AutoCodes – GMC – P0268 2015 GMC Sierra

P0268 2015 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 2015 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 174

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 2015 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 2015 GMC Sierra - Cylinder 3 Injector Control Circuit High Voltage - AutoCodes.com — P0268 2015 GMC Sierra Code - Cylinder 3 Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0268 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

What does the OBDII code P0268 mean on a 2015 GMC Sierra?

P0268 indicates that the powertrain control module (PCM) has detected high voltage in the cylinder 3 injector control circuit.

What are the common symptoms of code P0268 in a 2015 GMC Sierra?

Symptoms may include rough idling, decreased fuel efficiency, loss of engine power, difficulty starting, or an illuminated check engine light.

What causes the P0268 code to appear?

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a failing PCM, or excessive resistance in the circuit.

Can I still drive my 2015 GMC Sierra with a P0268 code?

Itâ€™s possible to drive short distances, but doing so could cause further damage to the engine or catalytic converter. Prompt diagnosis and repair are recommended.

How do I diagnose the P0268 code on a 2015 GMC Sierra?

Start by inspecting the wiring and connectors for cylinder 3â€™s injector. Use a multimeter to test for proper voltage and resistance. If the wiring is intact, test or replace the injector itself.

What tools do I need to troubleshoot the P0268 code?

A multimeter, OBDII scanner, wiring diagram, and possibly an injector test light or noid light are helpful for diagnosing this issue.

How much does it cost to fix the P0268 code?

Repair costs can range from $50 for minor wiring repairs to $300-$700 for replacing a fuel injector. PCM replacement may cost more.

Can a bad PCM cause the P0268 code?

Yes, a malfunctioning PCM can send incorrect signals to the injector, leading to high voltage in the circuit.

How can I prevent the P0268 code from returning?

Regular maintenance, such as inspecting and replacing damaged wiring and ensuring injectors are clean, can help prevent this code.

Do I need to replace all fuel injectors if I get a P0268 code?

No, only the injector for cylinder 3 needs to be replaced if itâ€™s determined to be faulty. However, itâ€™s good practice to inspect the others for wear.