P0279 2017 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 2017 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.
Code P0279 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0279 2017 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 2017 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0279 2017 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.
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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.
Discuss the causes and fixes for P0279 2017 GMC Sierra OBDII Code
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