P0277 2018 GMC Sierra Code - Cylinder 6 Injector Control Circuit High 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 6, Faulty Fuel Injector 6, Plugged Fuel Injector 6. 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
- P0277 2018 GMC Sierra indicates Cylinder 6 Injector Control Circuit High Voltage.
- Common causes
- Common causes include Dirty Fuel Injector 6, Faulty Fuel Injector 6, Plugged Fuel Injector 6.
- 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 P0277 2018 GMC Sierra Description
What are the Possible Causes of the DTC P0277 2018 GMC Sierra?
- Dirty Fuel Injector 6
- Faulty Fuel Injector 6
- Plugged Fuel Injector 6
- Fuel injector 6 harness is open or shorted
- Fuel injector 6 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0277 2018 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 P0277 2018 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 P0277 2018 GMC Sierra Code
What does the OBDII code P0277 mean on a 2018 GMC Sierra?
Code P0277 indicates that the Engine Control Module (ECM) has detected high voltage in the Cylinder 6 Injector Control Circuit.
What are the symptoms of code P0277 in a 2018 GMC Sierra?
Common symptoms include rough idling, reduced engine performance, misfires, poor fuel economy, and possible illumination of the check engine light.
What causes the P0277 code to appear?
Possible causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning ECM, or corrosion in the circuit.
Can I drive my 2018 GMC Sierra with the P0277 code?
Driving with this code is not recommended, as it can lead to engine performance issues and potential damage to the engine or catalytic converter.
How do I diagnose the P0277 code on a 2018 GMC Sierra?
Diagnosis involves inspecting the wiring and connectors for damage or corrosion, testing the injector for proper function, and checking the ECM for faults.
How can I fix the P0277 code on my 2018 GMC Sierra?
Repairs may include replacing the faulty injector, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.
How much does it cost to fix the P0277 code on a GMC Sierra?
Repair costs vary, but replacing a fuel injector typically costs $200–$400, while addressing wiring or ECM issues can increase the cost.
Can a dirty fuel injector cause the P0277 code?
A dirty injector is less likely to cause this specific code since it relates to high voltage, but a malfunctioning injector can still contribute to the issue.
How can I prevent the P0277 code from recurring?
Regular maintenance, such as inspecting wiring and keeping the fuel system clean, can help prevent injector circuit issues and related codes.
Will clearing the P0277 code with a scanner fix the problem?
Clearing the code will remove it temporarily, but the underlying issue must be repaired to prevent the code and symptoms from returning.
Discuss the causes and fixes for P0277 2018 GMC Sierra OBDII Code
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