AutoCodes – GMC – P26C9 2017 GMC Sierra

P26C9 2017 GMC Sierra 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 2017 GMC Sierra 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.

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Code Popularity 151

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
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Code P26C9 2017 GMC Sierra 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 2017 GMC Sierra - Auxiliary Chassis Control Module Requested MIL Illumination - AutoCodes.com — P26C9 2017 GMC Sierra Code - Auxiliary Chassis Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P26C9 2017 GMC Sierra?

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

How to Fix the DTC P26C9 2017 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P26C9 2017 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 P26C9 2017 GMC Sierra code?

Need more information on how to fix the P26C9 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P26C9 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

1. What does the OBDII code P26C9 mean for a 2017 GMC Sierra?

The code P26C9 indicates that the Auxiliary Chassis Control Module has requested the malfunction indicator light (MIL) to illuminate due to a detected issue.

2. What are the common symptoms of P26C9 in a 2017 GMC Sierra?

Symptoms include the MIL or check engine light illuminating, potential loss of auxiliary chassis functions, or no noticeable symptoms in some cases.

3. What causes the P26C9 code to appear on a 2017 GMC Sierra?

This code can be caused by a faulty Auxiliary Chassis Control Module, wiring or connectivity issues, or software-related problems in the vehicle's control systems.

4. Is it safe to drive with the P26C9 code on a 2017 GMC Sierra?

In many cases, the vehicle can still be driven, but itâ€™s important to have the issue diagnosed and repaired promptly to avoid potential complications.

5. How can I diagnose the P26C9 code on my 2017 GMC Sierra?

Diagnosis involves scanning the vehicle with an OBDII scanner, checking for related codes, inspecting wiring and connectors, and testing the Auxiliary Chassis Control Module.

6. How do I fix the P26C9 code on a 2017 GMC Sierra?

Repairs may include replacing the Auxiliary Chassis Control Module, repairing damaged wiring, or updating software in the control module.

7. Can a software update resolve the P26C9 code on my 2017 GMC Sierra?

Yes, a software update may resolve the issue if the code is caused by a programming glitch in the Auxiliary Chassis Control Module.

8. How much does it cost to repair the P26C9 code on a 2017 GMC Sierra?

Repair costs can vary depending on the exact issue, but replacing the Auxiliary Chassis Control Module typically ranges from $300 to $800, including parts and labor.

9. Can I clear the P26C9 code without fixing the problem?

Clearing the code without addressing the root cause may turn off the MIL temporarily, but the code is likely to return if the underlying issue isnâ€™t fixed.

10. Does the P26C9 code require professional repair, or can I fix it myself?

While some basic checks like inspecting wiring can be done by DIYers, diagnosing and repairing the Auxiliary Chassis Control Module often requires specialized tools and expertise, so professional help is recommended.