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Engine-Codes – GMC – P0268 2016 GMC Sierra

P0268 2016 GMC Sierra Code - Cylinder 3 Injector Control Circuit High Voltage

Quick Answer

The P0268 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the Cylinder 3 Injector Control Circuit High Voltage. Common causes include Faulty wiring or connectors in the injector control circuit, Defective fuel injector for cylinder 3, Issues with the 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
P0268 2016 GMC Sierra indicates Cylinder 3 Injector Control Circuit High Voltage.
Common causes
Common causes include Faulty wiring or connectors in the injector control circuit, Defective fuel injector for cylinder 3, Issues with the 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 17, 2024
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Code P0268 2016 GMC Sierra Description

The P0268 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the Cylinder 3 Injector Control Circuit High Voltage. This code is specifically related to the fuel injector for cylinder 3 in the engine. The fuel injector is responsible for delivering the correct amount of fuel into the combustion chamber at the precise moment for optimal engine performance. When the control circuit for the fuel injector in cylinder 3 is experiencing high voltage, it means that there is an electrical malfunction that is causing the injector to receive too much voltage. This can lead to a variety of performance issues and potential long-term effects if not addressed promptly.

OBDII Code P0268 2016 GMC Sierra - Cylinder 3 Injector Control Circuit High Voltage
P0268 2016 GMC Sierra Code - Cylinder 3 Injector Control Circuit High Voltage

Common Causes of P0268 2016 GMC Sierra

  1. Faulty wiring or connectors in the injector control circuit
  2. Defective fuel injector for cylinder 3
  3. Issues with the engine control module (ECM)
  4. Fuel system problems, such as a clogged fuel filter or fuel pump malfunction
  5. Corrosion or damage to the injector control circuit components

Symptoms of P0268 2016 GMC Sierra

  1. Rough idling or engine misfires
  2. Decreased fuel efficiency
  3. Engine hesitation or stalling
  4. Check Engine Light illuminated
  5. Strong fuel smell from the exhaust

How to Fix P0268 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring and connectors in the injector control circuit to check for any damage or loose connections.
  2. Test the fuel injector for cylinder 3 to determine if it is functioning properly. If the injector is faulty, it will need to be replaced.
  3. Check the engine control module (ECM) for any signs of damage or malfunction. If necessary, reprogram or replace the ECM.
  4. Inspect the fuel system components, such as the fuel filter and fuel pump, to ensure they are functioning correctly.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0268 2016 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 labor rates in your area. In general, you can expect to pay anywhere from $150 to $500 for parts and labor. Keep in mind that rates at auto repair shops can vary, with hourly labor rates typically ranging from $80 to $150. It's recommended to get a few quotes from different shops to ensure you are getting a fair price for the repair.

What does this mean?

Tech Notes for P0268 2016 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 2016 GMC Sierra Code

1. What does code P0268 mean on a 2016 GMC Sierra?

Code P0268 indicates that the powertrain control module (PCM) has detected a high voltage condition in the Cylinder 3 Injector Control Circuit.

2. What are the common symptoms of code P0268 in a 2016 GMC Sierra?

Symptoms may include rough idling, misfires, reduced engine performance, poor fuel economy, and the check engine light being illuminated.

3. What causes the P0268 code in a 2016 GMC Sierra?

Common causes include a shorted or damaged fuel injector, wiring issues such as frayed or corroded wires, a faulty PCM, or a malfunctioning injector driver circuit.

4. Can I drive my 2016 GMC Sierra with a P0268 code?

Driving with a P0268 code is not recommended, as it can cause poor engine performance, increased emissions, and potential damage to other engine components over time.

5. How do I diagnose the P0268 code in a 2016 GMC Sierra?

Diagnosis involves inspecting the injector wiring and connectors for damage, testing the fuel injector on Cylinder 3, checking the PCM for faults, and using a multimeter to measure voltage in the affected circuit.

6. How do I fix the P0268 code on my 2016 GMC Sierra?

Repairs may include replacing the Cylinder 3 fuel injector, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the PCM if necessary.

7. What tools are needed to troubleshoot a P0268 code on a 2016 GMC Sierra?

Common tools include a scan tool or OBDII scanner, a multimeter, and basic hand tools for inspecting and repairing wiring or connectors.

8. Can a bad fuel injector cause the P0268 code?

Yes, a shorted or internally damaged fuel injector in Cylinder 3 can cause the high voltage condition that triggers the P0268 code.

9. How much does it cost to fix a P0268 code on a 2016 GMC Sierra?

Repair costs vary, but replacing a single fuel injector typically ranges from $200 to $500, while wiring or PCM repairs can add additional costs.

10. How can I prevent the P0268 code from recurring in my 2016 GMC Sierra?

Regular maintenance, including inspecting and cleaning injector wiring, using high-quality fuel, and addressing engine issues promptly, can help prevent this code from recurring.

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