AutoCodes – GMC – P0277 2017 GMC Sierra

P0277 2017 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 2017 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.

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Code Popularity 153

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0277 2017 GMC Sierra Description

The Engine Control Module (ECM) supplies voltage to each Fuel Injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector control circuit is shorted to voltage for greater than 2 s.

OBDII Code P0277 2017 GMC Sierra - Cylinder 6 Injector Control Circuit High Voltage - AutoCodes.com — P0277 2017 GMC Sierra Code - Cylinder 6 Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0277 2017 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 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.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0277 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.

Need more information about the P0277 2017 GMC Sierra code?

Need more information on how to fix the P0277 2017 GMC Sierra code? Get Access to Factory Service Manuals

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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.