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

Quick Answer

The U0142 diagnostic trouble code (DTC) for Toyota vehicles indicates that there is a communication problem between the vehicle's engine control module (ECM) and the body control module 'B'. Common causes include Faulty wiring or connectors, Corrosion in the electrical connections, Malfunctioning body control module 'B'. 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 Toyota indicates Lost Communication with Body Control Module 'B'.
Common causes
Common causes include Faulty wiring or connectors, Corrosion in the electrical connections, Malfunctioning body control module 'B'.
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 13, 2024
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Code U0142 Toyota Description

The U0142 diagnostic trouble code (DTC) for Toyota vehicles indicates that there is a communication problem between the vehicle's engine control module (ECM) and the body control module 'B'. The body control module 'B' is responsible for managing various functions related to the vehicle's body systems, such as lighting, door locks, windows, and other comfort and convenience features. When communication is lost with this module, it can lead to a range of issues affecting the vehicle's performance and functionality.

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

Common Causes of U0142 Toyota

  1. Faulty wiring or connectors
  2. Corrosion in the electrical connections
  3. Malfunctioning body control module 'B'
  4. Software issues in the ECM
  5. Physical damage to the wiring harness

Symptoms of U0142 Toyota

  1. Non-responsive power windows
  2. Inoperative door locks
  3. Malfunctioning interior lights
  4. No-start condition
  5. Warning lights illuminated on the dashboard

How to Fix U0142 Toyota

  1. Perform a thorough inspection of the wiring harness and connectors for any signs of damage or corrosion.
  2. Check the body control module 'B' for proper functioning and replace if necessary.
  3. Clear the DTC and reset the ECM to establish communication with the body control module 'B'.
  4. Test the vehicle to ensure that the communication issue has been resolved.
  5. If the problem persists, consult a professional technician for further diagnosis and repair.

Cost to Fix U0142 Toyota

The typical repair costs for addressing the U0142 code can vary depending on the specific issue causing the communication problem. In general, the cost of parts such as a new body control module 'B' and labor for diagnosis and repair can range from $200 to $500. However, it's important to note that the actual cost may be higher or lower based on factors such as the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. It's recommended to obtain quotes from multiple auto repair shops to get a more accurate estimate for this repair.

What does this mean?

Tech Notes for U0142 Toyota

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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Information for Specific Toyota Models

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.

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