AutoCodes – Buick – U2409 Buick

U2409 Buick 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 Buick 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 527

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

What does this mean?

What are the Possible Causes of the DTC U2409 Buick?

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 Buick?

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 Buick 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 Buick 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 U2409 Buick Code

1. What are the common symptoms of OBDII code U2409 in a Buick related to the Transmission Range Control Module High Speed CAN Bus Off?

- Common symptoms include transmission shifting issues, engine stalling, and the illumination of the Check Engine Light.

2. What are some possible causes of the U2409 code in a Buick?

- The U2409 code in a Buick can be caused by a faulty Transmission Range Control Module, damaged wiring or connectors in the CAN bus system, or a communication error between modules.

3. How can I diagnose the U2409 code in my Buick related to the Transmission Range Control Module High Speed CAN Bus Off?

- Diagnosing the U2409 code may involve using an OBDII scanner to retrieve the code, inspecting the wiring and connectors for any signs of damage, and testing the Transmission Range Control Module for proper functionality.

4. Can I drive my Buick with the U2409 code present?

- It is not recommended to drive your Buick with the U2409 code present, as it can lead to further transmission issues and potential safety hazards. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I repair the U2409 code related to the Transmission Range Control Module in my Buick?

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

6. Are there any common mistakes to avoid when dealing with the U2409 code in a Buick?

- One common mistake to avoid is overlooking basic checks such as inspecting the wiring and connectors for damage, as these issues can often be the root cause of the U2409 code.

7. Can a DIY enthusiast fix the U2409 code in a Buick themselves?

- While some DIY enthusiasts may have the skills to diagnose and repair the U2409 code, it is recommended to seek professional help, especially when dealing with transmission-related issues and electronic control modules.

8. How much does it typically cost to repair the U2409 code in a Buick?

- The cost of repairing the U2409 code in a Buick can vary depending on the underlying cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Is the U2409 code a common issue in Buick vehicles?

- The U2409 code related to the Transmission Range Control Module High Speed CAN Bus Off is not extremely common, but it can occur in Buick vehicles, particularly in models with electronic transmission control systems.

10. Can resetting the Check Engine Light resolve the U2409 code temporarily?

- Resetting the Check Engine Light may temporarily clear the U2409 code, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again by the vehicle's onboard diagnostics.