AutoCodes – GMC – P0268 2018 GMC Sierra

P0268 2018 GMC Sierra Code - Cylinder 3 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 3, Faulty Fuel Injector 3, Plugged Fuel Injector 3. 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: P0268 2018 GMC Sierra indicates Cylinder 3 Injector Control Circuit High Voltage.
Common causes: Common causes include Dirty Fuel Injector 3, Faulty Fuel Injector 3, Plugged Fuel Injector 3.
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 200

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 P0268 2018 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 P0268 2018 GMC Sierra - Cylinder 3 Injector Control Circuit High Voltage - AutoCodes.com — P0268 2018 GMC Sierra Code - Cylinder 3 Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0268 2018 GMC Sierra?

Dirty Fuel Injector 3
Faulty Fuel Injector 3
Plugged Fuel Injector 3
Fuel Injector #3 harness is open or shorted
Fuel Injector #3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0268 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.

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 P0268 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.

Need more information about the P0268 2018 GMC Sierra code?

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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 P0268 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0268 in a 2018 GMC Sierra?

The common symptoms of OBDII code P0268, Cylinder 3 Injector Control Circuit High Voltage, in a 2018 GMC Sierra include rough idling, engine misfires, decreased fuel efficiency, and potentially, the illumination of the Check Engine light.

2. What are the possible causes of OBDII code P0268 in a 2018 GMC Sierra?

Possible causes of OBDII code P0268 in a 2018 GMC Sierra include a faulty fuel injector, issues with the fuel injector wiring or connector, a problem with the Engine Control Module (ECM), or a poor electrical connection.

3. How can I diagnose the OBDII code P0268 in my 2018 GMC Sierra?

Diagnosing OBDII code P0268 in a 2018 GMC Sierra involves using a diagnostic scanner to retrieve the trouble code, checking the cylinder 3 fuel injector for proper functioning, inspecting the wiring and connectors for any damage, and testing the ECM for faults.

4. Can I continue driving my 2018 GMC Sierra with OBDII code P0268?

While it may be possible to drive your 2018 GMC Sierra with OBDII code P0268, it is not recommended as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.

5. How can I repair OBDII code P0268 in my 2018 GMC Sierra?

Repairing OBDII code P0268 in a 2018 GMC Sierra involves checking and potentially replacing the cylinder 3 fuel injector, repairing any damaged wiring or connectors, resetting the ECM, and clearing the trouble code with a diagnostic scanner.

6. Are there any DIY tips for fixing OBDII code P0268 in a 2018 GMC Sierra?

While diagnosing and repairing OBDII code P0268 may require specialized tools and expertise, DIY enthusiasts can start by inspecting the fuel injector wiring and connectors for visible damage before seeking professional help.

7. How much does it cost to fix OBDII code P0268 in a 2018 GMC Sierra?

The cost of fixing OBDII code P0268 in a 2018 GMC Sierra can vary depending on the root cause of the issue, the extent of the repair needed, and labor costs. It is advisable to obtain quotes from reputable mechanics or dealerships.

8. Can a faulty fuel injector cause OBDII code P0268 in a 2018 GMC Sierra?

Yes, a faulty fuel injector in cylinder 3 can cause OBDII code P0268 in a 2018 GMC Sierra. It is essential to properly diagnose the issue to determine if the fuel injector needs replacement.

9. What happens if OBDII code P0268 in a 2018 GMC Sierra is left untreated?

If left untreated, OBDII code P0268 in a 2018 GMC Sierra can lead to persistent engine misfires, reduced fuel efficiency, potential damage to the catalytic converter, and ultimately, more expensive repairs.

10. Is it necessary to reset the ECM after fixing OBDII code P0268 in a 2018 GMC Sierra?

Yes, it is recommended to reset the ECM after fixing OBDII code P0268 in a 2018 GMC Sierra to clear the trouble code and ensure the system registers the repair. This can be done using a diagnostic scanner or by disconnecting the battery for a few minutes.