AutoCodes – Lexus – U1331 Lexus

U1331 Lexus Code - Software Incompatibility with Body Control Module

Quick Answer

This Diagnostic Trouble Code (DTC) is stored when the destination information of the Main Body ECU (Multiplex Network Body ECU) does not match that of the Blind Spot Monitor Sensors. Common causes include Faulty Main Body ECU (Multiplex Network Body ECU), Faulty Blind Spot Monitor Sensor Left, Faulty Blind Spot Monitor Sensor Right. 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: U1331 Lexus indicates Software Incompatibility with Body Control Module.
Common causes: Common causes include Faulty Main Body ECU (Multiplex Network Body ECU), Faulty Blind Spot Monitor Sensor Left, Faulty Blind Spot Monitor Sensor Right.
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 1,239

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 Mar 29, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1331 Lexus Description

This Diagnostic Trouble Code (DTC) is stored when the destination information of the Main Body ECU (Multiplex Network Body ECU) does not match that of the Blind Spot Monitor Sensors.

OBDII Code U1331 Lexus - Software Incompatibility with Body Control Module - AutoCodes.com — U1331 Lexus Code - Software Incompatibility with Body Control Module

What does this mean?

What are the Possible Causes of the DTC U1331 Lexus?

Faulty Main Body ECU (Multiplex Network Body ECU)
Faulty Blind Spot Monitor Sensor Left
Faulty Blind Spot Monitor Sensor Right

How to Fix the DTC U1331 Lexus?

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 U1331 Lexus 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 U1331 Lexus code?

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Get the U1331 Lexus 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 U1331 Lexus Code

1. What are the common symptoms of OBDII code U1331 in a Lexus related to software incompatibility with the Body Control Module?

- Common symptoms include dashboard warning lights, malfunctioning power windows, door locks, and lighting systems, as well as issues with keyless entry functions.

2. What are the possible causes of OBDII code U1331 in a Lexus?

- The code U1331 in a Lexus is often caused by software incompatibility between the vehicle's Body Control Module and other electronic control units due to a software update or programming error.

3. How can I diagnose OBDII code U1331 in my Lexus?

- Diagnosis of code U1331 usually involves using an OBDII scanner to read the fault codes stored in the vehicle's computer system and performing a thorough inspection of the Body Control Module and related components.

4. Can I continue driving my Lexus with OBDII code U1331 present?

- It is not recommended to continue driving your Lexus with code U1331 present, as it can lead to further electrical issues and potential safety hazards due to malfunctioning vehicle systems.

5. How can I repair OBDII code U1331 in my Lexus?

- Repairing code U1331 typically involves reprogramming or updating the software of the Body Control Module to ensure compatibility with other electronic control units in the vehicle.

6. Is it possible to reset OBDII code U1331 in a Lexus without professional help?

- While it may be possible to clear the code temporarily using an OBDII scanner, it is recommended to seek professional help to diagnose and repair the underlying software incompatibility issue.

7. Are there any software updates available to address OBDII code U1331 in Lexus vehicles?

- Lexus dealerships or authorized service centers may have software updates or patches available to address the software incompatibility causing code U1331 in affected vehicles.

8. Can aftermarket modifications cause OBDII code U1331 to appear in a Lexus?

- Yes, aftermarket modifications or installations that involve the vehicle's electronic systems can potentially trigger code U1331 if they are not compatible with the software of the Body Control Module.

9. How long does it typically take to repair OBDII code U1331 in a Lexus?

- The repair time for code U1331 can vary depending on the exact cause and extent of the software incompatibility issue, but it may take a few hours to a day for diagnosis and reprogramming.

10. Is OBDII code U1331 specific to Lexus vehicles, or can it occur in other car brands as well?

- While code U1331 is associated with software incompatibility in Lexus vehicles, similar issues related to Body Control Module can potentially occur in other car brands, leading to different fault codes.