U1550 Buick 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 Buick 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.
Code U1550 Buick Description
What are the Possible Causes of the DTC U1550 Buick?
- 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 Buick?
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 Buick 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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Frequently Asked Questions about U1550 Buick Code
What does the OBDII code U1550 mean on a Buick?
The U1550 code indicates that the Body Control Module (BCM) has lost communication with the Driver Seat Heating and Cooling Switch over the LIN (Local Interconnect Network) bus.
What are the common symptoms of the U1550 code?
Common symptoms include the driver’s seat heating or cooling functions not working, intermittent seat control issues, or no response from the seat heating/cooling switch.
What causes the U1550 code to appear on a Buick?
The code can be caused by a faulty seat heating and cooling switch, damaged LIN bus wiring, a malfunctioning BCM, or poor electrical connections.
Can a bad BCM cause the U1550 code?
Yes, a malfunctioning BCM can fail to communicate properly with the seat heating and cooling switch, triggering the U1550 code.
How can I fix the U1550 code on my Buick?
Start by inspecting the LIN bus wiring and connectors for damage or corrosion. If they’re intact, test the seat heating and cooling switch and replace it if faulty. If the issue persists, the BCM may need to be reprogrammed or replaced.
Will clearing the U1550 code fix the problem?
Clearing the code may temporarily reset the system, but the underlying communication issue must be resolved to prevent the code from returning.
Can a blown fuse cause the U1550 code?
While unlikely, a blown fuse related to the BCM or seat control system could disrupt communication and trigger the code.
How do I diagnose the U1550 code?
Use a scan tool to check for related codes, inspect the LIN bus wiring and connectors for damage, and test the driver seat heating and cooling switch for functionality.
Is the U1550 code specific to Buick vehicles?
No, the U1550 code can appear on other vehicles with similar systems, but the diagnosis and repair steps may vary by make and model.
Can I still drive my Buick with the U1550 code active?
Yes, the U1550 code typically doesn’t affect drivability, but the seat heating and cooling features may not function until the issue is resolved.
Discuss the causes and fixes for U1550 Buick OBDII Code
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