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

Quick Answer

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Body Control Module 'B', Body Control Module 'B' harness is open or shorted. 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 Controller Area Network (CAN) Communication System, Faulty Body Control Module 'B', Body Control Module 'B' harness is open or shorted.
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 338

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 27, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0142 2017 Toyota RAV4 Description

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Body Control Module 'B' has not been received.

OBDII Code U0142 2017 Toyota RAV4 - Lost Communication with Body Control Module 'B' - AutoCodes.com — U0142 2017 Toyota RAV4 Code - Lost Communication with Body Control Module 'B'

What does this mean?

What are the Possible Causes of the DTC U0142 2017 Toyota RAV4?

Faulty Controller Area Network (CAN) Communication System
Faulty Body Control Module 'B'
Body Control Module 'B' harness is open or shorted
Body Control Module 'B' circuit poor electrical connection

How to Fix the DTC U0142 2017 Toyota RAV4?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0142 2017 Toyota RAV4 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.

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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.