AutoCodes – Chevrolet – U240D Chevrolet

U240D Chevrolet Code - Transmission Range Selector Control Module Powertrain Expansion CAN Bus Off

Quick Answer

The powertrain high-speed General Motors Local Area Network (GMLAN)serial data circuits are serial data buses used to communicate information between the devices. Common causes include Faulty Transmission Range Selector Control Module, Transmission Range Selector Control Module harness is open or shorted, Transmission Range Selector Control Module 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: U240D Chevrolet indicates Transmission Range Selector Control Module Powertrain Expansion CAN Bus Off.
Common causes: Common causes include Faulty Transmission Range Selector Control Module, Transmission Range Selector Control Module harness is open or shorted, Transmission Range Selector Control Module 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.

Save to My Repairs My Repairs

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

Code Popularity 671

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 17, 2020

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 U240D Chevrolet Description

The powertrain high-speed General Motors Local Area Network (GMLAN)serial data circuits are serial data buses used to communicate information between the devices. The powertrain high speed GMLAN serial data circuits also connect directly to the X84 Data Link Connector (DLC) for programming purposes. If this serial data system is inoperative, the devices will still communicate with the scan tool due to other serial data systems but not with each other. The device setting the Diagnostic Trouble Code (DTC) has attempted to establish communications on the powertrain high-speed GMLAN serial data circuits more than 3 times.

OBDII Code U240D Chevrolet - Transmission Range Selector Control Module Powertrain Expansion CAN Bus Off - AutoCodes.com — U240D Chevrolet Code - Transmission Range Selector Control Module Powertrain Expansion CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U240D Chevrolet?

Faulty Transmission Range Selector Control Module
Transmission Range Selector Control Module harness is open or shorted
Transmission Range Selector Control Module circuit poor electrical connection

How to Fix the DTC U240D Chevrolet?

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 U240D Chevrolet 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 U240D Chevrolet code?

Need more information on how to fix the U240D Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U240D Chevrolet 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 U240D Chevrolet Code

1. What does OBDII code U240D mean on a Chevrolet?

U240D indicates a communication issue with the Transmission Range Selector Control Module due to the Powertrain Expansion CAN bus being off or disrupted.

2. What are common symptoms of code U240D on a Chevrolet?

Symptoms may include erratic shifting, the transmission stuck in a single gear, a check engine light, or reduced vehicle performance.

3. What causes the U240D code to appear?

Common causes include damaged wiring, faulty connectors, malfunctioning Transmission Range Selector Control Module, or issues with the CAN bus network.

4. Can I drive my Chevrolet with a U240D code?

Itâ€™s not recommended, as the transmission may not operate correctly and could lead to further damage or unsafe driving conditions.

5. How do I diagnose a U240D code on my Chevrolet?

Start by inspecting the wiring and connectors for damage, then check the CAN bus network for continuity and communication issues using a diagnostic scanner.

6. How much does it cost to fix a U240D code on a Chevrolet?

Repair costs vary depending on the issue, ranging from $50 for basic wiring repairs to $500 or more for module replacement.

7. Can a weak battery cause the U240D code?

Yes, a weak or failing battery can disrupt the CAN bus network and trigger a U240D code.

8. What tools are needed to troubleshoot a U240D code?

Youâ€™ll need a diagnostic scanner capable of reading CAN bus data, a multimeter for checking wiring, and possibly a service manual for your vehicle.

9. Does the U240D code require module replacement?

Not always. The issue could be as simple as a loose connector or damaged wiring, but module replacement may be needed if itâ€™s faulty.

10. Can clearing the code fix the U240D problem?

Clearing the code without addressing the root cause will only temporarily hide the issue, and itâ€™s likely to return. Proper diagnosis and repair are necessary.