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U0122 2018 Toyota RAV4 Code - Lost Communication with Vehicle Dynamics Control Module

Quick Answer

The U0122 diagnostic trouble code (DTC) for a 2018 Toyota RAV4 indicates that there is a communication problem between the vehicle's onboard computer system and the Vehicle Dynamics Control Module (VDCM). Common causes include Loose or corroded wiring connections between the vehicle's computer system and the VDCM, Faulty sensors that provide data to the VDCM, A malfunctioning VDCM unit. 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 2018 Toyota RAV4 indicates Lost Communication with Vehicle Dynamics Control Module.
Common causes
Common causes include Loose or corroded wiring connections between the vehicle's computer system and the VDCM, Faulty sensors that provide data to the VDCM, A malfunctioning VDCM unit.
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 29, 2024
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Code U0122 2018 Toyota RAV4 Description

The U0122 diagnostic trouble code (DTC) for a 2018 Toyota RAV4 indicates that there is a communication problem between the vehicle's onboard computer system and the Vehicle Dynamics Control Module (VDCM). The VDCM is responsible for monitoring and controlling various aspects of the vehicle's stability and traction control systems. When communication is lost with this module, it can lead to issues with the vehicle's handling, stability, and overall safety.

OBDII Code U0122 2018 Toyota RAV4 - Lost Communication with Vehicle Dynamics Control Module
U0122 2018 Toyota RAV4 Code - Lost Communication with Vehicle Dynamics Control Module

Common Causes of U0122 2018 Toyota RAV4

  1. Loose or corroded wiring connections between the vehicle's computer system and the VDCM.
  2. Faulty sensors that provide data to the VDCM.
  3. A malfunctioning VDCM unit.
  4. Issues with the vehicle's main computer system or software.
  5. Water damage or exposure to extreme temperatures affecting the VDCM.

Symptoms of U0122 2018 Toyota RAV4

  1. Illuminated ABS or traction control warning lights on the dashboard.
  2. Decreased traction and stability while driving, especially on slippery surfaces.
  3. Difficulty steering or a feeling of instability during cornering.
  4. Loss of control or erratic behavior when braking or accelerating.
  5. Inability to engage traction control or stability control features.

How to Fix U0122 2018 Toyota RAV4

  1. Begin by conducting a thorough inspection of the wiring connections between the vehicle's computer system and the VDCM. Repair or replace any damaged or corroded wires.
  2. Check and test the sensors that provide data to the VDCM to ensure they are functioning correctly. Replace any faulty sensors.
  3. If the VDCM is found to be malfunctioning, it may need to be replaced with a new unit.
  4. Perform a diagnostic scan and reset the communication system between the vehicle's computer and the VDCM to ensure proper functionality.
  5. Test drive the vehicle to verify that the communication issue has been resolved and that all stability and traction control systems are functioning as intended.

Cost to Fix U0122 2018 Toyota RAV4

The typical repair costs for addressing a U0122 code on a 2018 Toyota RAV4 can vary depending on the specific cause of the communication issue. In general, the cost of parts such as sensors or a new VDCM unit can range from $200 to $800. Labor costs for diagnosis and repair can add an additional $100 to $300 to the total bill. It's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as location, vehicle make and model, and the extent of the repair needed can also impact the final cost. For a more accurate estimate, it is recommended to consult with a local auto repair shop.

What does this mean?

Tech Notes for U0122 2018 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 2018 Toyota RAV4 Code

1. What does the OBDII code U0122 on a 2018 Toyota RAV4 mean?

The U0122 code indicates a communication issue between the vehicle's engine control module (ECM) and the Vehicle Dynamics Control (VDC) module.

2. What are the common symptoms of U0122 code in a 2018 Toyota RAV4?

Common symptoms include ABS warning light, traction control warning light, and possible loss of stability control functions.

3. What are the possible causes of the U0122 code in a 2018 Toyota RAV4?

Potential causes include damaged wiring or connectors, a faulty VDC module, ECM issues, or a malfunctioning CAN bus communication system.

4. How can I diagnose the U0122 code on my 2018 Toyota RAV4?

Diagnosis typically involves checking the wiring and connectors for damage, inspecting the VDC module, and using a diagnostic scanner to monitor communication between the ECM and VDC module.

5. Can I still drive my 2018 Toyota RAV4 with the U0122 code present?

It's not recommended to drive the vehicle with the U0122 code as it may affect stability control functions and compromise safety.

6. How can I repair the U0122 code on my 2018 Toyota RAV4?

Repair options include fixing damaged wiring, replacing faulty connectors, repairing or replacing the VDC module, or addressing any ECM issues.

7. Will resetting the trouble codes make the U0122 code disappear?

Simply clearing the codes may temporarily remove the warning lights, but the underlying issue causing the U0122 code will likely persist and trigger the codes again.

8. Can extreme weather conditions cause the U0122 code in a 2018 Toyota RAV4?

While extreme weather conditions may not directly cause the U0122 code, they could potentially exacerbate existing issues with the vehicle's communication systems.

9. Is it possible to prevent the U0122 code from occurring in my 2018 Toyota RAV4?

Regular maintenance, avoiding water damage, and promptly addressing any warning lights related to the ABS or traction control systems can help prevent the U0122 code.

10. Should I attempt to fix the U0122 code in my 2018 Toyota RAV4 myself or seek professional help?

Due to the complexity of diagnosing and repairing communication issues, it's generally recommended to seek the assistance of a qualified mechanic or dealership to address the U0122 code.

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