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Engine-Codes – Generic – U0122

U0122 Code - Lost Communication with Vehicle Dynamics Control Module

Quick Answer

The U0122 code indicates that there is a communication problem between the vehicle's onboard computer system and the Vehicle Dynamics Control Module (VDCM). Common causes include Faulty wiring or connectors leading to poor communication between the main computer system and the VDCM, A malfunctioning VDCM unit, Software glitches or programming errors within the vehicle's computer system. 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 indicates Lost Communication with Vehicle Dynamics Control Module .
Common causes
Common causes include Faulty wiring or connectors leading to poor communication between the main computer system and the VDCM, A malfunctioning VDCM unit, Software glitches or programming errors within the vehicle's computer system.
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 12, 2024
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Code U0122 Description

The U0122 code indicates that there is a communication problem between the vehicle's onboard computer system and the Vehicle Dynamics Control Module (VDCM). The VDCM is a crucial component of the vehicle's stability control system, responsible for ensuring the vehicle maintains traction and stability during various driving conditions. When communication with the VDCM is lost, it can lead to a loss of control over the vehicle's stability features, potentially compromising the safety and performance of the vehicle.

OBDII Code U0122 - Lost Communication with Vehicle Dynamics Control Module
U0122 Code - Lost Communication with Vehicle Dynamics Control Module

Common Causes of U0122

  1. Faulty wiring or connectors leading to poor communication between the main computer system and the VDCM.
  2. A malfunctioning VDCM unit.
  3. Software glitches or programming errors within the vehicle's computer system.
  4. Water or moisture damage affecting the VDCM or wiring connections.
  5. Physical damage to the VDCM unit due to impact or wear and tear.

Symptoms of U0122

  1. Illuminated traction control or stability control warning lights on the dashboard.
  2. Loss of traction control or stability control functionality.
  3. Erratic or inconsistent braking behavior.
  4. Difficulty steering or maintaining control of the vehicle.
  5. Reduced overall vehicle performance and handling.

How to Fix U0122

  1. Begin by conducting a thorough inspection of the wiring harness and connectors associated with the VDCM to check for any visible damage or corrosion. Repair or replace any damaged components.
  2. Use a diagnostic scanner to reset the trouble code and attempt to re-establish communication between the main computer system and the VDCM.
  3. If the issue persists, consider replacing the VDCM unit with a new or refurbished unit to restore proper functionality.
  4. Update the software and firmware of the vehicle's computer system to ensure compatibility and proper communication with the VDCM.
  5. Test drive the vehicle to verify that the stability control system, traction control, and anti-lock braking system are functioning correctly after the repair.

Cost to Fix U0122

The cost of repairing a U0122 code can vary depending on the specific cause of the communication error and the extent of the repairs needed. In general, the cost of replacing a faulty VDCM unit can range from $500 to $1000, including parts and labor. However, additional costs may apply if there are other underlying issues that need to be addressed. It's advisable to consult with a certified mechanic or dealership to get an accurate estimate based on the make and model of the vehicle. Keep in mind that diagnostic time and labor rates can vary, so it's essential to inquire about these costs upfront.

What does this mean?

Tech Notes for U0122

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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Code U0122 Information for Specific Makes

  • U0122 Acura — F-CAN Malfunction Engine Control Module-Vehicle Stability Assist Modulator Control Unit
  • U0122 Buick — Lost Communication With Vehicle Stability Control Module
  • U0122 Cadillac — Lost Communication With Vehicle Stability Control Module
  • U0122 Chevrolet — Lost Communication With Vehicle Stability Control Module
  • U0122 Ford — Lost Communication With Vehicle Dynamics Control Module
  • U0122 GMC — Lost Communication With Vehicle Stability Control Module
  • U0122 Honda — F-CAN Malfunction Engine Control Module-Vehicle Stability Assist Modulator Control Unit
  • U0122 Infiniti — Lost Communication With Vehicle Dynamics Control Module
  • U0122 Lexus — Lost Communication with Vehicle Dynamics Control Module
  • U0122 Lincoln — Lost Communication With Vehicle Dynamics Control Module
  • U0122 Mercury — Lost Communication With Vehicle Dynamics Control Module
  • U0122 Nissan — Lost Communication With Vehicle Dynamics Control Module
  • U0122 Toyota — 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 Code

1. What are common symptoms of OBDII code U0122 (Lost Communication with Vehicle Dynamics Control Module)?

- Common symptoms include the traction control light being illuminated on the dashboard, difficulty controlling the vehicle's stability, and potential loss of traction control functionality.

2. What are possible causes of OBDII code U0122?

- Possible causes include a faulty vehicle dynamics control module, damaged wiring or connectors leading to the module, electrical interference, or a malfunction in the communication network.

3. How can I diagnose OBDII code U0122?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking for any additional related codes, inspecting the wiring and connectors for damage, and testing the vehicle dynamics control module for functionality.

4. Can OBDII code U0122 be fixed at home?

- While some DIY enthusiasts may attempt to address this code at home by checking for loose connections or damaged wiring, resolving communication issues with the vehicle dynamics control module often requires professional diagnostic tools and expertise.

5. Is it safe to drive with OBDII code U0122 present?

- It is generally not recommended to drive with this code present, as it can affect the vehicle's stability control system, potentially compromising safety on the road. It is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code U0122?

- Repair costs can vary depending on the exact cause of the communication issue. Costs may include diagnostic fees, replacement of the vehicle dynamics control module, wiring repairs, and labor charges, potentially ranging from a few hundred to over a thousand dollars.

7. Can a faulty ABS system trigger OBDII code U0122?

- Yes, a malfunctioning Anti-lock Braking System (ABS) can sometimes trigger code U0122, as the ABS system is closely related to the vehicle dynamics control module and may share communication components.

8. Are there any temporary fixes for OBDII code U0122?

- Temporary fixes such as resetting the system by disconnecting the battery or clearing the code with an OBDII scanner may temporarily remove the warning lights, but the underlying communication issue will likely persist and should be addressed properly.

9. How long does it usually take to repair OBDII code U0122?

- The repair time for this code can vary depending on the exact cause and complexity of the issue. Repairs may range from a few hours to a full day, especially if diagnostics and parts replacement are involved.

10. Can a software update resolve OBDII code U0122?

- In some cases, a software update provided by the vehicle manufacturer may address communication issues leading to code U0122. Checking for any available updates through a dealership or authorized service center is recommended.

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