AutoCodes – GMC – U1558 GMC

U1558 GMC Code - Body Control Module Lost Communication With Passenger 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 Passenger Seat Heating and Cooling Switch, Passenger Seat Heating and Cooling Switch harness is open or shorted, Passenger 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: U1558 GMC indicates Body Control Module Lost Communication With Passenger Seat Heating and Cooling Switch On LIN Bus.
Common causes: Common causes include Faulty Passenger Seat Heating and Cooling Switch, Passenger Seat Heating and Cooling Switch harness is open or shorted, Passenger 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 1,867

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 U1558 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 Passenger Seat Heating and Cooling Switch has not been received.

OBDII Code U1558 GMC - Body Control Module Lost Communication With Passenger Seat Heating and Cooling Switch On LIN Bus - AutoCodes.com — U1558 GMC Code - Body Control Module Lost Communication With Passenger Seat Heating and Cooling Switch On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1558 GMC?

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

How to Fix the DTC U1558 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 U1558 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 U1558 GMC Code

1. What are the common symptoms of OBDII code U1558 GMC related to the Body Control Module losing communication with the passenger seat heating and cooling switch on the LIN bus?

- Common symptoms include non-functional passenger seat heating and cooling controls, erratic behavior of the controls, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U1558 GMC indicating a communication issue with the passenger seat heating and cooling switch?

- The possible causes can include a faulty body control module, damaged wiring or connectors in the LIN bus communication network, or a malfunctioning passenger seat heating and cooling switch.

3. How can I diagnose the root cause of OBDII code U1558 GMC pertaining to the loss of communication with the passenger seat heating and cooling switch?

- Diagnosis typically involves conducting a thorough inspection of the wiring and connectors in the LIN bus system, testing the body control module for proper function, and checking the passenger seat heating and cooling switch.

4. Are there any specific repair tips for resolving OBDII code U1558 GMC associated with the communication problem with the passenger seat heating and cooling switch?

- Repair tips may include repairing or replacing damaged wiring or connectors, reprogramming or replacing the body control module if necessary, and testing the passenger seat heating and cooling switch for proper operation.

5. Can OBDII code U1558 GMC related to communication issues with the passenger seat heating and cooling switch impact the overall functionality of the vehicle?

- While this code typically affects the passenger seat heating and cooling controls, it may also indicate underlying communication issues within the vehicle's LIN bus system, which could potentially impact other systems.

6. Is it safe to continue driving with OBDII code U1558 GMC triggered due to the Body Control Module losing communication with the passenger seat heating and cooling switch?

- It is generally safe to drive with this code, but it is recommended to address the underlying communication issue promptly to ensure proper functioning of the passenger seat heating and cooling controls.

7. How much does it typically cost to repair OBDII code U1558 GMC related to the communication problem with the passenger seat heating and cooling switch?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for diagnostic testing, parts replacement, and labor charges, which can range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast fix OBDII code U1558 GMC associated with the Body Control Module losing communication with the passenger seat heating and cooling switch?

- While some basic troubleshooting and repairs may be possible for experienced DIY enthusiasts, diagnosing and repairing communication issues with the LIN bus system typically require specialized tools and expertise, making it advisable to seek professional help.

9. Will resetting the OBDII code U1558 GMC resolve the communication problem with the passenger seat heating and cooling switch?

- Resetting the code may temporarily clear the warning light, but it will not address the underlying communication issue. It is essential to diagnose and repair the root cause to ensure proper functionality of the passenger seat heating and cooling controls.

10. How long does it take to repair OBDII code U1558 GMC linked to the communication loss with the passenger seat heating and cooling switch?

- The repair time can vary based on the complexity of the issue, availability of parts, and the expertise of the technician. Typically, it may take a few hours to a full day to diagnose and repair the communication problem effectively.