AutoCodes – Toyota – U0122 2018 Toyota RAV4

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

Quick Answer

The Engine Control Module (ECM) and Driving Support ECU Assembly to communicate signals with each sensor and ECU via Controller Area Network (CAN) communication. Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU circuit poor electrical connection. 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 Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU circuit poor electrical connection.
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 176

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 22, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0122 2018 Toyota RAV4 Description

The Engine Control Module (ECM) and Driving Support ECU Assembly to communicate signals with each sensor and ECU via Controller Area Network (CAN) communication. If there are any malfunctions in the communication circuit, one or more CAN communication system Diagnostic Trouble Codes (DTC) are output.

OBDII Code U0122 2018 Toyota RAV4 - Lost Communication with Vehicle Dynamics Control Module - AutoCodes.com — U0122 2018 Toyota RAV4 Code - Lost Communication with Vehicle Dynamics Control Module

What does this mean?

What are the Possible Causes of the DTC U0122 2018 Toyota RAV4?

Faulty Skid Control ECU (Brake Actuator Assembly)
Skid Control ECU harness is open or shorted
Skid Control ECU circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC U0122 2018 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 U0122 2018 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.

Need more information about the U0122 2018 Toyota RAV4 code?

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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.