U155D GMC 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) for GMC vehicles 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 Damaged wiring harness connecting the BCM and the switch, Faulty Right Rear Seat Heating/Venting/Cooling Switch, Malfunctioning Body Control Module. 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 GMC indicates Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus.
- Common causes
- Common causes include Damaged wiring harness connecting the BCM and the switch, Faulty Right Rear Seat Heating/Venting/Cooling Switch, Malfunctioning Body Control Module.
- 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 U155D GMC Description
The U155D diagnostic trouble code (DTC) for GMC vehicles 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 control modules to communicate with each other. In this case, the BCM is unable to establish communication with the switch responsible for controlling the right rear seat's heating, venting, and cooling functions.
Common Causes of U155D GMC
- Damaged wiring harness connecting the BCM and the switch.
- Faulty Right Rear Seat Heating/Venting/Cooling Switch.
- Malfunctioning Body Control Module.
- Poor electrical connection between components.
- Corrosion or water damage in the communication circuit.
Symptoms of U155D GMC
- Inability to adjust the temperature or airflow in the right rear seat.
- Incorrect or erratic readings on the climate control display.
- Malfunctioning or unresponsive right rear seat heating/cooling system.
- Illumination of the check engine light or BCM-related warning lights on the dashboard.
How to Fix U155D GMC
- Begin by conducting a thorough visual inspection of the wiring harness and connectors for any signs of damage or corrosion.
- Test the Right Rear Seat Heating/Venting/Cooling Switch for proper functionality using a multimeter.
- Use a diagnostic scan tool to communicate with the BCM and check for any stored fault codes or communication errors.
- If necessary, replace the faulty switch, repair damaged wiring, or reprogram the BCM to establish communication with the switch.
- Clear the DTC from the vehicle's memory and perform a final test to ensure that the right rear seat's climate control functions properly.
Cost to Fix U155D GMC
The typical repair costs for addressing the U155D DTC can vary depending on the specific cause of the communication failure. In general, replacing a faulty switch or repairing damaged wiring may cost between $100 to $300, including parts and labor. If the issue is related to a malfunctioning BCM, the repair costs could range from $300 to $800 or more, considering the cost of the new module and the labor involved in reprogramming it.
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Frequently Asked Questions about U155D GMC Code
1. What are the common symptoms of OBDII code U155D in a GMC vehicle?
- Common symptoms include malfunctioning right rear seat heating, venting, or cooling system, loss of communication with the switch, and illuminated warning lights on the dashboard.
2. What does the OBDII code U155D GMC indicate?
- The code U155D indicates that the Body Control Module has lost communication with the right rear seat heating/venting/cooling switch on the LIN bus.
3. What are the possible causes of the U155D code in a GMC vehicle?
- Possible causes include a faulty right rear seat heating/venting/cooling switch, damaged wiring or connectors, a malfunctioning Body Control Module, or communication bus issues.
4. How can I diagnose the U155D code in my GMC vehicle?
- Diagnosis involves inspecting the wiring and connectors related to the right rear seat switch, testing the switch itself for functionality, checking the Body Control Module for any faults, and scanning the LIN bus for communication issues.
5. What are some repair tips for resolving the U155D code in a GMC vehicle?
- Repair tips include repairing or replacing damaged wiring and connectors, replacing the faulty right rear seat switch if necessary, reprogramming or replacing the Body Control Module, and ensuring proper communication on the LIN bus.
6. Can the U155D code be cleared/reset without fixing the underlying issue?
- Clearing the code without addressing the root cause may temporarily turn off the warning light, but the issue will persist and the code is likely to return.
7. Is it safe to drive with the U155D code present in a GMC vehicle?
- It is generally safe to drive with this code, but the right rear seat heating/venting/cooling system may not function properly until the issue is resolved.
8. Can a DIY enthusiast fix the U155D code issue in a GMC vehicle?
- Depending on the specific cause, DIY enthusiasts with automotive repair experience may be able to address the issue by following diagnostic procedures and repair tips.
9. How much does it typically cost to repair the U155D code in a GMC vehicle?
- Repair costs can vary widely depending on the cause of the issue, but they may range from a few hundred to over a thousand dollars if professional diagnostic and repair services are required.
10. Will the U155D code cause any long-term damage to the vehicle if left unresolved?
- Leaving the issue unresolved may lead to continued malfunction of the right rear seat heating/venting/cooling system, but it is unlikely to cause significant long-term damage to the vehicle.
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