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U0122 2017 Toyota RAV4 Code - Lost Communication with Vehicle Dynamics Control Module

Quick Answer

The U0122 diagnostic trouble code (DTC) for a 2017 Toyota RAV4 indicates that there is a communication issue between the vehicle's onboard computer system and the Vehicle Dynamics Control (VDC) module. Common causes include Faulty wiring or connectors leading to poor communication between the onboard computer system and the VDC module, A malfunctioning VDC module that is unable to transmit or receive data properly, Corrosion or damage to the wiring harnesses connected to the VDC module. 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
U0122 2017 Toyota RAV4 indicates Lost Communication with Vehicle Dynamics Control Module.
Common causes
Common causes include Faulty wiring or connectors leading to poor communication between the onboard computer system and the VDC module, A malfunctioning VDC module that is unable to transmit or receive data properly, Corrosion or damage to the wiring harnesses connected to the VDC module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code U0122 2017 Toyota RAV4 Description

The U0122 diagnostic trouble code (DTC) for a 2017 Toyota RAV4 indicates that there is a communication issue between the vehicle's onboard computer system and the Vehicle Dynamics Control (VDC) module. The VDC module is responsible for monitoring and controlling the vehicle's stability and traction control systems. When communication is lost with this module, it can lead to a variety of performance issues and potentially compromise the safety and handling of the vehicle.

OBDII Code U0122 2017 Toyota RAV4 - Lost Communication with Vehicle Dynamics Control Module
U0122 2017 Toyota RAV4 Code - Lost Communication with Vehicle Dynamics Control Module

Common Causes of U0122 2017 Toyota RAV4

  1. Faulty wiring or connectors leading to poor communication between the onboard computer system and the VDC module.
  2. A malfunctioning VDC module that is unable to transmit or receive data properly.
  3. Corrosion or damage to the wiring harnesses connected to the VDC module.
  4. Software issues within the onboard computer system that prevent proper communication with the VDC module.
  5. Electrical interference or a short circuit that disrupts the communication signal between the systems.

Symptoms of U0122 2017 Toyota RAV4

  1. Illumination of the traction control or stability control warning light on the dashboard.
  2. Loss of traction control or stability control functionality.
  3. Erratic or unpredictable handling characteristics, especially during cornering or in slippery conditions.
  4. Difficulty in controlling the vehicle during abrupt maneuvers.
  5. Other warning lights related to the VDC system may also illuminate.

How to Fix U0122 2017 Toyota RAV4

  1. Begin by conducting a thorough inspection of the wiring harnesses and connectors associated with the VDC module. Look for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring or connectors as needed.
  2. Check the VDC module itself for any visible damage or signs of malfunction. If necessary, replace the VDC module with a new or refurbished unit.
  3. Clear the DTC from the vehicle's onboard computer system using a diagnostic scan tool. This will reset the system and allow for a fresh start in communication between the modules.
  4. Test drive the vehicle to ensure that the stability and traction control systems are functioning properly and that the warning lights have been extinguished. Monitor the system for any recurring issues.
  5. If the problem persists, consult a professional mechanic or dealership for further diagnosis and repair. They may need to perform more in-depth testing to pinpoint the exact cause of the communication issue.

Cost to Fix U0122 2017 Toyota RAV4

The typical repair costs for addressing a U0122 code on a 2017 Toyota RAV4 can vary depending on the specific cause of the communication issue. In general, the cost of parts such as wiring harnesses, connectors, or a new VDC module can range from $200 to $800. Labor costs for diagnosis and repair can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair.

What does this mean?

Tech Notes for U0122 2017 Toyota RAV4

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.

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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 U0122 2017 Toyota RAV4 Code

1. What are the common symptoms of OBDII code U0122 in a 2017 Toyota RAV4?

- Common symptoms include the illumination of the check engine light, ABS light, traction control light, and potential loss of communication with the Vehicle Dynamics Control Module.

2. What does the OBDII code U0122 in a 2017 Toyota RAV4 indicate?

- The code U0122 indicates a communication problem between the vehicle's onboard computer system and the Vehicle Dynamics Control Module.

3. What are some possible causes of the U0122 code in a 2017 Toyota RAV4?

- Possible causes include damaged wiring or connectors, a faulty Vehicle Dynamics Control Module, a software issue, or a malfunction in the CAN bus communication network.

4. How can I diagnose the U0122 code in my 2017 Toyota RAV4?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, checking the wiring and connectors for any visible damage, and testing the Vehicle Dynamics Control Module for functionality.

5. Can I still drive my 2017 Toyota RAV4 with the U0122 code present?

- It is not recommended to drive the vehicle with the U0122 code present, as it may affect the performance of the vehicle's stability control system.

6. How can I repair the U0122 code in my 2017 Toyota RAV4?

- Repair options include fixing any damaged wiring or connectors, replacing the faulty Vehicle Dynamics Control Module, updating software, or addressing any issues with the CAN bus communication network.

7. Is it possible to reset the U0122 code in a 2017 Toyota RAV4 without addressing the underlying issue?

- While you can clear the code with an OBDII scanner, it is essential to diagnose and fix the underlying problem to prevent the code from reappearing.

8. Will the U0122 code in a 2017 Toyota RAV4 cause any long-term damage if left unaddressed?

- Leaving the U0122 code unresolved can potentially lead to further issues with the vehicle's stability control system and safety features, so it is best to address it promptly.

9. How long does it typically take to repair the U0122 code in a 2017 Toyota RAV4?

- The repair time can vary depending on the exact cause of the code, but it may take anywhere from a few hours to a day to diagnose and fix the issue.

10. Can a DIY enthusiast address the U0122 code in a 2017 Toyota RAV4, or is it best left to professionals?

- While some simple checks like inspecting wiring and connectors can be done by DIY enthusiasts, diagnosing and repairing the U0122 code often requires professional expertise and specialized equipment.

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