Engine-Codes.com
Engine-Codes – Generic – U155D

U155D Code - Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus

Quick Answer

The U155D diagnostic trouble code (DTC) indicates that the Body Control Module (BCM) has lost communication with the right rear seat heating/venting/cooling switch on the Local Interconnect Network (LIN) bus. Common causes include Faulty wiring or connectors in the LIN bus network, A malfunctioning right rear seat heating/venting/cooling switch, BCM software or hardware issues. 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
U155D indicates Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus.
Common causes
Common causes include Faulty wiring or connectors in the LIN bus network, A malfunctioning right rear seat heating/venting/cooling switch, BCM software or hardware issues.
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 U155D Description

The U155D diagnostic trouble code (DTC) indicates that the Body Control Module (BCM) has lost communication with the right rear seat heating/venting/cooling switch on the Local Interconnect Network (LIN) bus. The LIN bus is a communication network used in modern vehicles to allow various modules to communicate with each other. In this case, the BCM, which is responsible for controlling various body functions such as lighting, door locks, and climate control, is unable to communicate with the switch that controls the heating, venting, and cooling functions of the right rear seat.

OBDII Code U155D - Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus
U155D Code - Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus

Common Causes of U155D

  1. Faulty wiring or connectors in the LIN bus network.
  2. A malfunctioning right rear seat heating/venting/cooling switch.
  3. BCM software or hardware issues.
  4. Water damage or corrosion affecting the communication system.
  5. Physical damage to the wiring harness or components in the system.

Symptoms of U155D

  1. Inability to control the temperature settings for the right rear seat.
  2. Malfunctioning climate control system for the right rear seat.
  3. Warning light on the dashboard indicating a communication fault.
  4. Other related functions controlled by the BCM may also be affected.

How to Fix U155D

  1. Perform a thorough inspection of the wiring harness, connectors, and components in the LIN bus network.
  2. Test the right rear seat heating/venting/cooling switch for proper functionality.
  3. Check for any software updates or reprogramming required for the BCM.
  4. Address any water damage or corrosion in the communication system.
  5. Replace any faulty wiring, connectors, switches, or BCM components as needed.

Cost to Fix U155D

The cost of repairing the U155D DTC 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. Keep in mind that additional diagnostic time may be needed to pinpoint the exact cause of the communication failure, which can impact the overall cost of the repair. It is recommended to consult with a qualified mechanic or dealership for a more accurate cost estimate based on your vehicle's make and model.

Need more information about the U155D code?

Need more information on how to fix the U155D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U155D code diagnosed by a professional: Find a repair shop in your area

Code U155D Information for Specific Makes

  • U155D Buick — Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus
  • U155D Cadillac — Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus
  • U155D Chevrolet — Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus
  • U155D GMC — Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN 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 U155D Code

1. What are common symptoms of OBDII code U155D?

- Common symptoms include malfunctioning right rear seat heating/cooling/venting controls, illuminated warning lights on the dashboard, and loss of communication with the right rear seat module.

2. What can cause the Body Control Module to lose communication with the right rear seat heating/cooling switch?

- The loss of communication can be caused by wiring issues, a faulty body control module, a malfunctioning right rear seat switch, or a problem with the LIN bus communication network.

3. How can I diagnose the U155D code related to the right rear seat controls?

- Diagnosing the U155D code involves using a diagnostic scanner to read the codes, checking the wiring connections for any damage or loose connections, and testing the right rear seat heating/cooling switch for proper functionality.

4. Can I still drive my vehicle with the U155D code present?

- It is generally safe to drive the vehicle with the U155D code, but it is advisable to have the issue diagnosed and repaired as soon as possible to avoid potential discomfort for passengers in the right rear seat.

5. Is it possible to reset the U155D code without repairs?

- Resetting the code without addressing the underlying issue may temporarily clear the code, but it is likely to reappear until the root cause of the communication loss is resolved.

6. How much does it typically cost to repair the U155D code related to the right rear seat controls?

- Repair costs can vary depending on the specific cause of the communication loss, but it may involve expenses for parts replacement, wiring repairs, or module reprogramming. It's recommended to consult a professional for an accurate estimate.

7. Are there any DIY repair tips for addressing the U155D code?

- DIY repair tips may include checking the wiring harness for visible damage, ensuring all connectors are securely plugged in, and using a multimeter to test for continuity in the wiring.

8. Can extreme weather conditions affect the occurrence of the U155D code?

- Extreme weather conditions can potentially exacerbate existing issues with the right rear seat heating/cooling system, leading to the triggering of the U155D code due to increased strain on the components.

9. How long does it typically take to repair the U155D code?

- The repair time for the U155D code can vary depending on the specific cause of the communication loss and the complexity of the repair process. It may range from a few hours to a full day in some cases.

10. Is the U155D code a common issue in certain vehicle models?

- The U155D code related to the body control module losing communication with the right rear seat controls can be more prevalent in vehicles equipped with advanced climate control systems and integrated seat functions.

Discuss the causes and fixes for U155D OBDII Code

Submit a New Comment

Code U155D comments

No comments found for this page.