AutoCodes – GMC – P26C9 GMC

P26C9 GMC Code - Auxiliary Chassis Control Module Requested MIL Illumination

Quick Answer

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. Common causes include Check Auxiliary Chassis Control Module for codes, Faulty Auxiliary Chassis Control Module. 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: P26C9 GMC indicates Auxiliary Chassis Control Module Requested MIL Illumination.
Common causes: Common causes include Check Auxiliary Chassis Control Module for codes, Faulty Auxiliary Chassis Control Module.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 285

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 Jul 15, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P26C9 GMC Description

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. If a condition is detected, the module sets a Diagnostic Trouble Code (DTC) and sends a serial data message to the Engine Control Module (ECM). The ECM sets a DTC to inform that the module has set a DTC. The serial data message sent by the module also contains a request for the ECM to illuminate the Malfunction Indicator Lamp (MIL).
The DTC will be set when the ECM receives a serial data message from the Auxiliary Chassis Control Module indicating that DTC has been set in the module.

OBDII Code P26C9 GMC - Auxiliary Chassis Control Module Requested MIL Illumination - AutoCodes.com — P26C9 GMC Code - Auxiliary Chassis Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P26C9 GMC?

Check Auxiliary Chassis Control Module for codes
Faulty Auxiliary Chassis Control Module

How to Fix the DTC P26C9 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P26C9 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 P26C9 GMC code?

Need more information on how to fix the P26C9 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P26C9 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P26C9 2014 GMC Sierra — Auxiliary Chassis Control Module Requested MIL Illumination
P26C9 2015 GMC Sierra — Auxiliary Chassis Control Module Requested MIL Illumination
P26C9 2016 GMC Sierra — Auxiliary Chassis Control Module Requested MIL Illumination
P26C9 2017 GMC Sierra — Auxiliary Chassis Control Module Requested MIL Illumination
P26C9 2018 GMC Sierra — Auxiliary Chassis Control Module Requested MIL Illumination

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 P26C9 GMC Code

1. What are the common symptoms of OBDII code P26C9 in a GMC vehicle?

The common symptoms include the Check Engine Light (MIL) illuminating on the dashboard and potential issues with the chassis control system.

2. What does the OBDII code P26C9 in a GMC indicate?

The code P26C9 indicates that the Auxiliary Chassis Control Module has requested the MIL (Malfunction Indicator Lamp) illumination.

3. What are the possible causes of OBDII code P26C9 in a GMC?

Possible causes include wiring issues, a faulty chassis control module, a malfunctioning MIL circuit, or software-related problems.

4. How serious is OBDII code P26C9 in a GMC?

While this code may not affect the drivability of the vehicle, it should not be ignored as it indicates a potential issue with the chassis control system that may impact safety and emissions.

5. How can I diagnose OBDII code P26C9 in my GMC?

Diagnosis typically involves using an OBDII scanner to read the code, inspecting the chassis control module and related wiring, and performing any necessary software updates.

6. Can I continue driving my GMC with OBDII code P26C9 illuminated?

It is generally not recommended to ignore the MIL light, as it indicates a problem that should be addressed to prevent potential safety hazards or further damage to the vehicle.

7. How can I reset OBDII code P26C9 in my GMC?

After addressing the underlying issue causing the code, the code can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

8. Is it possible to repair OBDII code P26C9 in a GMC by myself?

Depending on your automotive repair skills and access to tools, you may be able to address this code yourself by checking the wiring, inspecting the control module, and performing basic troubleshooting.

9. Are there any known recalls or technical service bulletins related to OBDII code P26C9 in GMC vehicles?

It's advisable to check with a GMC dealership or the manufacturer's website for any recalls or technical service bulletins related to this specific OBDII code to see if there are any known issues or repair solutions available.

10. How much does it cost to repair OBDII code P26C9 in a GMC at a professional auto repair shop?

The cost of repairing this code can vary depending on the underlying issue, parts needed, labor costs, and the specific shop rates in your area. It's recommended to obtain quotes from different shops for an accurate estimate.