relief control valve, repair any damaged wiring in the control circuit, or reprogram the ECM to resolve the issue.

6. Is it safe to reset the OBDII code P009C GMC and continue driving?

Resetting the code without addressing the underlying issue is not recommended, as the problem may persist and lead to more severe engine issues in the future. It's best to diagnose and repair the root cause of the code.

7. Can a DIY enthusiast fix OBDII code P009C GMC at home?

While some DIY enthusiasts may have the skills to address code P009C, it is recommended to have a professional mechanic diagnose and repair the issue to ensure it is properly resolved.

8. How much does it cost to repair OBDII code P009C GMC at a repair shop?

The cost of repairing code P009C can vary depending on the exact cause of the issue, the labor rates of the repair shop, and any replacement parts needed. It's best to get a diagnostic and repair estimate from a trusted mechanic.

9. Will OBDII code P009C GMC cause my vehicle to fail an emissions test?

Yes, code P009C can cause your vehicle to fail an emissions test, as it indicates a problem with the fuel pressure relief control circuit, which can impact emissions levels.

10. How often does OBDII code P009C GMC occur in GMC vehicles?

Code P009C is relatively uncommon in GMC vehicles, but it can still occur due to various factors, such as wear and tear on components or electrical issues.