AutoCodes – GMC – C0240 GMC

C0240 GMC Code - Powertrain Control Module Traction Control Not Allowed

Quick Answer

The Powertrain Control Module (PCM) and the Electronic Brake Control Module (EBCM) communicate on the serial data link, whenever the ignition is ON. Common causes include Faulty Throttle Actuator, Throttle Actuator harness is open or shorted, Throttle Actuator 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: C0240 GMC indicates Powertrain Control Module Traction Control Not Allowed.
Common causes: Common causes include Faulty Throttle Actuator, Throttle Actuator harness is open or shorted, Throttle Actuator 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 12,920

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 Jun 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0240 GMC Description

The Powertrain Control Module (PCM) and the Electronic Brake Control Module (EBCM) communicate on the serial data link, whenever the ignition is ON. The EBCM receives a serial data message stating that the PCM has lost the ability to reduce engine torque. A requested torque signal malfunction is only one possible cause for the PCM to lose the ability to perform traction control. DTC C0240 may set due to engine overheating, throttle actuator control failure, loss of ignition timing control by the PCM, etc.

OBDII Code C0240 GMC - Powertrain Control Module Traction Control Not Allowed - AutoCodes.com — C0240 GMC Code - Powertrain Control Module Traction Control Not Allowed

What does this mean?

What are the Possible Causes of the DTC C0240 GMC?

Faulty Throttle Actuator
Throttle Actuator harness is open or shorted
Throttle Actuator circuit poor electrical connection
Engine overheating

How to Fix the DTC C0240 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 C0240 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 C0240 GMC 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 C0240 GMC Code

1. What are the common symptoms of OBDII code C0240 in a GMC vehicle?

- Common symptoms include the traction control system being disabled, the traction control warning light illuminating on the dashboard, and potential loss of traction control functionality.

2. What does the OBDII code C0240 in a GMC vehicle indicate?

- This code signifies a malfunction in the Powertrain Control Module (PCM) that is preventing the traction control system from operating correctly.

3. What are the possible causes of OBDII code C0240 in a GMC vehicle?

- Potential causes include a faulty PCM, damaged wiring or connectors in the traction control system, a failed wheel speed sensor, or issues with the ABS system.

4. How can I diagnose the OBDII code C0240 in my GMC vehicle?

- Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, inspecting the traction control system components for damage, and conducting electrical tests to pinpoint the issue.

5. Can I continue driving my GMC vehicle with the OBDII code C0240 present?

- It is not recommended to continue driving with this code present, as it indicates a fault in the traction control system that could compromise vehicle safety and performance.

6. How can I repair OBDII code C0240 in my GMC vehicle?

- Repair options may include replacing the PCM, repairing or replacing damaged wiring or connectors, fixing the wheel speed sensor, or addressing any underlying ABS system issues.

7. Is it possible to reset the OBDII code C0240 in a GMC vehicle without fixing the underlying issue?

- While you can clear the code with a diagnostic scanner, it will likely reappear until the root cause of the problem is addressed.

8. Are there any DIY tips for troubleshooting OBDII code C0240 in a GMC vehicle?

- DIY troubleshooting tips include checking for loose or damaged wiring, inspecting the wheel speed sensors for debris or damage, and ensuring all connectors are securely attached.

9. How much does it typically cost to repair OBDII code C0240 in a GMC vehicle?

- Repair costs can vary depending on the specific issue causing the code, but expenses may include parts replacement, labor costs, and diagnostic fees.

10. Can a professional mechanic help me resolve OBDII code C0240 in my GMC vehicle?

- Yes, a qualified mechanic with experience in diagnosing and repairing traction control system issues can help identify the cause of the code and perform the necessary repairs to resolve it.