AutoCodes – GMC – P0265 GMC

P0265 GMC Code - Cylinder 2 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 2, Faulty Fuel Injector 2, Plugged Fuel Injector 2. 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: P0265 GMC indicates Cylinder 2 Injector Control Circuit High Voltage.
Common causes: Common causes include Dirty Fuel Injector 2, Faulty Fuel Injector 2, Plugged Fuel Injector 2.
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 336

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 P0265 GMC 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 P0265 GMC - Cylinder 2 Injector Control Circuit High Voltage - AutoCodes.com — P0265 GMC Code - Cylinder 2 Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0265 GMC?

Dirty Fuel Injector 2
Faulty Fuel Injector 2
Plugged Fuel Injector 2
Fuel Injector #2 harness is open or shorted
Fuel Injector #2 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0265 GMC?

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 P0265 GMC 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 P0265 GMC code?

Need more information on how to fix the P0265 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0265 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0265 2014 GMC Sierra — Cylinder 2 Injector Control Circuit High Voltage
P0265 2015 GMC Sierra — Cylinder 2 Injector Control Circuit High Voltage
P0265 2016 GMC Sierra — Cylinder 2 Injector Control Circuit High Voltage
P0265 2017 GMC Sierra — Cylinder 2 Injector Control Circuit High Voltage
P0265 2018 GMC Sierra — Cylinder 2 Injector Control Circuit High Voltage

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 P0265 GMC Code

What does the OBDII code P0265 mean for a GMC vehicle?

P0265 indicates a high voltage issue in the cylinder 2 injector control circuit, suggesting an electrical issue affecting fuel delivery to that cylinder.

What are common symptoms of the P0265 code on a GMC?

Symptoms may include rough idling, decreased fuel efficiency, engine misfires, hesitation during acceleration, and possibly the check engine light turning on.

What causes the P0265 code to appear on a GMC?

Common causes include a faulty fuel injector, wiring issues such as shorts or open circuits, a damaged injector driver in the PCM, or corrosion in the electrical connectors.

Can a dirty fuel injector cause the P0265 code in a GMC?

No, the P0265 code is related to an electrical issue in the control circuit, not mechanical problems like dirt or clogging.

How do you diagnose the P0265 code in a GMC?

Mechanics diagnose this code by inspecting the injector wiring and connectors, testing the fuel injector for proper electrical resistance, and checking the PCM for driver circuit faults.

Is it safe to drive a GMC with the P0265 code?

Driving with this code may lead to engine performance issues, increased fuel consumption, and potential engine damage, so it is best to address the issue promptly.

What repairs are typically needed to fix the P0265 code on a GMC?

Repairs may include replacing the cylinder 2 fuel injector, repairing or replacing damaged wiring or connectors, or, in rare cases, replacing the PCM.

How much does it cost to fix the P0265 code on a GMC?

Repair costs vary depending on the specific issue, but replacing a fuel injector typically costs $150-$300, while wiring repairs may range from $50-$200.

Can a bad PCM cause the P0265 code in a GMC?

Yes, a malfunctioning PCM can cause this code if the injector driver circuit fails to operate properly.

How can I prevent the P0265 code from occurring in my GMC?

Regularly inspect and maintain your vehicleâ€™s wiring and fuel system components to prevent electrical issues and ensure fuel injectors are functioning properly.