AutoCodes – GMC – C0242 2018 GMC Sierra

C0242 2018 GMC Sierra Code - Engine Control Module Indicated Traction Control Malfunction

Quick Answer

The Electronic Brake Control Module (EBCM) and the Engine Control Module (ECM) simultaneously control the traction control. Common causes include Faulty Electronic Brake Control Module (EBCM), EBCM Harness is open or shorted, EBCM Circuit poor electrical connection. 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: C0242 2018 GMC Sierra indicates Engine Control Module Indicated Traction Control Malfunction.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), EBCM Harness is open or shorted, EBCM Circuit poor electrical connection.
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 264

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 28, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0242 2018 GMC Sierra Description

The Electronic Brake Control Module (EBCM) and the Engine Control Module (ECM) simultaneously control the traction control. The Electronic Brake Control Module sends a serial data message to the Engine Control Module requesting torque reduction. When certain Engine Control Module DTCs are set, the Engine Control Module will not be able to perform the torque reduction for traction control. A serial data message is sent to the Electronic Brake Control Module indicating that traction control is not allowed. The Diagnostic Trouble Code (DTC) engine control module detects a fault that prevents it from performing a traction control function and sends a serial data message to the electronic brake control module indicating that torque reduction is not allowed.

OBDII Code C0242 2018 GMC Sierra - Engine Control Module Indicated Traction Control Malfunction - AutoCodes.com — C0242 2018 GMC Sierra Code - Engine Control Module Indicated Traction Control Malfunction

What does this mean?

What are the Possible Causes of the DTC C0242 2018 GMC Sierra?

Faulty Electronic Brake Control Module (EBCM)
EBCM Harness is open or shorted
EBCM Circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC C0242 2018 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 C0242 2018 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 C0242 2018 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 C0242 2018 GMC Sierra Code

What does the OBDII code C0242 mean on a 2018 GMC Sierra?

The code C0242 indicates that the Engine Control Module (ECM) has detected a malfunction in the traction control system.

What are the common symptoms of code C0242 in a 2018 GMC Sierra?

Common symptoms include the Traction Control System (TCS) or Stabilitrak warning light illuminating, reduced traction control functionality, and potential loss of stability assistance.

What causes the C0242 code to appear on a 2018 GMC Sierra?

Common causes include faulty wheel speed sensors, wiring issues, a malfunctioning ECM or ABS module, or communication errors between the ECM and other control modules.

Can a bad ECM cause the C0242 code on my 2018 GMC Sierra?

Yes, a malfunctioning ECM can trigger this code if it fails to properly communicate with the traction control system.

How do I diagnose the C0242 code on a 2018 GMC Sierra?

Diagnosis typically involves scanning for related codes, inspecting the wheel speed sensors and wiring, and checking the ECM and ABS module for proper functionality.

Is the C0242 code serious on a 2018 GMC Sierra?

Yes, while the truck may still be drivable, the loss of traction control can increase the risk of skidding or losing control in slippery conditions.

Can I clear the C0242 code without fixing the issue on a 2018 GMC Sierra?

Clearing the code without addressing the root problem will likely result in the code returning, as the underlying issue remains unresolved.

How much does it cost to fix the C0242 code on a 2018 GMC Sierra?

Repair costs can vary widely depending on the cause, ranging from $100 for sensor replacements to over $1,000 for module repairs or replacements.

Can a weak battery cause the C0242 code on a 2018 GMC Sierra?

Yes, a weak or failing battery can cause communication errors between modules, potentially triggering the C0242 code.

Do I need a professional mechanic to fix the C0242 code on my 2018 GMC Sierra?

Depending on your skill level, you may be able to address simple issues like replacing a sensor, but more complex problems, like module reprogramming, typically require a professional.