AutoCodes – GMC – P0279 2014 GMC Sierra

P0279 2014 GMC Sierra Code - Cylinder 7 Injector Control Circuit Low Voltage

Quick Answer

The Engine Control Module (ECM) supplies voltage to each Fuel Injector on the high control circuits. Common causes include Dirty Fuel Injector 7, Faulty Fuel Injector 7, Plugged Fuel Injector 7. 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: P0279 2014 GMC Sierra indicates Cylinder 7 Injector Control Circuit Low Voltage.
Common causes: Common causes include Dirty Fuel Injector 7, Faulty Fuel Injector 7, Plugged Fuel Injector 7.
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 151

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0279 2014 GMC Sierra Description

The Engine Control Module (ECM) supplies voltage to each Fuel Injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector control circuit is shorted to ground for greater than 2 s.

OBDII Code P0279 2014 GMC Sierra - Cylinder 7 Injector Control Circuit Low Voltage - AutoCodes.com — P0279 2014 GMC Sierra Code - Cylinder 7 Injector Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0279 2014 GMC Sierra?

Dirty Fuel Injector 7
Faulty Fuel Injector 7
Plugged Fuel Injector 7
Fuel injector 7 harness is open or shorted
Fuel injector 7 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0279 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

A clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0279 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 P0279 2014 GMC Sierra code?

Need more information on how to fix the P0279 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 P0279 2014 GMC Sierra Code

1. What does the OBDII code P0279 mean on a 2014 GMC Sierra?

P0279 indicates a low voltage issue in the injector control circuit for Cylinder 7, meaning the engine control module (ECM) is detecting insufficient voltage to properly operate the fuel injector.

2. What are common symptoms of code P0279 in a 2014 GMC Sierra?

Common symptoms include rough idling, misfiring, reduced engine performance, poor fuel economy, and in some cases, the engine may not start.

3. What causes the P0279 code to trigger in a 2014 GMC Sierra?

Causes include a faulty fuel injector, damaged or corroded wiring or connectors in the injector circuit, a bad ECM, or issues with the injector driver circuit.

4. How can I diagnose the P0279 code on my 2014 GMC Sierra?

Use a scan tool to confirm the code, inspect the wiring and connectors for Cylinder 7, test the fuel injector's resistance with a multimeter, and check for proper voltage at the injector's connector.

5. Can I drive my 2014 GMC Sierra with the P0279 code?

Driving with this code is not recommended, as it can lead to further engine damage, reduced fuel efficiency, and unsafe driving conditions due to poor performance.

6. How is code P0279 typically repaired on a 2014 GMC Sierra?

Repairs may involve replacing the faulty fuel injector, repairing or replacing damaged wiring or connectors, or, in rare cases, replacing the ECM if itâ€™s determined to be defective.

7. How much does it cost to fix the P0279 code on a 2014 GMC Sierra?

Repair costs vary but typically range from $150 to $300 for a new fuel injector, plus labor. Wiring repairs or ECM replacement can increase the cost significantly.

8. Can a dirty fuel injector cause the P0279 code in a 2014 GMC Sierra?

A dirty injector is unlikely to cause this specific code, as P0279 is related to low voltage in the circuit, not fuel flow. However, cleaning the injector can help rule out other performance issues.

9. What tools are needed to troubleshoot the P0279 code on a 2014 GMC Sierra?

Youâ€™ll need an OBDII scan tool, a digital multimeter for voltage and resistance checks, and potentially a wiring diagram for the injector circuit.

10. Can the P0279 code clear itself on a 2014 GMC Sierra?

The code may clear temporarily if the issue is intermittent, but it will likely return until the underlying problem with the injector control circuit is resolved.