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U0123 2014 Toyota RAV4 Code - Lost Communication with Yaw Rate Sensor Module

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 Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly), Yaw Rate and Acceleration Sensor 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: U0123 2014 Toyota RAV4 indicates Lost Communication with Yaw Rate Sensor Module.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly), Yaw Rate and Acceleration Sensor 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 203

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 25, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0123 2014 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 Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly) has not been received.

OBDII Code U0123 2014 Toyota RAV4 - Lost Communication with Yaw Rate Sensor Module - AutoCodes.com — U0123 2014 Toyota RAV4 Code - Lost Communication with Yaw Rate Sensor Module

What does this mean?

What are the Possible Causes of the DTC U0123 2014 Toyota RAV4?

Faulty Controller Area Network (CAN) Communication System
Faulty Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly)
Yaw Rate and Acceleration Sensor harness is open or shorted
Yaw Rate and Acceleration Sensor circuit poor electrical connection

How to Fix the DTC U0123 2014 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 U0123 2014 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 U0123 2014 Toyota RAV4 Code

1. What does the OBDII code U0123 in a 2014 Toyota RAV4 indicate?

The code U0123 in a 2014 Toyota RAV4 indicates a "Lost Communication with Yaw Rate Sensor Module" error.

2. What are the common symptoms of a U0123 code in a Toyota RAV4?

Common symptoms of a U0123 code in a Toyota RAV4 include the ABS warning light or traction control light coming on, loss of stability control functionality, and potential issues with the vehicle's overall handling.

3. What are the possible causes of a U0123 code in a 2014 Toyota RAV4?

Possible causes of a U0123 code in a 2014 Toyota RAV4 include a faulty yaw rate sensor module, damaged wiring or connectors related to the yaw rate sensor, or a communication error within the vehicle's network.

4. How can I diagnose a U0123 code in my Toyota RAV4?

Diagnosing a U0123 code in your Toyota RAV4 typically involves using a diagnostic scanner to retrieve the specific fault codes, checking the wiring and connectors related to the yaw rate sensor module, and testing the sensor itself for proper functionality.

5. Can I still drive my Toyota RAV4 with a U0123 code present?

It is not recommended to drive your Toyota RAV4 with a U0123 code present, as it can affect the vehicle's stability control system and potentially compromise safety on the road.

6. How do I repair a U0123 code in my 2014 Toyota RAV4?

Repairing a U0123 code in a 2014 Toyota RAV4 may involve replacing the faulty yaw rate sensor module, repairing any damaged wiring or connectors, and clearing the error codes with a diagnostic tool.

7. Is it possible to reset a U0123 code in a Toyota RAV4 without making any repairs?

While you can clear the error code temporarily by resetting the system, the underlying issue causing the U0123 code will likely reappear unless the necessary repairs are made.

8. Can a DIY enthusiast fix a U0123 code in a Toyota RAV4?

Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair a U0123 code in a Toyota RAV4, especially if the issue is related to wiring or connectors.

9. How much does it cost to repair a U0123 code in a Toyota RAV4?

The cost of repairing a U0123 code in a Toyota RAV4 can vary depending on the exact cause of the issue, but it may involve expenses for parts, labor, and diagnostic services.

10. Are there any recalls or technical service bulletins related to the U0123 code in a 2014 Toyota RAV4?

It is recommended to check with Toyota dealerships or online resources for any recalls or technical service bulletins related to the U0123 code in a 2014 Toyota RAV4 to see if there are any known issues or remedies provided by the manufacturer.