AutoCodes – GMC – B1820 2017 GMC Sierra

B1820 2017 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 2017 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 158

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 2017 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 2017 GMC Sierra - Driver Seat Recline Rearward Switch Circuit - AutoCodes.com — B1820 2017 GMC Sierra Code - Driver Seat Recline Rearward Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1820 2017 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 2017 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 2017 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 2017 GMC Sierra Code

1. What does OBDII code B1820 mean on a 2017 GMC Sierra?

B1820 indicates an issue with the driver seat recline rearward switch circuit, meaning the system detected a malfunction in this part of the seat adjustment controls.

2. What are the common symptoms of code B1820 in a 2017 GMC Sierra?

The driver seat may not recline backward properly, the switch may feel unresponsive, or you could notice limited or no movement when operating the recline function.

3. What causes the B1820 code to appear on a GMC Sierra?

Common causes include a faulty seat recline switch, damaged wiring or connectors in the circuit, or a malfunctioning seat control module.

4. Can a blown fuse cause the B1820 code?

Itâ€™s possible if the recline switch is on the same circuit as a blown fuse. However, the issue is more likely related to the switch, wiring, or control module.

5. How do I diagnose the B1820 code on my 2017 GMC Sierra?

Start by inspecting the seat recline switch, wiring, and connectors for damage or wear. Use a multimeter to test for continuity in the circuit, and check the seat control module for proper operation.

6. Can I still drive my GMC Sierra with the B1820 code?

Yes, the code does not affect drivability, but you may experience limited or no functionality of the driver seat recline feature.

7. How do you fix the B1820 code on a 2017 GMC Sierra?

Repairs may include replacing the driver seat recline switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the seat control module.

8. How much does it cost to fix the B1820 code?

Repair costs vary depending on the issue. Replacing the switch may cost $50â€“$150 in parts, while more extensive repairs involving wiring or the control module could range from $200â€“$500 or more.

9. Can I reset the B1820 code without repairing the issue?

You can clear the code using an OBDII scanner, but it will likely return unless the underlying issue is fixed.

10. Is the B1820 code covered under warranty for a 2017 GMC Sierra?

It depends on your vehicleâ€™s warranty coverage. If the issue is related to a defect in materials or workmanship and the warranty is still valid, it may be covered.