AutoCodes – GMC – P0261 GMC

P0261 GMC Code - Cylinder 1 Injector Control Circuit Low 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 1, Faulty Fuel Injector 1, Plugged Fuel Injector 1. 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: P0261 GMC indicates Cylinder 1 Injector Control Circuit Low Voltage.
Common causes: Common causes include Dirty Fuel Injector 1, Faulty Fuel Injector 1, Plugged Fuel Injector 1.
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 389

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 P0261 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 ground for greater than 2 s.

OBDII Code P0261 GMC - Cylinder 1 Injector Control Circuit Low Voltage - AutoCodes.com — P0261 GMC Code - Cylinder 1 Injector Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0261 GMC?

Dirty Fuel Injector 1
Faulty Fuel Injector 1
Plugged Fuel Injector 1
Fuel Injector #1 harness is open or shorted
Fuel Injector #1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0261 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 P0261 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 P0261 GMC code?

Need more information on how to fix the P0261 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0261 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0261 2014 GMC Sierra — Cylinder 1 Injector Control Circuit Low Voltage
P0261 2015 GMC Sierra — Cylinder 1 Injector Control Circuit Low Voltage
P0261 2016 GMC Sierra — Cylinder 1 Injector Control Circuit Low Voltage
P0261 2017 GMC Sierra — Cylinder 1 Injector Control Circuit Low Voltage
P0261 2018 GMC Sierra — Cylinder 1 Injector Control Circuit Low 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 P0261 GMC Code

1. What are the common symptoms of OBDII code P0261 on a GMC vehicle?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potentially stalling of the vehicle.

2. What are the possible causes of the Cylinder 1 Injector Control Circuit Low Voltage code (P0261) in a GMC?

- Possible causes include a faulty fuel injector, wiring issues in the injector circuit, a problem with the engine control module (ECM), or a poor electrical connection.

3. How can I diagnose the cause of OBDII code P0261 on my GMC vehicle?

- You can use a multimeter to check the voltage at the fuel injector, inspect the injector wiring for damage, and perform a continuity test on the circuit to pinpoint the issue.

4. Can a dirty or clogged fuel injector cause code P0261 to appear on a GMC vehicle?

- Yes, a dirty or clogged fuel injector can disrupt the fuel flow and lead to low voltage in the cylinder 1 injector circuit, triggering OBDII code P0261.

5. Is it safe to continue driving with OBDII code P0261 present on a GMC vehicle?

- It is not recommended to drive with this code present, as it can lead to further engine damage and potential safety hazards. It's best to address the issue promptly.

6. How can I repair OBDII code P0261 related to the Cylinder 1 Injector Control Circuit Low Voltage on my GMC?

- Repair options may include cleaning or replacing the fuel injector, repairing any damaged wiring, checking and resetting the ECM, or addressing any poor electrical connections.

7. Can a DIY enthusiast fix OBDII code P0261 on a GMC, or is professional help required?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to address this code by following proper diagnostic procedures and repair guidelines.

8. Are there any preventive maintenance tips to avoid encountering code P0261 on a GMC in the future?

- Regularly servicing the fuel system, using quality fuel, and keeping up with scheduled maintenance can help prevent issues like low voltage in the injector circuit that triggers this code.

9. Can extreme weather conditions or environmental factors contribute to the appearance of code P0261 on a GMC?

- Yes, extreme temperatures, moisture, or poor driving conditions can sometimes exacerbate existing issues with the fuel injector or electrical components, leading to code P0261.

10. Will resetting the OBDII system clear code P0261 on a GMC, or is further action needed?

- Resetting the system may temporarily clear the code, but if the underlying issue causing P0261 is not addressed, the code is likely to reappear. Identifying and fixing the root cause is crucial.