AutoCodes – GMC – B1820 2018 GMC Sierra

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

Quick Answer

The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster 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: B1820 2018 GMC Sierra indicates Driver Seat Recline Rearward Switch Circuit.
Common causes: Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster 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 159

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Apr 24, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B1820 2018 GMC Sierra Description

The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. When the power seat or lumbar switches are pressed, the appropriate signal circuit from the Seat Memory Control Module is pulled low through the switch contacts indicating the power seat command. The Seat Memory Control Module then commands the driver seat or lumbar to move in response to the switch signals. The Diagnostic Trouble Code (DTC) will be set when there is a short to ground on a switch signal circuit.

OBDII Code B1820 2018 GMC Sierra - Driver Seat Recline Rearward Switch Circuit - AutoCodes.com — B1820 2018 GMC Sierra Code - Driver Seat Recline Rearward Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1820 2018 GMC Sierra?

Faulty Driver Seat Adjuster Switch
Driver Seat Adjuster Switch harness is open or shorted
Driver Seat Adjuster Switch circuit poor electrical connection
Faulty Seat Memory Control Module

How to Fix the DTC B1820 2018 GMC Sierra?

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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1820 2018 GMC Sierra 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 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.