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Engine-Codes – GMC – P0277 2017 GMC Sierra

P0277 2017 GMC Sierra Code - Cylinder 6 Injector Control Circuit High Voltage

Quick Answer

The diagnostic trouble code P0277 for a 2017 GMC Sierra indicates an issue with the Cylinder 6 Injector Control Circuit having high voltage. Common causes include Faulty fuel injector for cylinder 6, Wiring issues in the injector control circuit, Malfunctioning Engine Control Module (ECM). 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 2017 GMC Sierra indicates Cylinder 6 Injector Control Circuit High Voltage.
Common causes
Common causes include Faulty fuel injector for cylinder 6, Wiring issues in the injector control circuit, Malfunctioning Engine Control Module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P0277 2017 GMC Sierra Description

The diagnostic trouble code P0277 for a 2017 GMC Sierra indicates an issue with the Cylinder 6 Injector Control Circuit having high voltage. This code is specifically related to the fuel injector for cylinder 6 in the engine. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time for optimal engine performance. When the control circuit for this injector has high voltage, it means that there is an electrical problem affecting the injector's operation.

OBDII Code P0277 2017 GMC Sierra - Cylinder 6 Injector Control Circuit High Voltage
P0277 2017 GMC Sierra Code - Cylinder 6 Injector Control Circuit High Voltage

Common Causes of P0277 2017 GMC Sierra

  1. Faulty fuel injector for cylinder 6
  2. Wiring issues in the injector control circuit
  3. Malfunctioning Engine Control Module (ECM)
  4. Poor electrical connection
  5. Corrosion or damage to the injector components

Symptoms of P0277 2017 GMC Sierra

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Difficulty starting the engine

How to Fix P0277 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harness and connections related to the injector control circuit.
  2. Test the fuel injector for cylinder 6 to determine if it is functioning correctly.
  3. Check the Engine Control Module (ECM) for any faults or errors that may be causing the high voltage issue.
  4. Replace the faulty fuel injector, repair any damaged wiring, or replace the ECM if necessary.
  5. Clear the diagnostic trouble codes from the vehicle's system and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0277 2017 GMC Sierra

The typical repair costs for addressing a Cylinder 6 Injector Control Circuit High Voltage issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, replacing a fuel injector can cost between $150 to $300 per injector, while diagnosing and repairing wiring issues or replacing the ECM can add to the overall cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, so the total cost can vary based on the time required for diagnosis and repair. It is advisable to consult with a qualified mechanic or auto repair shop to get a more accurate estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for P0277 2017 GMC Sierra

A clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0277 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P0277 in a 2017 GMC Sierra?

- Common symptoms include rough idling, engine misfires, loss of power, and possibly an illuminated check engine light.

2. What does the OBDII code P0277 on a 2017 GMC Sierra indicate?

- The code indicates a high voltage condition in the control circuit of the fuel injector for cylinder 6.

3. What are the possible causes of the Cylinder 6 Injector Control Circuit High Voltage code in a 2017 GMC Sierra?

- Possible causes include a faulty fuel injector, issues with the injector wiring harness, poor electrical connections, or a problem with the Engine Control Module (ECM).

4. How can I diagnose the cause of OBDII code P0277 in my 2017 GMC Sierra?

- Diagnose by inspecting the injector and wiring for damage, checking for proper voltage at the injector, and conducting continuity tests on the circuit.

5. Can a clogged fuel injector cause OBDII code P0277 on a 2017 GMC Sierra?

- Yes, a clogged or malfunctioning fuel injector for cylinder 6 can contribute to the high voltage condition triggering the P0277 code.

6. Is it safe to continue driving my 2017 GMC Sierra with OBDII code P0277?

- It is not recommended to drive the vehicle with this code as it can lead to engine performance issues and potential damage if left unaddressed.

7. How can I repair OBDII code P0277 on a 2017 GMC Sierra?

- Repair options include replacing the faulty fuel injector, repairing any damaged wiring, ensuring proper electrical connections, and resetting the ECM.

8. Can I clear the OBDII code P0277 on a 2017 GMC Sierra with a simple reset?

- While clearing the code may temporarily turn off the check engine light, it is crucial to address the underlying issue causing the code to prevent further problems.

9. Should I seek professional help to fix OBDII code P0277 on my 2017 GMC Sierra?

- If you are unsure about diagnosing or repairing the issue yourself, it is recommended to seek help from a qualified mechanic or dealership to ensure proper resolution.

10. How can I prevent OBDII code P0277 from recurring in my 2017 GMC Sierra?

- Regular maintenance, such as fuel system cleaning and using quality fuel, can help prevent issues with fuel injectors that may trigger the P0277 code.

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