P0279 2017 GMC Sierra Code - Cylinder 7 Injector Control Circuit Low Voltage
Quick Answer
The diagnostic trouble code P0279 in a 2017 GMC Sierra specifically refers to an issue with the Cylinder 7 Injector Control Circuit experiencing low voltage. Common causes include Faulty fuel injector in cylinder 7, Damaged injector wiring harness, Issues with the powertrain control module (PCM). 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 2017 GMC Sierra indicates Cylinder 7 Injector Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty fuel injector in cylinder 7, Damaged injector wiring harness, Issues with the powertrain control module (PCM).
- 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 P0279 2017 GMC Sierra Description
The diagnostic trouble code P0279 in a 2017 GMC Sierra specifically refers to an issue with the Cylinder 7 Injector Control Circuit experiencing low voltage. This code is typically triggered when the powertrain control module (PCM) detects that the voltage in the control circuit for the fuel injector in cylinder 7 is lower than the specified range. This can lead to a variety of performance issues in the vehicle.
Common Causes of P0279 2017 GMC Sierra
- Faulty fuel injector in cylinder 7
- Damaged injector wiring harness
- Issues with the powertrain control module (PCM)
- Problems with the fuel delivery system
- Electrical issues such as a short circuit or open circuit in the control circuit
Symptoms of P0279 2017 GMC Sierra
- Rough idle
- Engine misfires
- Decreased engine performance
- Reduced fuel efficiency
- Potential stalling
How to Fix P0279 2017 GMC Sierra
- Begin by conducting a thorough inspection of the injector wiring harness and connections to identify any visible damage or loose connections.
- Test the fuel injector in cylinder 7 to determine if it is functioning correctly. If faulty, replace the injector.
- Check the powertrain control module (PCM) for any signs of damage or malfunction. If necessary, reprogram or replace the PCM.
- Inspect the fuel delivery system for any clogs, leaks, or issues that may be affecting fuel flow to cylinder 7.
- Clear the diagnostic trouble code from the PCM after completing the repairs and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0279 2017 GMC Sierra
The typical repair costs for addressing the Cylinder 7 Injector Control Circuit low voltage issue in a 2017 GMC Sierra can vary depending on the specific cause of the problem. Generally, the cost of replacing a fuel injector can range from $150 to $300 per injector, while repairing or replacing the PCM can cost between $500 and $1000. Labor costs for these repairs can range from $80 to $150 per hour. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific diagnosis and repair needs of the vehicle.
Tech Notes for P0279 2017 GMC Sierra
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Frequently Asked Questions about P0279 2017 GMC Sierra Code
What does code P0279 mean on a 2017 GMC Sierra?
Code P0279 indicates a "Cylinder 7 Injector Control Circuit Low Voltage," meaning there’s an electrical issue in the injector circuit for cylinder 7.
What are the common symptoms of code P0279?
Symptoms may include rough idling, engine misfire, reduced power, poor fuel efficiency, and an illuminated check engine light.
What causes code P0279 on a 2017 GMC Sierra?
Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a failed injector driver module, or a malfunctioning powertrain control module (PCM).
Can I drive my GMC Sierra with code P0279?
Driving with this code is not recommended, as it can lead to reduced performance, increased emissions, and potential damage to the engine over time.
How do I diagnose the P0279 code?
Start by inspecting the wiring and connectors for cylinder 7's injector, test the injector for proper operation, and check the voltage and ground signals with a multimeter.
How do I fix the P0279 code?
Repairs may include replacing a faulty injector, repairing damaged wiring or connectors, or replacing the injector driver module or PCM if necessary.
What tools are needed to troubleshoot code P0279?
You’ll need an OBDII scanner, a multimeter, and possibly a noid light or injector tester to diagnose and repair the issue.
How much does it cost to fix code P0279?
Repair costs vary but may range from $150 to $400 for injector replacement or wiring repairs. PCM replacement can cost significantly more.
Can a dirty fuel injector cause code P0279?
Yes, a clogged or dirty injector can sometimes cause insufficient fuel delivery, leading to low voltage in the injector circuit.
How do I prevent code P0279 from occurring again?
Regular maintenance, such as cleaning the fuel injectors and inspecting wiring connections for damage, can help prevent this issue in the future.
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