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B1840 2018 Chevrolet Silverado Code - Driver Seat Lumbar Up Switch Circuit

Quick Answer

The B1840 diagnostic trouble code (DTC) specifically relates to the driver seat lumbar up switch circuit in a 2018 Chevrolet Silverado. Common causes include Faulty lumbar up switch, Damaged or corroded wiring in the circuit, Issues with the seat 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
B1840 2018 Chevrolet Silverado indicates Driver Seat Lumbar Up Switch Circuit.
Common causes
Common causes include Faulty lumbar up switch, Damaged or corroded wiring in the circuit, Issues with the seat 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 10, 2024
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Code B1840 2018 Chevrolet Silverado Description

The B1840 diagnostic trouble code (DTC) specifically relates to the driver seat lumbar up switch circuit in a 2018 Chevrolet Silverado. This code indicates that there is a malfunction in the circuit responsible for controlling the movement of the driver's seat lumbar support in an upward direction. The lumbar support feature in modern vehicles allows drivers to adjust the lower back support for a more comfortable driving experience.

OBDII Code B1840 2018 Chevrolet Silverado - Driver Seat Lumbar Up Switch Circuit
B1840 2018 Chevrolet Silverado Code - Driver Seat Lumbar Up Switch Circuit

Common Causes of B1840 2018 Chevrolet Silverado

  1. Faulty lumbar up switch.
  2. Damaged or corroded wiring in the circuit.
  3. Issues with the seat control module.
  4. Loose connections or poor electrical connections.
  5. Physical obstruction preventing the seat from moving upward.

Symptoms of B1840 2018 Chevrolet Silverado

  1. Inability to adjust the driver seat lumbar support upwards.
  2. Unresponsive or intermittent functioning of the lumbar up switch.
  3. Illumination of the seat control module warning light on the dashboard.
  4. Strange noises coming from the seat when attempting to adjust the lumbar support.
  5. Uneven or uncomfortable seating position while driving.

How to Fix B1840 2018 Chevrolet Silverado

  1. Begin by diagnosing the root cause of the issue by using a diagnostic scanner to retrieve the specific trouble codes and pinpoint the problem area.
  2. Inspect the lumbar up switch for any signs of damage or malfunction. Replace the switch if necessary.
  3. Check the wiring in the circuit for any visible damage or corrosion. Repair or replace any damaged wiring.
  4. Test the seat control module to ensure it is functioning correctly. Replace the module if it is found to be faulty.
  5. Perform a thorough test of the driver seat lumbar support system to verify that the issue has been resolved and that the seat can now be adjusted properly.

Cost to Fix B1840 2018 Chevrolet Silverado

The cost of repairing a driver seat lumbar up switch circuit issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, you can expect to pay anywhere from $100 to $300 for parts and labor. However, it is important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Additionally, prices for parts can differ based on the vehicle make and model. It is recommended to consult with a trusted mechanic or dealership to get a more accurate estimate based on your particular situation.

What does this mean?

Tech Notes for B1840 2018 Chevrolet Silverado









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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.

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