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U0142 2013 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 2013 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 368

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2013 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 2013 Toyota RAV4 - Lost Communication with Body Control Module 'B' - AutoCodes.com — U0142 2013 Toyota RAV4 Code - Lost Communication with Body Control Module 'B'

What does this mean?

What are the Possible Causes of the DTC U0142 2013 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 2013 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 2013 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 2013 Toyota RAV4 Code

1. What does the OBDII code U0142 mean on a 2013 Toyota RAV4?

The code U0142 indicates a loss of communication between the Engine Control Module (ECM) and the Body Control Module 'B' (BCM), which manages various vehicle functions.

2. What are the common symptoms of the U0142 code in a 2013 Toyota RAV4?

Symptoms may include malfunctioning interior lights, power windows, door locks, or issues with the vehicle's security or keyless entry system.

3. What causes the U0142 code to appear in a 2013 Toyota RAV4?

Common causes include a faulty BCM, damaged wiring or connectors, a dead battery, or a failed communication network between the modules.

4. Can a weak or dead battery trigger the U0142 code on a 2013 Toyota RAV4?

Yes, a weak or dead battery can disrupt communication between the modules and trigger the U0142 code.

5. How can I diagnose the U0142 code in a 2013 Toyota RAV4?

Start by checking the battery voltage, inspecting the BCM wiring and connectors for damage, and using a diagnostic scan tool to verify communication between vehicle modules.

6. Is it safe to drive a 2013 Toyota RAV4 with the U0142 code?

While the vehicle may still be drivable, the affected systems controlled by the BCM may not function properly, which could pose safety concerns depending on the issue.

7. How do I fix the U0142 code on a 2013 Toyota RAV4?

Repairs may include replacing or reprogramming the BCM, repairing damaged wiring or connectors, or addressing issues with the vehicle's power supply.

8. Can a software update resolve the U0142 code in a 2013 Toyota RAV4?

In some cases, a software update for the BCM or other related modules may resolve the communication issue.

9. How much does it cost to repair the U0142 code on a 2013 Toyota RAV4?

Repair costs vary but can range from $100 for minor wiring repairs to over $1,000 if the BCM needs to be replaced and reprogrammed.

10. Do I need to take my 2013 Toyota RAV4 to a dealer to fix the U0142 code?

While a dealer has specialized tools and BCM programming capabilities, some independent repair shops with advanced diagnostic equipment can also resolve this issue.