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Engine-Codes – GMC – B1820 2018 GMC Sierra

B1820 2018 GMC Sierra Code - Driver Seat Recline Rearward Switch Circuit

Quick Answer

The B1820 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the driver seat recline rearward switch circuit. Common causes include Damaged wiring or connectors in the driver seat recline rearward switch circuit, Faulty recline switch, Malfunctioning control module. 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
B1820 2018 GMC Sierra indicates Driver Seat Recline Rearward Switch Circuit.
Common causes
Common causes include Damaged wiring or connectors in the driver seat recline rearward switch circuit, Faulty recline switch, Malfunctioning control module.
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 13, 2024
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Code B1820 2018 GMC Sierra Description

The B1820 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the driver seat recline rearward switch circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the recline function of the driver's seat, specifically when moving the seat in a rearward direction. The driver seat recline rearward switch circuit is part of the vehicle's seat control system, which allows the driver to adjust the seat position for comfort and driving ergonomics.

OBDII Code B1820 2018 GMC Sierra - Driver Seat Recline Rearward Switch Circuit
B1820 2018 GMC Sierra Code - Driver Seat Recline Rearward Switch Circuit

Common Causes of B1820 2018 GMC Sierra

  1. Damaged wiring or connectors in the driver seat recline rearward switch circuit.
  2. Faulty recline switch.
  3. Malfunctioning control module.
  4. Poor electrical connection.
  5. Wear and tear over time.

Symptoms of B1820 2018 GMC Sierra

  1. Inability to adjust the driver's seat recline position rearward.
  2. Unresponsive or erratic behavior when attempting to adjust the seat.
  3. Warning light illuminated on the dashboard.
  4. Audible clicking or buzzing noises when operating the seat controls.

How to Fix B1820 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring, connectors, and components in the driver seat recline rearward switch circuit to identify any visible damage or issues.
  2. Test the recline switch and control module for proper functionality using a multimeter or diagnostic tool.
  3. Replace any damaged wiring, connectors, switches, or control modules as needed.
  4. Clear the DTC from the vehicle's computer system using an OBD-II scanner.
  5. Test the seat recline function to ensure it is operating correctly after the repair.

Cost to Fix B1820 2018 GMC Sierra

The typical repair costs for addressing the B1820 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the cost of parts for this repair could range from $50 to $200, while labor costs could range from $100 to $300. Overall, the total cost of repairing the driver seat recline rearward switch circuit issue may fall between $150 and $500. It is important to note that these estimates are approximate and can vary based on the location, dealership rates, and the extent of the repair needed. It is advisable to consult with a professional mechanic for a more accurate cost assessment.

What does this mean?

Tech Notes for B1820 2018 GMC Sierra









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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 B1820 2018 GMC Sierra Code

1. What does OBDII code B1820 for a 2018 GMC Sierra indicate?

The code B1820 specifically relates to the Driver Seat Recline Rearward Switch Circuit in the vehicle.

2. What are the common symptoms of OBDII code B1820 on a 2018 GMC Sierra?

Common symptoms include the inability to adjust the driver seat to recline rearward or issues with the seat's positioning.

3. What are the potential causes of OBDII code B1820 on a 2018 GMC Sierra?

Possible causes include a faulty driver seat recline rearward switch, damaged wiring in the circuit, or a malfunctioning control module.

4. How can I diagnose the OBDII code B1820 on my 2018 GMC Sierra?

Diagnosis involves checking the wiring and connections related to the driver seat recline rearward switch, inspecting the switch itself, and using a scan tool to retrieve and interpret the trouble code.

5. Can I repair OBDII code B1820 on a 2018 GMC Sierra myself?

If you have experience with automotive electrical systems, you may be able to repair the issue by replacing the faulty switch, repairing damaged wiring, or addressing any other identified problems in the circuit.

6. Will OBDII code B1820 on a 2018 GMC Sierra cause the airbag light to come on?

While it's not directly related to the airbag system, unresolved issues with the driver seat recline rearward switch circuit could potentially trigger the airbag light due to the seat's connection to the vehicle's safety systems.

7. Is it safe to continue driving with OBDII code B1820 on a 2018 GMC Sierra?

It is generally safe to drive with this code, but it's recommended to address the issue promptly to ensure the proper functionality of the driver seat and related systems.

8. Can a loose connection cause OBDII code B1820 on a 2018 GMC Sierra?

Yes, a loose or poor connection in the driver seat recline rearward switch circuit can trigger the B1820 trouble code.

9. Are there any recalls related to OBDII code B1820 for a 2018 GMC Sierra?

Recalls specific to this code may vary, so it's advisable to check with GMC or the National Highway Traffic Safety Administration (NHTSA) for any relevant recall information.

10. How much does it typically cost to repair OBDII code B1820 on a 2018 GMC Sierra at a dealership?

Repair costs can vary depending on the exact cause of the issue and labor rates, but expect to pay for diagnostic time, parts, and labor, which could range from a couple of hundred to a few hundred dollars.

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