P0279 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC P0279 2015 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 2015 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 2015 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 2015 GMC Sierra Code
1. What does OBDII code P0279 mean for a 2015 GMC Sierra?
Code P0279 indicates a low voltage issue in the Cylinder 7 injector control circuit, meaning the injector isn't receiving the proper electrical signal.
2. What are common symptoms of code P0279 in a GMC Sierra?
Symptoms include rough engine idle, misfires, reduced fuel efficiency, poor acceleration, and the check engine light illuminating.
3. What causes the P0279 code on a 2015 GMC Sierra?
Possible causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a bad PCM, or corrosion in the electrical connections.
4. Can I drive my 2015 GMC Sierra with code P0279 active?
Driving with this code is not recommended, as it can lead to engine performance issues, increased emissions, and potential damage to other components.
5. How do I diagnose the P0279 code on my GMC Sierra?
Start by inspecting the wiring and connectors for Cylinder 7's injector, testing the injector itself, and checking the voltage and continuity in the circuit.
6. How can I fix code P0279 on my 2015 GMC Sierra?
Repairs may include replacing the Cylinder 7 fuel injector, repairing damaged wiring or connectors, or replacing the PCM if necessary.
7. How much does it cost to fix code P0279 in a 2015 GMC Sierra?
Repair costs vary, but replacing a fuel injector typically costs $200-$500, while wiring repairs or PCM replacement may cost more depending on labor rates.
8. Will clearing the code fix the P0279 issue permanently?
Clearing the code may temporarily turn off the check engine light, but if the underlying issue isn’t addressed, the code will return.
9. Can a bad PCM cause the P0279 code on a GMC Sierra?
Yes, a malfunctioning PCM can fail to send proper signals to the injector, triggering the P0279 code.
10. Should I test the fuel injector if I get a P0279 code?
Yes, testing the fuel injector for proper operation is essential, as a faulty injector is a common cause of this code.
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