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Engine-Codes – GMC – P0279 2014 GMC Sierra

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

Quick Answer

The P0279 diagnostic trouble code (DTC) specifically pertains to a fault in the Cylinder 7 Injector Control Circuit on a 2014 GMC Sierra. Common causes include Faulty fuel injector in cylinder 7, Wiring issues in the control circuit, Poor connection in the circuit. 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 Faulty fuel injector in cylinder 7, Wiring issues in the control circuit, Poor connection in the circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P0279 2014 GMC Sierra Description

The P0279 diagnostic trouble code (DTC) specifically pertains to a fault in the Cylinder 7 Injector Control Circuit on a 2014 GMC Sierra. This code indicates that the voltage in the control circuit for the fuel injector in cylinder 7 is lower than the specified range. The fuel injector control circuit is responsible for delivering the precise amount of fuel to the corresponding cylinder for combustion. When the voltage is too low, it can lead to issues with fuel delivery, resulting in poor engine performance, misfires, and potentially engine damage.

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

Common Causes of P0279 2014 GMC Sierra

  1. Faulty fuel injector in cylinder 7
  2. Wiring issues in the control circuit
  3. Poor connection in the circuit
  4. Malfunctioning engine control module (ECM)
  5. Corrosion or damage to electrical connectors

Symptoms of P0279 2014 GMC Sierra

  1. Rough idling or engine misfires
  2. Hesitation or stumbling during acceleration
  3. Reduced power output
  4. Engine stalling
  5. Increased fuel consumption

How to Fix P0279 2014 GMC Sierra

  1. Begin by conducting a visual inspection of the wiring harness and connectors related to the fuel injector in cylinder 7. Look for any signs of damage, corrosion, or loose connections.
  2. Use a multimeter to test the voltage in the control circuit to determine if it falls below the specified range. If the voltage is low, further diagnosis is required to pinpoint the exact cause.
  3. Test the fuel injector in cylinder 7 to check for proper operation. If the injector is faulty, it will need to be replaced.
  4. Inspect the engine control module (ECM) for any signs of damage or malfunction. If necessary, reprogram or replace the ECM to resolve the issue.
  5. Clear the DTC and perform a test drive to ensure that the repair has successfully addressed the low voltage issue in the Cylinder 7 Injector Control Circuit.

Cost to Fix P0279 2014 GMC Sierra

The typical repair costs for addressing a P0279 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty fuel injector can cost between $150 to $300, while repairing wiring issues or replacing the engine control module (ECM) can range from $200 to $500 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour, with additional charges for diagnostic time. It is advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on your location and vehicle's specific needs.

What does this mean?

Tech Notes for P0279 2014 GMC Sierra

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

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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 it’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?

You’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.

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