AutoCodes – GMC – P0268 2016 GMC Sierra

P0268 2016 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 2016 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 207

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 2016 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 2016 GMC Sierra - Cylinder 3 Injector Control Circuit High Voltage - AutoCodes.com — P0268 2016 GMC Sierra Code - Cylinder 3 Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0268 2016 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 2016 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 2016 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 2016 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 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.