P0279 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P0279 GMC?
- 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 GMC?
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 GMC 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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Information for Specific GMC Models
- P0279 2014 GMC Sierra — Cylinder 7 Injector Control Circuit Low Voltage
- P0279 2015 GMC Sierra — Cylinder 7 Injector Control Circuit Low Voltage
- P0279 2016 GMC Sierra — Cylinder 7 Injector Control Circuit Low Voltage
- P0279 2017 GMC Sierra — Cylinder 7 Injector Control Circuit Low Voltage
- P0279 2018 GMC Sierra — Cylinder 7 Injector Control Circuit Low Voltage
Frequently Asked Questions about P0279 GMC Code
1. What does the OBDII code P0279 mean on a GMC?
P0279 indicates a low voltage issue in the Cylinder 7 Injector Control Circuit, which can affect the engine's fuel injection system.
2. What are the common symptoms of code P0279 on a GMC?
Symptoms include rough idling, misfires, poor acceleration, reduced fuel efficiency, and in some cases, the engine may fail to start.
3. What causes the P0279 code to appear on a GMC vehicle?
Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a failing powertrain control module (PCM), or a blown fuse.
4. Can I drive my GMC with a P0279 code?
It is not recommended to drive with this code as it can lead to poor engine performance and potentially cause further damage to the engine or catalytic converter.
5. How do I troubleshoot the P0279 code on my GMC?
Start by inspecting the wiring and connectors for Cylinder 7's injector for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit.
6. How do I fix the P0279 code on a GMC?
Repairs may include replacing the faulty injector, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.
7. Can a clogged fuel injector cause the P0279 code?
While a clogged injector typically causes performance issues, this code specifically points to an electrical issue. However, it's still worth inspecting the injector for clogs as part of the diagnostic process.
8. How much does it cost to repair a P0279 code on a GMC?
Costs vary depending on the issue. Replacing a fuel injector may cost $200–$400, while repairing wiring could be less expensive. PCM replacement can exceed $500.
9. Can a bad PCM cause the P0279 code?
Yes, a malfunctioning PCM can fail to properly control the injector circuit, leading to this code.
10. Is a scanner required to diagnose the P0279 code on a GMC?
Yes, an OBDII scanner is necessary to read the code and monitor live data to pinpoint the issue in the injector circuit.
Discuss the causes and fixes for P0279 GMC OBDII Code
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