AutoCodes – Generic – U2409

U2409 Code - Transmission Range Control Module High Speed CAN Bus Off

Quick Answer

The 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 Control Module, Transmission Range Control Module harness is open or shorted, Transmission Range 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: U2409 indicates Transmission Range Control Module High Speed CAN Bus Off.
Common causes: Common causes include Faulty Transmission Range Control Module, Transmission Range Control Module harness is open or shorted, Transmission Range 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.

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Code Popularity 591

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
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Code U2409 Description

The high-speed General Motors Local Area Network (GMLAN) serial data circuits are serial data buses used to communicate information between the devices. The 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, some devices may still be able to 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 high-speed GMLAN serial data circuits more than 3 times.

OBDII Code U2409 - Transmission Range Control Module High Speed CAN Bus Off - AutoCodes.com — U2409 Code - Transmission Range Control Module High Speed CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U2409?

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

How to Fix the DTC U2409?

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 U2409 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 U2409 code?

Need more information on how to fix the U2409 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2409 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2409 Buick — Transmission Range Control Module High Speed CAN Bus Off
U2409 Cadillac — Transmission Range Control Module High Speed CAN Bus Off
U2409 Chevrolet — Transmission Range Control Module High Speed CAN Bus Off
U2409 GMC — Transmission Range Control Module High Speed CAN Bus Off

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 U2409 Code

1. What are the common symptoms of OBDII code U2409?

- Common symptoms include issues with shifting gears, erratic transmission behavior, and illumination of the transmission warning light on the dashboard.

2. What does the OBDII code U2409 indicate?

- The U2409 code indicates a problem with the Transmission Range Control Module High Speed CAN Bus being off or not functioning properly.

3. What are the possible causes of the U2409 code?

- Possible causes include a faulty Transmission Range Control Module, damaged wiring or connectors in the CAN bus system, or a communication error within the transmission control system.

4. How can I diagnose the U2409 code?

- Diagnosing the U2409 code typically involves using a diagnostic scanner to retrieve the code, checking the transmission range control module for any signs of damage, and inspecting the CAN bus wiring for any issues.

5. Can I still drive my vehicle with the U2409 code present?

- It is not recommended to drive your vehicle with the U2409 code present, as it can lead to further damage to the transmission system and potentially unsafe driving conditions.

6. How can I repair the U2409 code?

- Repairing the U2409 code may involve replacing the faulty Transmission Range Control Module, repairing any damaged wiring or connectors in the CAN bus system, and clearing the code with a diagnostic scanner.

7. Is it possible to reset the U2409 code without fixing the underlying issue?

- While you can clear the U2409 code using a diagnostic scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Will the U2409 code cause my vehicle to fail an emissions test?

- The U2409 code itself may not cause your vehicle to fail an emissions test, but it is an indication of a problem within the transmission system that should be addressed to ensure proper vehicle operation.

9. Can a DIY enthusiast repair the U2409 code, or should I seek professional help?

- Repairing the U2409 code may require advanced diagnostic tools and knowledge of automotive systems, so it is recommended to seek help from a professional mechanic for accurate diagnosis and repair.

10. How much does it typically cost to repair the U2409 code?

- The cost of repairing the U2409 code can vary depending on the underlying issue, but it may involve parts replacement, labor costs, and diagnostic fees, which can add up to a few hundred dollars.