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U0123 2015 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 2015 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 233

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 2015 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 2015 Toyota RAV4 - Lost Communication with Yaw Rate Sensor Module - AutoCodes.com — U0123 2015 Toyota RAV4 Code - Lost Communication with Yaw Rate Sensor Module

What does this mean?

What are the Possible Causes of the DTC U0123 2015 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 2015 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 2015 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 2015 Toyota RAV4 Code

1. What does the OBDII code U0123 on a 2015 Toyota RAV4 indicate?

The code U0123 indicates a "Lost Communication with Yaw Rate Sensor Module" error on the 2015 Toyota RAV4.

2. What are the common symptoms of a U0123 error in a 2015 Toyota RAV4?

Common symptoms include the traction control and stability control lights illuminating on the dashboard, loss of stability control functionality, and potential issues with the vehicle's ABS system.

3. What are some possible causes of the U0123 code in a 2015 Toyota RAV4?

Possible causes include a malfunctioning yaw rate sensor, damaged wiring or connectors leading to the sensor module, a faulty sensor module itself, or issues with the vehicle's CAN communication network.

4. How can I diagnose the U0123 code in my 2015 Toyota RAV4?

Diagnosis typically involves using a professional OBDII scanner to retrieve the specific error code, inspecting the yaw rate sensor and its connections for damage, and checking the vehicle's wiring for any signs of wear or corrosion.

5. Can I still drive my 2015 Toyota RAV4 with a U0123 error code?

While the vehicle may still be operational, it is not recommended to drive with a U0123 code present as it can affect the stability and safety systems of the vehicle, potentially leading to unsafe driving conditions.

6. How can I repair a U0123 error in my 2015 Toyota RAV4?

Repairing a U0123 error may involve replacing the yaw rate sensor, repairing or replacing damaged wiring and connectors, reprogramming the sensor module, or addressing any issues with the vehicle's communication network.

7. Is resetting the error code enough to fix the U0123 issue in a 2015 Toyota RAV4?

Simply resetting the error code may temporarily clear the warning lights, but it will not fix the underlying issue causing the U0123 code. Proper diagnosis and repair are necessary to resolve the problem.

8. How much does it typically cost to repair a U0123 error in a 2015 Toyota RAV4?

The cost of repairing a U0123 error can vary depending on the specific cause of the issue, but it may involve parts and labor costs ranging from $200 to $600 or more, depending on the extent of the repairs needed.

9. Are there any recalls or technical service bulletins related to the U0123 code in the 2015 Toyota RAV4?

It's recommended to check with Toyota dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or technical service bulletins related to the U0123 code in the 2015 Toyota RAV4.

10. Can a DIY enthusiast fix a U0123 error in a 2015 Toyota RAV4?

While some aspects of diagnosing and repairing a U0123 error may be tackled by experienced DIY enthusiasts, dealing with sensor modules, wiring, and communication networks may require specialized tools and expertise best handled by a professional mechanic.