AutoCodes – Generic – U1550

U1550 Code - Body Control Module Lost Communication With Driver Seat Heating and Cooling Switch On LIN Bus

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Driver Seat Heating and Cooling Switch, Driver Seat Heating and Cooling Switch harness is open or shorted, Driver Seat Heating and Cooling Switch 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: U1550 indicates Body Control Module Lost Communication With Driver Seat Heating and Cooling Switch On LIN Bus.
Common causes: Common causes include Faulty Driver Seat Heating and Cooling Switch, Driver Seat Heating and Cooling Switch harness is open or shorted, Driver Seat Heating and Cooling Switch 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 1,315

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1550 Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Body Control Module (BCM) from the Driver Seat Heating and Cooling Switch has not been received.

OBDII Code U1550 - Body Control Module Lost Communication With Driver Seat Heating and Cooling Switch On LIN Bus - AutoCodes.com — U1550 Code - Body Control Module Lost Communication With Driver Seat Heating and Cooling Switch On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1550?

Faulty Driver Seat Heating and Cooling Switch
Driver Seat Heating and Cooling Switch harness is open or shorted
Driver Seat Heating and Cooling Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC U1550?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1550 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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Need Help with the Code?

Get the U1550 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1550 Buick — Body Control Module Lost Communication With Driver Seat Heating and Cooling Switch On LIN Bus
U1550 Cadillac — Body Control Module Lost Communication With Driver Seat Heating and Cooling Switch On LIN Bus
U1550 Chevrolet — Body Control Module Lost Communication With Driver Seat Heating and Cooling Switch On LIN Bus
U1550 GMC — Body Control Module Lost Communication With Driver Seat Heating and 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 U1550 Code

1. What are the common symptoms of OBDII code U1550 related to the Body Control Module losing communication with the driver seat heating and cooling switch on the LIN bus?

The common symptoms include malfunctioning driver seat heating or cooling functions, inoperative seat controls, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code U1550 indicating a communication loss between the Body Control Module and the driver seat switch?

Potential causes include damaged wiring or connectors, a faulty driver seat switch, a malfunctioning Body Control Module, or issues with the LIN bus communication network.

3. How can I diagnose the cause of OBDII code U1550 related to the Body Control Module losing communication with the driver seat switch?

Diagnosis involves checking the wiring and connectors for damage, testing the driver seat switch for functionality, scanning the Body Control Module for fault codes, and inspecting the LIN bus communication network.

4. Can I repair OBDII code U1550 myself, or do I need to take my vehicle to a professional mechanic?

Depending on your expertise and access to diagnostic tools, you may be able to address the issue yourself by inspecting the wiring, connectors, and switch. However, if the problem lies with the Body Control Module or LIN bus, a professional mechanic may be required.

5. Are there any temporary solutions to consider if I encounter OBDII code U1550 before scheduling a repair?

A temporary solution could involve checking and resetting any loose connections, ensuring proper seating in the driver seat switch, and clearing the fault code to see if it reoccurs.

6. How crucial is it to address OBDII code U1550 concerning the Body Control Module's communication loss with the driver seat switch?

While your vehicle may still be operable with this code present, it is important to address communication issues promptly to prevent potential safety hazards and further damage to the vehicle's electronic systems.

7. Is there a risk of electrical shock or fire associated with OBDII code U1550 related to the driver seat switch communication problem?

As long as the issue is related to communication loss and not a direct electrical fault, the risk of electrical shock or fire is minimal. However, it is essential to address the underlying cause promptly to avoid potential safety risks.

8. Can extreme temperatures or environmental conditions contribute to the occurrence of OBDII code U1550 in vehicles?

Extreme temperatures or environmental conditions may exacerbate wiring issues or connector damage that could lead to communication problems between the Body Control Module and the driver seat switch, triggering OBDII code U1550.

9. How long does it typically take to repair OBDII code U1550 associated with the communication loss between the Body Control Module and the driver seat switch?

The repair time can vary based on the root cause of the issue. Simple fixes like reseating connectors or replacing a faulty switch may take a short time, while diagnosing and repairing complex issues with the Body Control Module or LIN bus could be more time-consuming.

10. What steps should I take if OBDII code U1550 persists after attempting repairs on the communication problem between the Body Control Module and the driver seat switch?

If the code persists after initial repair attempts, it is advisable to seek professional assistance from a qualified mechanic or automotive technician with experience in diagnosing and resolving complex electrical communication issues.