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Engine-Codes – GMC – P0268 2018 GMC Sierra

P0268 2018 GMC Sierra Code - Cylinder 3 Injector Control Circuit High Voltage

Quick Answer

The P0268 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Cylinder 3 Injector Control Circuit High Voltage. Common causes include Faulty fuel injector in cylinder 3, Wiring or connector issues in the injector control circuit, ECM malfunction. 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 Faulty fuel injector in cylinder 3, Wiring or connector issues in the injector control circuit, ECM malfunction.
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 16, 2024
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Code P0268 2018 GMC Sierra Description

The P0268 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Cylinder 3 Injector Control Circuit High Voltage. This means that the Engine Control Module (ECM) has detected a higher than normal voltage in the control circuit for the fuel injector in cylinder 3. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time. When the voltage in the control circuit is too high, it can lead to a variety of performance issues and potentially cause long-term damage if not addressed promptly.

OBDII Code P0268 2018 GMC Sierra - Cylinder 3 Injector Control Circuit High Voltage
P0268 2018 GMC Sierra Code - Cylinder 3 Injector Control Circuit High Voltage

Common Causes of P0268 2018 GMC Sierra

  1. Faulty fuel injector in cylinder 3.
  2. Wiring or connector issues in the injector control circuit.
  3. ECM malfunction.
  4. Corrosion or poor connection in the circuit.
  5. Short circuit or open circuit in the wiring.

Symptoms of P0268 2018 GMC Sierra

  1. Rough idling or engine misfires.
  2. Decreased fuel efficiency.
  3. Engine hesitation or stumbling during acceleration.
  4. Check Engine Light illuminated.
  5. Engine stalling or difficulty starting.

How to Fix P0268 2018 GMC Sierra

  1. Begin by conducting a visual inspection of the wiring and connectors in the injector control circuit to check for any visible damage, corrosion, or loose connections.
  2. Use a multimeter to test the voltage in the circuit and compare it to the manufacturer's specifications to determine if it is indeed too high.
  3. Test the fuel injector in cylinder 3 to ensure it is functioning properly. If necessary, replace the injector.
  4. If the issue persists, check the ECM for any faults or errors and consider reprogramming or replacing it if needed.
  5. Clear the DTC from the ECM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0268 2018 GMC Sierra

The cost of repairing a Cylinder 3 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, the cost of replacing a fuel injector can range from $150 to $300, while the cost of diagnosing and repairing wiring or connector issues may add additional labor costs. Overall, the total repair cost for this issue could range from $200 to $500 or more, including parts and labor. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle.

What does this mean?

Tech Notes for P0268 2018 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 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.

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