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Engine-Codes – GMC – B1845 2014 GMC Sierra

B1845 2014 GMC Sierra Code - Driver Seat Lumbar Down Switch Circuit

Quick Answer

The B1845 diagnostic code for a 2014 GMC Sierra refers to an issue with the driver seat lumbar down switch circuit. Common causes include Faulty lumbar down switch, Wiring issues or loose connections in the circuit, Malfunctioning control module for seat adjustments. 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
B1845 2014 GMC Sierra indicates Driver Seat Lumbar Down Switch Circuit.
Common causes
Common causes include Faulty lumbar down switch, Wiring issues or loose connections in the circuit, Malfunctioning control module for seat adjustments.
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 B1845 2014 GMC Sierra Description

The B1845 diagnostic code for a 2014 GMC Sierra refers to an issue with the driver seat lumbar down 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 in modern vehicles allows the driver to adjust the lower back support for added comfort and ergonomics while driving.

OBDII Code B1845 2014 GMC Sierra - Driver Seat Lumbar Down Switch Circuit
B1845 2014 GMC Sierra Code - Driver Seat Lumbar Down Switch Circuit

Common Causes of B1845 2014 GMC Sierra

  1. Faulty lumbar down switch
  2. Wiring issues or loose connections in the circuit
  3. Malfunctioning control module for seat adjustments
  4. Water damage or corrosion in the electrical components
  5. Physical damage to the lumbar support mechanism

Symptoms of B1845 2014 GMC Sierra

  1. Inability to adjust the lumbar support in the driver's seat
  2. Lumbar support stuck in one position
  3. Erratic or inconsistent response when trying to adjust the lumbar support
  4. Illumination of the airbag warning light on the dashboard

How to Fix B1845 2014 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to read the fault codes and pinpoint the problem.
  2. Inspect the lumbar down switch and wiring for any visible signs of damage or wear. Replace any faulty components as needed.
  3. Check the control module for seat adjustments to ensure it is functioning correctly. Replace or reprogram the module if necessary.
  4. Test the lumbar support system after making repairs to ensure that it can be adjusted properly and that the issue has been resolved.
  5. Clear the diagnostic trouble codes from the vehicle's system using the diagnostic scanner to reset the warning light on the dashboard.

Cost to Fix B1845 2014 GMC Sierra

The cost of repairing the driver seat lumbar down switch circuit in a 2014 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor in your area. On average, the repair for this type of electrical issue can range from $150 to $400. This estimate includes the cost of any replacement parts, diagnostic fees, and labor charges. It's important to consult with a professional mechanic or dealership to get an accurate estimate based on your vehicle's specific needs and location. Keep in mind that labor rates can vary between different repair shops, so it's advisable to shop around for the best price.

What does this mean?

Tech Notes for B1845 2014 GMC Sierra









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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 B1845 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code B1845 in a 2014 GMC Sierra related to the Driver Seat Lumbar Down Switch Circuit?

The common symptoms include the driver seat lumbar down switch not functioning, the seat lumbar support not adjusting properly, or the seat lumbar making unusual noises.

2. What are the possible causes of OBDII code B1845 in a 2014 GMC Sierra?

Possible causes include a faulty driver seat lumbar down switch, damaged wiring or connectors in the circuit, or a malfunctioning seat control module.

3. How can I diagnose the issue causing OBDII code B1845 in my 2014 GMC Sierra?

You can diagnose the issue by checking the wiring and connectors related to the driver seat lumbar down switch, testing the switch for continuity, and using a scan tool to identify any specific faults in the circuit.

4. Can I still drive my 2014 GMC Sierra with OBDII code B1845 present?

While it may be possible to drive the vehicle with this code, it is recommended to address the issue promptly to avoid any potential safety concerns or further damage to the seat lumbar system.

5. How can I repair OBDII code B1845 in my 2014 GMC Sierra related to the Driver Seat Lumbar Down Switch Circuit?

Repair options include replacing the driver seat lumbar down switch, repairing any damaged wiring or connectors in the circuit, or resetting the seat control module.

6. Are there any DIY tips for troubleshooting OBDII code B1845 in a 2014 GMC Sierra?

You can start by visually inspecting the wiring and connectors for any obvious damage, checking the fuse related to the seat lumbar system, and testing the switch for proper functionality.

7. Is it safe to attempt repairing OBDII code B1845 in my 2014 GMC Sierra without prior experience?

If you are comfortable working with automotive electrical systems and have the necessary tools, you may attempt the repair. Otherwise, it is advisable to seek assistance from a professional mechanic.

8. Can weather or environmental factors contribute to triggering OBDII code B1845 in a 2014 GMC Sierra?

Extreme temperatures, moisture, or exposure to water can potentially damage the wiring or connectors in the driver seat lumbar down switch circuit, leading to the triggering of this fault code.

9. How long does it typically take to repair OBDII code B1845 in a 2014 GMC Sierra?

The repair time can vary depending on the exact cause of the issue and the expertise of the person performing the repair. It can range from a quick fix to a more involved troubleshooting process.

10. Will resetting the OBDII system clear the B1845 fault code in my 2014 GMC Sierra?

Resetting the OBDII system may temporarily clear the fault code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is best to diagnose and repair the root cause of the problem.

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