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B1845 2017 GMC Sierra Code - Driver Seat Lumbar Down Switch Circuit

Quick Answer

The B1845 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the driver seat lumbar down switch circuit. Common causes include Faulty lumbar adjustment switch, Damaged wiring or connectors in the circuit, Loose connections in the circuit. 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 2017 GMC Sierra indicates Driver Seat Lumbar Down Switch Circuit.
Common causes
Common causes include Faulty lumbar adjustment switch, Damaged wiring or connectors in the circuit, Loose connections in the circuit.
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 13, 2024
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Code B1845 2017 GMC Sierra Description

The B1845 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the driver seat lumbar down switch circuit. This code indicates a problem with the electrical circuit that controls the lumbar support adjustment in the driver's seat. The lumbar support feature allows the driver to adjust the lower back support to their preference, providing added comfort during long drives. When this circuit malfunctions, it can lead to the inability to adjust the lumbar support, potentially causing discomfort and affecting the driver's posture while driving.

OBDII Code B1845 2017 GMC Sierra - Driver Seat Lumbar Down Switch Circuit
B1845 2017 GMC Sierra Code - Driver Seat Lumbar Down Switch Circuit

Common Causes of B1845 2017 GMC Sierra

  1. Faulty lumbar adjustment switch.
  2. Damaged wiring or connectors in the circuit.
  3. Loose connections in the circuit.
  4. Issues with the seat control module.
  5. Electrical problems within the vehicle's interior system.

Symptoms of B1845 2017 GMC Sierra

  1. Inability to adjust the lumbar support downward.
  2. Check engine light illuminated on the dashboard.
  3. Unresponsive or erratic behavior from the lumbar adjustment switch.
  4. Strange noises coming from the seat when attempting to adjust the lumbar support.
  5. Discomfort or back pain while driving due to lack of lumbar support adjustment.

How to Fix B1845 2017 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to retrieve the trouble code and pinpoint the faulty component.
  2. Inspect the lumbar adjustment switch, wiring, and connectors for any visible damage or loose connections. Replace or repair any damaged parts.
  3. Test the circuit using a multimeter to check for continuity and proper voltage levels.
  4. If the issue lies with the seat control module, it may need to be replaced or reprogrammed by a professional technician.
  5. Clear the DTC from the vehicle's computer memory after completing the repair to reset the check engine light.

Cost to Fix B1845 2017 GMC Sierra

The cost of repairing a B1845 DTC related to the driver seat lumbar down switch circuit in a 2017 GMC Sierra can vary depending on the specific cause of the issue. On average, the repair costs for this type of electrical problem can range from $100 to $300, including parts and labor. However, prices may differ based on the location of the repair shop, the expertise of the technician, and the availability of replacement parts. It is recommended to consult with a trusted auto repair shop for a more accurate estimate based on your vehicle's specific needs. Keep in mind that diagnostic time and labor rates can also impact the overall cost of the repair.

What does this mean?

Tech Notes for B1845 2017 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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B1845 in a 2017 GMC Sierra related to the Driver Seat Lumbar Down Switch Circuit?

The common symptoms include the inability to adjust the driver seat lumbar support down, malfunctioning lumbar adjustment controls, or the lumbar support getting stuck in one position.

2. What are some possible causes of OBDII code B1845 in a 2017 GMC Sierra?

Potential causes of this code may include a faulty driver seat lumbar down switch, damaged wiring in the lumbar adjustment circuit, or a problem with the lumbar motor itself.

3. How can I diagnose the issue associated with OBDII code B1845 in a 2017 GMC Sierra?

To diagnose the problem, you can start by inspecting the wiring connected to the driver seat lumbar down switch, testing the switch for continuity, and checking the lumbar motor for proper functionality.

4. Can I repair OBDII code B1845 in a 2017 GMC Sierra on my own?

Depending on your skill level and access to tools, you may be able to repair this code on your own by replacing the faulty lumbar down switch, repairing damaged wiring, or addressing issues with the lumbar motor.

5. Is it safe to continue driving my 2017 GMC Sierra with OBDII code B1845 related to the Driver Seat Lumbar Down Switch Circuit?

It is generally safe to drive the vehicle with this code, but it may be uncomfortable for the driver if the lumbar support is stuck in an uncomfortable position. It is advisable to address the issue promptly.

6. Are there any reset procedures I can try to clear OBDII code B1845 in my 2017 GMC Sierra?

You can attempt to clear the code by disconnecting the car battery for a few minutes, but it is recommended to diagnose and repair the underlying issue to prevent the code from reoccurring.

7. How much can I expect to pay to fix OBDII code B1845 in a 2017 GMC Sierra at a mechanic or dealership?

The cost of fixing this code can vary depending on the labor rates and the specific repairs needed. It is best to contact a mechanic or dealership for an accurate estimate.

8. Can extreme temperatures or humidity affect the occurrence of OBDII code B1845 in a 2017 GMC Sierra?

Extreme temperatures or humidity can potentially impact the electrical components involved in the lumbar adjustment circuit, leading to issues that trigger this OBDII code.

9. Will fixing OBDII code B1845 in a 2017 GMC Sierra require resetting or reprogramming any vehicle systems?

In most cases, simply fixing the underlying issue should clear the code without the need for resetting or reprogramming any vehicle systems.

10. Is OBDII code B1845 specific to the 2017 GMC Sierra, or can it occur in other vehicle models as well?

While this code is associated with the 2017 GMC Sierra's Driver Seat Lumbar Down Switch Circuit, similar issues with lumbar adjustment controls can potentially trigger similar codes in other vehicle models.

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