AutoCodes – Chevrolet – B1840 2018 Chevrolet Silverado

B1840 2018 Chevrolet Silverado Code - Driver Seat Lumbar Up 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: B1840 2018 Chevrolet Silverado indicates Driver Seat Lumbar Up 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 846

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 B1840 2018 Chevrolet Silverado 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 B1840 2018 Chevrolet Silverado - Driver Seat Lumbar Up Switch Circuit - AutoCodes.com — B1840 2018 Chevrolet Silverado Code - Driver Seat Lumbar Up Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1840 2018 Chevrolet Silverado?

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 B1840 2018 Chevrolet Silverado?

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 B1840 2018 Chevrolet Silverado 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.

Need more information about the B1840 2018 Chevrolet Silverado code?

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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 B1840 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B1840 in a 2018 Chevrolet Silverado?

- The common symptoms include the driver seat lumbar up switch not functioning properly or being unresponsive.

2. What can cause the OBDII code B1840 in a 2018 Chevrolet Silverado?

- The code B1840 is typically triggered by a malfunction in the driver seat lumbar up switch circuit, which could be due to wiring issues or a faulty switch.

3. How can I diagnose the issue related to OBDII code B1840 in my 2018 Chevrolet Silverado?

- To diagnose the problem, you can start by checking the wiring connections to the driver seat lumbar up switch and testing the switch itself for functionality.

4. Can I fix the OBDII code B1840 in my 2018 Chevrolet Silverado myself?

- Depending on your automotive repair skills, you may be able to fix the issue yourself by repairing any damaged wiring or replacing the faulty driver seat lumbar up switch.

5. Is it safe to continue driving my 2018 Chevrolet Silverado with the OBDII code B1840?

- It is generally not recommended to drive the vehicle with unresolved OBDII codes, as they can indicate underlying issues that may affect the vehicle's performance or safety.

6. How much does it cost to repair the OBDII code B1840 in a 2018 Chevrolet Silverado at a professional auto repair shop?

- The cost of repairing the OBDII code B1840 can vary depending on the extent of the issue and labor rates, but it may involve diagnostic fees, parts replacement, and labor charges.

7. Can resetting the OBDII codes clear the B1840 code in a 2018 Chevrolet Silverado?

- Resetting the OBDII codes may temporarily clear the B1840 code, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.

8. Are there any recalls or technical service bulletins related to the OBDII code B1840 in a 2018 Chevrolet Silverado?

- It's recommended to check with a Chevrolet dealership or online resources for any recalls or technical service bulletins related to the specific OBDII code B1840 in your vehicle.

9. Will the OBDII code B1840 affect the overall performance of my 2018 Chevrolet Silverado?

- While the B1840 code may not directly impact the vehicle's drivability, it is important to address the issue to ensure all systems in the vehicle are functioning correctly.

10. How can I prevent the OBDII code B1840 from appearing in my 2018 Chevrolet Silverado in the future?

- Regularly inspecting and maintaining the driver seat lumbar up switch circuit, as well as addressing any related issues promptly, can help prevent the recurrence of the B1840 trouble code.