AutoCodes – GMC – U1550 GMC

U1550 GMC 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 GMC 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 1,922

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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

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 GMC?

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 GMC 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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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 GMC Code

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

The common symptoms include non-functional driver seat heating or cooling, erratic behavior of the heating/cooling system, and possibly an illuminated warning light on the dashboard.

2. What are the potential causes of OBDII code U1550 in a GMC indicating a communication issue between the Body Control Module and the driver seat switch?

Possible causes may include a faulty driver seat heating and cooling switch, damaged wiring or connectors in the LIN bus network, or a malfunctioning Body Control Module.

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

Diagnosis typically involves using a diagnostic scan tool to retrieve the specific trouble codes, checking the wiring and connectors for any visible damage, and conducting tests to pinpoint the exact source of the communication failure.

4. What are some repair tips for addressing OBDII code U1550 in a GMC due to the Body Control Module communication issue with the driver seat switch?

Repair tips may include inspecting and repairing any damaged wiring or connectors, replacing the driver seat heating and cooling switch if necessary, or reprogramming the Body Control Module to establish proper communication.

5. Can I drive my GMC with OBDII code U1550 indicating a loss of communication between the Body Control Module and the driver seat switch?

It is generally not recommended to drive the vehicle with unresolved communication issues between critical components like the Body Control Module and driver seat switch. Addressing the problem promptly is advisable to prevent further complications.

6. Is it possible to reset the OBDII code U1550 in a GMC related to the Body Control Module and driver seat switch communication error?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the communication problem. It is essential to diagnose and repair the root cause to prevent the code from reoccurring.

7. Are there any recalls or technical service bulletins (TSBs) related to OBDII code U1550 in GMC vehicles for the Body Control Module communication problem with the driver seat switch?

It is recommended to check with a GMC dealership or online resources for any potential recalls or TSBs addressing the specific communication issue between the Body Control Module and the driver seat heating and cooling switch.

8. Can a DIY enthusiast without professional automotive experience troubleshoot and repair OBDII code U1550 in a GMC related to the Body Control Module communication issue with the driver seat switch?

While some basic troubleshooting steps like checking for visible wiring damage can be performed by DIY enthusiasts, diagnosing and repairing complex communication issues involving electronic control modules may require specialized knowledge and tools best handled by a professional mechanic.

9. How much can I expect to pay for repairing OBDII code U1550 in a GMC due to the Body Control Module losing communication with the driver seat switch?

The repair costs can vary depending on the specific cause of the communication problem, parts replacement, and labor charges. It is advisable to obtain estimates from reputable automotive repair shops or dealerships to determine the exact cost.

10. Is it common for OBDII code U1550 in a GMC related to the Body Control Module communication issue with the driver seat switch to recur after repair?

If the root cause of the communication problem is not effectively addressed during the initial repair, there is a possibility of the code reoccurring. Thorough diagnosis and proper repair techniques can help prevent the issue from coming back.