AutoCodes – Chevrolet – B1840 2014 Chevrolet Silverado

B1840 2014 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 2014 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 199

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 2014 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 2014 Chevrolet Silverado - Driver Seat Lumbar Up Switch Circuit - AutoCodes.com — B1840 2014 Chevrolet Silverado Code - Driver Seat Lumbar Up Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1840 2014 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 2014 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 2014 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.

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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 2014 Chevrolet Silverado Code

1. What does the OBDII code B1840 mean in a 2014 Chevrolet Silverado?

The code B1840 indicates a problem with the Driver Seat Lumbar Up Switch Circuit, typically related to an electrical fault in the lumbar adjustment system.

2. What are common symptoms of the B1840 code in a 2014 Silverado?

Symptoms include the driver seat lumbar adjustment not working, intermittent functionality, or no response when pressing the lumbar up control.

3. What causes the B1840 code in a 2014 Silverado?

Common causes include a faulty lumbar up switch, a damaged or disconnected wiring harness, a short circuit, or a malfunctioning lumbar motor.

4. Can the B1840 code cause other issues in the vehicle?

This code is usually isolated to the lumbar adjustment system and does not typically affect other vehicle functions.

5. How do you diagnose the B1840 code in a 2014 Silverado?

Diagnosis involves inspecting the lumbar switch, checking for damaged or disconnected wiring, and using a multimeter to test for continuity and proper voltage in the circuit.

6. Can a blown fuse trigger the B1840 code in a 2014 Silverado?

Yes, a blown fuse in the power seat circuit could cause the lumbar adjustment system to fail, potentially triggering the B1840 code.

7. How is the B1840 code fixed in a 2014 Silverado?

Repairs may involve replacing the lumbar up switch, repairing or replacing damaged wiring, or replacing the lumbar motor if it is defective.

8. Is it safe to drive with the B1840 code in a 2014 Silverado?

Yes, the code does not impact the safety or drivability of the vehicle, but the lumbar adjustment function may not work properly.

9. How much does it cost to repair the B1840 code in a 2014 Silverado?

Repair costs can vary, but replacing a lumbar switch typically costs $50-$150 for parts and labor, while wiring repairs or a motor replacement may cost more.

10. Can the B1840 code clear itself in a 2014 Silverado?

The code is unlikely to clear itself unless the underlying issue is resolved, such as fixing a loose connection or replacing a faulty component.