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Engine-Codes – GMC – B243A 2018 GMC Sierra

B243A 2018 GMC Sierra Code - Left Front Seat Heating Switch

Quick Answer

The B243A diagnostic trouble code (DTC) specifically relates to the left front seat heating switch in a 2018 GMC Sierra. Common causes include Faulty left front seat heating switch, Damaged wiring or connectors in the seat heating circuit, Blown fuse related to the seat heating system. 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
B243A 2018 GMC Sierra indicates Left Front Seat Heating Switch.
Common causes
Common causes include Faulty left front seat heating switch, Damaged wiring or connectors in the seat heating circuit, Blown fuse related to the seat heating system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 19, 2024
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Code B243A 2018 GMC Sierra Description

The B243A diagnostic trouble code (DTC) specifically relates to the left front seat heating switch in a 2018 GMC Sierra. This code indicates a problem with the electrical circuit or components associated with the left front seat heating switch. The seat heating switch allows the driver or passenger to control the heating function of the seat, providing comfort during cold weather. When this code is triggered, it means that there is a malfunction in the system that controls the left front seat heating switch.

OBDII Code B243A 2018 GMC Sierra - Left Front Seat Heating Switch
B243A 2018 GMC Sierra Code - Left Front Seat Heating Switch

Common Causes of B243A 2018 GMC Sierra

  1. Faulty left front seat heating switch
  2. Damaged wiring or connectors in the seat heating circuit
  3. Blown fuse related to the seat heating system
  4. Malfunctioning seat heating control module

Symptoms of B243A 2018 GMC Sierra

  1. Inoperative left front seat heating function
  2. Erratic behavior of the seat heating switch
  3. Illumination of the seat heating switch indicator light
  4. Burning smell or smoke coming from the seat heating switch area

How to Fix B243A 2018 GMC Sierra

  1. Begin by diagnosing the exact cause of the issue using a diagnostic scanner to retrieve the B243A code and perform electrical testing on the seat heating system components.
  2. Inspect the left front seat heating switch for any visible damage or signs of malfunction. Replace the switch if necessary.
  3. Check the wiring and connectors in the seat heating circuit for any damage or corrosion. Repair or replace any faulty components.
  4. Inspect the fuse related to the seat heating system and replace it if it is blown.
  5. If the issue persists, further diagnosis may be required to identify any underlying problems with the seat heating control module or other related components.

Cost to Fix B243A 2018 GMC Sierra

The typical repair costs for addressing the B243A code related to the left front seat heating switch in a 2018 GMC Sierra can vary depending on the exact cause of the issue and the labor rates at the auto repair shop. Generally, the cost of replacing a faulty seat heating switch can range from $100 to $200, while addressing wiring or connector issues may add to the total cost. The total repair cost, including parts and labor, could range from $150 to $400 or more. It is advisable to check with local auto repair shops for more accurate estimates based on the specific diagnosis and repair needed. Keep in mind that labor rates can vary between $80 and $150 per hour, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops.

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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 B243A 2018 GMC Sierra Code

1. What does the OBDII code B243A mean on a 2018 GMC Sierra?

The code B243A indicates an issue with the Left Front Seat Heating Switch, typically related to a malfunction in the switch's electrical circuit.

2. What are the common symptoms of the B243A code?

Symptoms include the left front seat heater not working, erratic seat heating behavior, or the seat heater switch not lighting up.

3. What causes the B243A code to appear?

Common causes include a faulty seat heating switch, damaged wiring or connectors, or a malfunctioning seat control module.

4. Can I still drive my 2018 GMC Sierra with the B243A code active?

Yes, the truck is safe to drive, but the left front seat heater functionality will likely be impaired.

5. How do I diagnose the B243A code?

Check the seat heating switch for physical damage, inspect the wiring and connectors for corrosion or breaks, and use a scan tool to verify the code and monitor the switch's electrical signals.

6. How can I fix the B243A code on my 2018 GMC Sierra?

Repairs may include replacing the seat heating switch, repairing damaged wiring, or recalibrating or replacing the seat control module.

7. How much does it cost to fix the B243A code?

The repair cost can range from $50 for a simple switch replacement to $300 or more if wiring or the seat control module needs repair or replacement.

8. Can a blown fuse cause the B243A code?

While uncommon, a blown fuse in the seat heating circuit could cause the code. Inspect and replace any blown fuses if necessary.

9. Does the B243A code require professional repair?

If you're comfortable with basic electrical diagnostics, you can inspect and replace the switch or wiring yourself. Otherwise, a professional mechanic is recommended.

10. Will clearing the B243A code fix the issue?

Clearing the code may temporarily remove the warning, but the underlying issue must be addressed to prevent it from returning.

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