AutoCodes – Toyota – U0122 Toyota

U0122 Toyota 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 Toyota 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 9,730

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

What does this mean?

What are the Possible Causes of the DTC U0122 Toyota?

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 Toyota?

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 Toyota 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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Information for Specific Toyota Models

U0122 2013 Toyota RAV4 — Lost Communication with Vehicle Dynamics Control Module
U0122 2014 Toyota RAV4 — Lost Communication with Vehicle Dynamics Control Module
U0122 2015 Toyota RAV4 — Lost Communication with Vehicle Dynamics Control Module
U0122 2016 Toyota RAV4 — Lost Communication with Vehicle Dynamics Control Module
U0122 2017 Toyota RAV4 — Lost Communication with Vehicle Dynamics Control Module
U0122 2018 Toyota RAV4 — Lost Communication with Vehicle Dynamics Control Module

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 Toyota Code

1. What does the OBDII code U0122 for a Toyota mean?

U0122 indicates a communication problem between the vehicle's onboard computer system and the Vehicle Dynamics Control Module (VDCM).

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

Common symptoms include loss of traction control, stability control, or other related vehicle stability features. The dashboard may also display warning lights related to these systems.

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

Potential causes of the U0122 code include damaged wiring or connectors, a faulty VDCM module, a weak or dead vehicle battery, or a malfunctioning CAN bus network.

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

Diagnosing the U0122 code typically involves using an OBDII scanner to read the code and checking the VDCM module for any visible signs of damage. It may also require testing the wiring and connectors for continuity.

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

It is not recommended to drive the vehicle with the U0122 code active, as it can affect the operation of important safety systems like traction and stability control.

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

Repairing the U0122 code usually involves addressing the root cause, such as repairing damaged wiring, replacing faulty connectors, or replacing the VDCM module if necessary.

7. Can I reset the U0122 code in my Toyota on my own?

While you can clear the code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Is the U0122 code specific to Toyota vehicles?

The U0122 code is not specific to Toyota vehicles and can be found in other makes and models, indicating a similar communication issue with the Vehicle Dynamics Control Module.

9. Will the U0122 code cause my Toyota to fail an emissions test?

The U0122 code itself may not directly cause your Toyota to fail an emissions test, but it should be addressed promptly to ensure all vehicle systems are functioning properly.

10. Is it expensive to repair the U0122 code in a Toyota?

The cost to repair the U0122 code can vary depending on the specific cause of the issue. Simple fixes like repairing wiring may be less expensive compared to replacing a faulty VDCM module.