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U0142 2017 Toyota RAV4 Code - Lost Communication with Body Control Module 'B'

Quick Answer

The U0142 diagnostic trouble code (DTC) indicates that the vehicle's engine control module (ECM) has lost communication with the Body Control Module 'B'. Common causes include Faulty wiring or connectors between the ECM and BCM, Defective Body Control Module 'B', Software issues or programming errors. 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
U0142 2017 Toyota RAV4 indicates Lost Communication with Body Control Module 'B'.
Common causes
Common causes include Faulty wiring or connectors between the ECM and BCM, Defective Body Control Module 'B', Software issues or programming errors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code U0142 2017 Toyota RAV4 Description

The U0142 diagnostic trouble code (DTC) indicates that the vehicle's engine control module (ECM) has lost communication with the Body Control Module 'B'. The Body Control Module (BCM) is responsible for managing various electrical components and systems in the vehicle, such as interior and exterior lighting, power windows, door locks, and other convenience features. When communication is lost between the ECM and BCM, it can lead to a range of issues affecting the vehicle's performance and functionality.

OBDII Code U0142 2017 Toyota RAV4 - Lost Communication with Body Control Module 'B'
U0142 2017 Toyota RAV4 Code - Lost Communication with Body Control Module 'B'

Common Causes of U0142 2017 Toyota RAV4

  1. Faulty wiring or connectors between the ECM and BCM
  2. Defective Body Control Module 'B'
  3. Software issues or programming errors
  4. Electrical interference or poor grounding
  5. Water intrusion or corrosion in the module connectors

Symptoms of U0142 2017 Toyota RAV4

  1. Non-functioning power windows
  2. Interior lights not working
  3. Door locks malfunctioning
  4. Warning lights illuminated on the dashboard
  5. Vehicle may fail to start or exhibit poor performance

How to Fix U0142 2017 Toyota RAV4

  1. Begin by conducting a thorough inspection of the wiring and connectors between the ECM and BCM to check for any damage or loose connections.
  2. Test the Body Control Module 'B' for functionality and replace it if found to be defective.
  3. Check for any software updates or reprogramming required for the modules to establish communication.
  4. Address any electrical interference issues by ensuring proper grounding and shielding of wiring.
  5. Inspect for water intrusion or corrosion in the module connectors and address any issues found.

Cost to Fix U0142 2017 Toyota RAV4

The typical repair costs for resolving the U0142 code can vary depending on the specific cause of the communication loss and the extent of the repairs needed. In general, the cost of replacing a Body Control Module 'B' can range from $200 to $600, including parts and labor. Additional costs may apply for diagnostic testing, software updates, or any necessary wiring repairs. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary between different locations and types of repair facilities, so it's recommended to inquire about rates in your area for a more precise cost estimate.

What does this mean?

Tech Notes for U0142 2017 Toyota RAV4

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

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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 U0142 2017 Toyota RAV4 Code

1. What does the OBDII code U0142 for a 2017 Toyota RAV4 mean?

The U0142 code indicates a communication problem between the vehicle's main computer and the Body Control Module 'B'.

2. What are common symptoms of the U0142 code in a 2017 Toyota RAV4?

Common symptoms include issues with interior lights, power windows, door locks, and other body control functions not working properly.

3. What are possible causes of the U0142 code in a 2017 Toyota RAV4?

Possible causes include a faulty Body Control Module, damaged wiring or connectors, a software glitch, or a loss of power or ground to the module.

4. How can I diagnose the U0142 code in my 2017 Toyota RAV4?

Diagnosing the U0142 code typically involves checking the wiring and connectors leading to the Body Control Module, verifying power and ground connections, and using a diagnostic scanner to communicate with the module.

5. Can I still drive my 2017 Toyota RAV4 with the U0142 code?

It is not recommended to drive the vehicle with the U0142 code present, as it can affect critical body control functions and safety systems.

6. How can I repair the U0142 code in my 2017 Toyota RAV4?

Repairing the U0142 code often involves replacing the faulty Body Control Module, repairing any damaged wiring or connectors, and clearing the code with a diagnostic scanner.

7. Can a DIY enthusiast fix the U0142 code in a 2017 Toyota RAV4?

While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing the U0142 code may require specialized tools and expertise best handled by a professional mechanic.

8. How much does it cost to repair the U0142 code in a 2017 Toyota RAV4?

The cost of repairing the U0142 code can vary depending on the exact cause of the issue, but it may involve parts and labor expenses ranging from a few hundred to over a thousand dollars.

9. Will the U0142 code in a 2017 Toyota RAV4 cause the vehicle to fail an emissions test?

The U0142 code itself may not directly cause the vehicle to fail an emissions test, but it should be diagnosed and repaired to ensure proper functioning of the vehicle's body control systems.

10. How long does it take to repair the U0142 code in a 2017 Toyota RAV4?

The repair time for the U0142 code can vary based on the specific issue and the availability of parts, but it may take a few hours to a full day to diagnose and fix the problem.

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