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U0123 2017 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 2017 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 245

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 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 Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly) has not been received.

OBDII Code U0123 2017 Toyota RAV4 - Lost Communication with Yaw Rate Sensor Module - AutoCodes.com — U0123 2017 Toyota RAV4 Code - Lost Communication with Yaw Rate Sensor Module

What does this mean?

What are the Possible Causes of the DTC U0123 2017 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 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 U0123 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 U0123 2017 Toyota RAV4 Code

1. What does the OBDII code U0123 on a 2017 Toyota RAV4 mean?

The code U0123 indicates a "Lost Communication with Yaw Rate Sensor Module" error in the vehicle's system.

2. What are the common symptoms of U0123 in a 2017 Toyota RAV4?

Common symptoms include the malfunction indicator light (MIL) or check engine light illuminating on the dashboard, stability control issues, and potential loss of traction control functionality.

3. What are the possible causes of U0123 in a 2017 Toyota RAV4?

Potential causes of the U0123 code include a faulty yaw rate sensor module, damaged wiring or connectors related to the sensor module, or issues with the vehicle's control module.

4. How can I diagnose the U0123 code in a 2017 Toyota RAV4?

Diagnosing the U0123 code typically involves using an OBDII scanner to retrieve the specific fault code, checking the wiring and connectors for any visible damage, and testing the yaw rate sensor module for proper functionality.

5. Can I drive my 2017 Toyota RAV4 with the U0123 code present?

It is not recommended to drive your vehicle with the U0123 code active, as it may affect the vehicle's stability control system and traction control, potentially compromising safety.

6. How can I repair the U0123 code in a 2017 Toyota RAV4?

Repairing the U0123 code often involves replacing the faulty yaw rate sensor module, repairing any damaged wiring or connectors, and clearing the error code with an OBDII scanner.

7. Is it possible to reset the U0123 code in a 2017 Toyota RAV4 without repairs?

While you can reset the error code temporarily, it is crucial to address the underlying issue causing the U0123 code to prevent it from reoccurring and ensure the proper functioning of the vehicle's safety systems.

8. Will the U0123 code cause my 2017 Toyota RAV4 to fail an emissions test?

The U0123 code is related to the vehicle's stability control system and is unlikely to directly impact emissions. However, it is essential to address the issue promptly to ensure the overall health of your vehicle.

9. How much does it cost to repair the U0123 code in a 2017 Toyota RAV4?

The cost of repairing the U0123 code can vary depending on the specific cause of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed, such as the yaw rate sensor module.

10. Can a DIY enthusiast fix the U0123 code in a 2017 Toyota RAV4?

While some DIY enthusiasts may have the skills to diagnose and repair the U0123 code, it is recommended to consult a professional mechanic or technician, especially when dealing with complex electronic systems like the yaw rate sensor module.