Engine-Codes.com
Engine-Codes – Generic – U18D0

U18D0 Code - Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus

Quick Answer

The U18D0 diagnostic trouble code indicates that the vehicle's engine control module (ECM) has lost communication with the Active Safety Control Module 2 on the high-speed Controller Area Network (CAN) bus. Common causes include Faulty wiring harness or connectors, Loose connections, Malfunctioning Active Safety Control Module 2. 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
U18D0 indicates Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus.
Common causes
Common causes include Faulty wiring harness or connectors, Loose connections, Malfunctioning Active Safety Control Module 2.
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 11, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U18D0 Description

The U18D0 diagnostic trouble code indicates that the vehicle's engine control module (ECM) has lost communication with the Active Safety Control Module 2 on the high-speed Controller Area Network (CAN) bus. The Active Safety Control Module 2 is responsible for various safety features in the vehicle, such as collision avoidance systems, lane departure warning, blind spot monitoring, and adaptive cruise control. When communication is lost with this module, it can affect the operation of these safety systems, potentially compromising the vehicle's overall safety.

OBDII Code U18D0 - Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus
U18D0 Code - Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus

Common Causes of U18D0

  1. Faulty wiring harness or connectors.
  2. Loose connections.
  3. Malfunctioning Active Safety Control Module 2.
  4. Software issues with the control modules.
  5. Corrosion in the CAN bus wiring.

Symptoms of U18D0

  1. Check engine light is illuminated on the dashboard.
  2. Loss of safety features such as collision avoidance or lane departure warning.
  3. Warning lights related to traction control, ABS, or airbag systems may appear.
  4. Vehicle may go into a "limp mode" with reduced power.

How to Fix U18D0

  1. Begin by inspecting the wiring harness and connectors for any visible damage or corrosion. Repair or replace any damaged components.
  2. Check and secure all connections related to the Active Safety Control Module 2.
  3. Scan the vehicle's computer system to identify the specific issue causing the communication error. Clear the code and see if it returns.
  4. If the problem persists, consider replacing the Active Safety Control Module 2 or reprogramming it with updated software.
  5. Perform a test drive to ensure that the safety features are functioning properly and that the code does not return.

Cost to Fix U18D0

The cost of repairing a communication error with the Active Safety Control Module 2 on the high-speed CAN bus can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. However, it's important to note that rates at auto repair shops can vary widely, so it's recommended to get a few quotes before proceeding with the repair. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the problem.

Need more information about the U18D0 code?

Need more information on how to fix the U18D0 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U18D0 code diagnosed by a professional: Find a repair shop in your area

Code U18D0 Information for Specific Makes

  • U18D0 Buick — Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus
  • U18D0 Cadillac — Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus
  • U18D0 Chevrolet — Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus
  • U18D0 GMC — Lost Communication With Active Safety Control Module 2 On High Speed CAN Bus
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 U18D0 Code

1. What are the common symptoms of OBDII code U18D0 - Lost Communication With Active Safety Control Module 2 on High Speed CAN Bus?

- Common symptoms include loss of communication with the active safety control module, warning lights on the dashboard, and potential issues with safety systems.

2. What are the possible causes of OBDII code U18D0?

- Possible causes can include a faulty active safety control module, damaged wiring harness, loose connections, or issues with the high-speed CAN bus communication network.

3. How can I diagnose the cause of OBDII code U18D0?

- To diagnose the issue, you can use a diagnostic scanner to check for trouble codes, inspect the wiring harness for damage, ensure all connections are secure, and perform a thorough system scan for any related faults.

4. Can OBDII code U18D0 be reset or cleared without fixing the underlying issue?

- While you can clear the code temporarily, it is important to address the root cause of the communication failure to prevent potential safety system malfunctions in the future.

5. Is it safe to drive with OBDII code U18D0 present?

- It is not recommended to drive with this code present, as it may indicate a loss of communication with critical safety systems that could compromise vehicle safety in certain situations.

6. How can I repair OBDII code U18D0 at home?

- Repairing this code may require professional diagnosis and repair due to the complexity of the active safety control module and CAN bus system. It is recommended to seek assistance from a qualified mechanic.

7. Can a dead battery cause OBDII code U18D0 to appear?

- A dead or low battery can sometimes lead to communication issues between modules, potentially triggering code U18D0. Ensuring the battery is in good condition is a good initial troubleshooting step.

8. How much does it typically cost to repair OBDII code U18D0?

- The cost of repairing this code can vary depending on the specific cause of the communication failure. Costs may include diagnostic fees, parts replacement, and labor, so it's best to get a quote from a professional.

9. Will fixing OBDII code U18D0 require reprogramming or reinitializing the active safety control module?

- Depending on the repair needed, reprogramming or reinitializing the active safety control module may be necessary to ensure proper communication and functionality after the issue is resolved.

10. Are there any recalls or technical service bulletins related to OBDII code U18D0?

- It's recommended to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to code U18D0, as there may be known issues or solutions available.

Discuss the causes and fixes for U18D0 OBDII Code

Submit a New Comment

Code U18D0 comments

No comments found for this page.