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B1840 Chevrolet Code - Driver Seat Lumbar Up Switch Circuit

Quick Answer

The B1840 code for Chevrolet vehicles specifically refers to an issue with the driver seat lumbar up switch circuit. Common causes include Faulty driver seat lumbar up switch, Damaged wiring or connectors in the lumbar support circuit, Blown fuse related to the driver seat lumbar support. 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 Chevrolet indicates Driver Seat Lumbar Up Switch Circuit.
Common causes
Common causes include Faulty driver seat lumbar up switch, Damaged wiring or connectors in the lumbar support circuit, Blown fuse related to the driver seat lumbar support.
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 11, 2024
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Code B1840 Chevrolet Description

The B1840 code for Chevrolet vehicles specifically refers to an issue with the driver seat lumbar up switch circuit. This code indicates that there is a malfunction in the electrical circuit that controls the lumbar support adjustment for the driver's seat. The lumbar support feature is designed to provide additional lower back support and comfort for the driver, and when the circuit that controls this feature is not functioning properly, it can lead to a lack of lumbar support adjustment.

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

Common Causes of B1840 Chevrolet

  1. Faulty driver seat lumbar up switch.
  2. Damaged wiring or connectors in the lumbar support circuit.
  3. Blown fuse related to the driver seat lumbar support.
  4. Issues with the driver seat control module.
  5. General wear and tear on the lumbar support mechanism.

Symptoms of B1840 Chevrolet

  1. Inability to adjust the lumbar support in the driver's seat.
  2. The lumbar support adjustment moves erratically or inconsistently.
  3. Illumination of the airbag warning light on the dashboard.
  4. Intermittent loss of power to the driver seat controls.
  5. Unusual noises coming from the driver seat when attempting to adjust the lumbar support.

How to Fix B1840 Chevrolet

  1. Begin by conducting a thorough inspection of the driver seat lumbar up switch circuit to identify any visible damage to wiring or connectors.
  2. Test the driver seat lumbar up switch using a multimeter to determine if it is functioning correctly.
  3. Check and replace any blown fuses related to the driver seat lumbar support.
  4. If the issue persists, consider replacing the driver seat control module.
  5. Clear the diagnostic trouble codes from the vehicle's system and test the lumbar support adjustment to ensure it is functioning properly.

Cost to Fix B1840 Chevrolet

The cost of repairing the driver seat lumbar up switch circuit can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the parts for this repair could range from $50 to $200, while the labor costs could be between $100 and $300. Keep in mind that these are rough estimates, and the actual repair costs may differ based on the location of the repair shop, the make and model of the vehicle, and the rates charged by the service provider. It is recommended to obtain quotes from multiple repair shops to compare prices and ensure a fair cost for the repair.

What does this mean?

Tech Notes for B1840 Chevrolet









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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 Chevrolet Code

1. What does the OBDII code B1840 mean on a Chevrolet?

The B1840 code indicates an issue with the driver seat lumbar up switch circuit, such as a fault in the wiring, switch, or related component.

2. What are the symptoms of the B1840 code on a Chevrolet?

Symptoms may include the lumbar support not adjusting upward, unresponsive lumbar controls, or intermittent functioning of the driver seat lumbar switch.

3. What causes the B1840 code to trigger?

Common causes include a faulty lumbar up switch, damaged wiring or connectors, or a malfunction in the seat control module.

4. How do I diagnose the B1840 code on my Chevrolet?

Begin by inspecting the lumbar switch and its wiring for damage, test the circuit with a multimeter, and check the seat control module for faults.

5. Can I still drive with the B1840 code active?

Yes, you can drive with this code active, but the lumbar support adjustment feature may not work, potentially reducing seat comfort.

6. How do I fix the B1840 code on a Chevrolet?

Repairs may involve replacing the lumbar up switch, repairing damaged wiring, reconnecting loose connectors, or recalibrating the seat control module.

7. How much does it cost to repair the B1840 code?

Repair costs can vary but typically range from $50 to $300 depending on whether the issue is with the switch, wiring, or seat control module.

8. Can a blown fuse cause the B1840 code?

While unlikely, it's possible if the fuse related to the seat controls is blown, so checking the fuse box is a good step in diagnosis.

9. Will clearing the B1840 code with a scanner fix the problem?

Clearing the code will reset the system temporarily, but the issue will likely return unless the underlying problem is resolved.

10. Do I need to replace the entire seat to fix the B1840 code?

No, the entire seat doesn't need replacement. The issue is typically resolved by repairing or replacing the specific faulty component in the lumbar up switch circuit.

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