AutoCodes – Generic – U2412

U2412 Code - Reductant Control Module Powertrain Sensor 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 Reductant Control Module, Reductant Control Module harness is open or shorted, Reductant 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: U2412 indicates Reductant Control Module Powertrain Sensor Bus Off.
Common causes: Common causes include Faulty Reductant Control Module, Reductant Control Module harness is open or shorted, Reductant 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 1,428

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 U2412 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 U2412 - Reductant Control Module Powertrain Sensor Bus Off - AutoCodes.com — U2412 Code - Reductant Control Module Powertrain Sensor Bus Off

What does this mean?

What are the Possible Causes of the DTC U2412?

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

How to Fix the DTC U2412?

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 U2412 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 U2412 code?

Need more information on how to fix the U2412 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2412 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2412 Buick — Reductant Control Module Powertrain Sensor Bus Off
U2412 Cadillac — Reductant Control Module Powertrain Sensor Bus Off
U2412 Chevrolet — Reductant Control Module Powertrain Sensor Bus Off
U2412 GMC — Reductant Control Module Powertrain Sensor 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 U2412 Code

1. What are the common symptoms of OBDII code U2412?

The common symptoms of U2412 include the malfunction indicator light (MIL) being illuminated, reduced engine performance, and potentially an inability to pass emissions testing.

2. What does the OBDII code U2412 indicate?

U2412 indicates a communication error with the Reductant Control Module Powertrain Sensor Bus, typically resulting in a loss of communication between control modules.

3. What are the possible causes of OBDII code U2412?

Possible causes of U2412 include damaged wiring or connectors, a faulty Reductant Control Module, software issues, or a defective Powertrain Control Module (PCM).

4. How can I diagnose the OBDII code U2412?

Diagnosing U2412 involves using a professional OBDII scanner to retrieve the code and then performing a thorough inspection of the wiring, connectors, and modules associated with the Reductant Control system.

5. Can I continue driving with the OBDII code U2412 present?

It is not recommended to continue driving with U2412 present, as it can lead to reduced engine performance and potential issues with emissions control.

6. How can I repair OBDII code U2412?

Repairing U2412 typically involves addressing the root cause of the communication error, which may include repairing damaged wiring, replacing faulty components, or updating software as needed.

7. Is it possible to reset OBDII code U2412 without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is crucial to address the underlying issue causing U2412 to prevent it from reoccurring.

8. Can a DIY enthusiast fix OBDII code U2412 at home?

DIY enthusiasts with the necessary tools and knowledge of automotive systems may be able to diagnose and repair U2412 at home, but professional assistance is recommended for complex issues.

9. How much does it cost to repair OBDII code U2412 at a mechanic?

The cost of repairing U2412 at a mechanic can vary depending on the root cause of the issue, but it may involve diagnostic fees, parts replacement, and labor costs.

10. Are there any preventative maintenance tips to avoid OBDII code U2412?

To prevent U2412, regular maintenance checks, such as inspecting wiring and connectors, keeping software up to date, and addressing any warning lights promptly, can help maintain the health of the Reductant Control system.