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Engine-Codes – GMC – B1845 2018 GMC Sierra

B1845 2018 GMC Sierra Code - Driver Seat Lumbar Down Switch Circuit

Quick Answer

The B1845 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Driver Seat Lumbar Down Switch Circuit. Common causes include Faulty driver seat lumbar support switch, Damaged or corroded wiring in the lumbar support circuit, Malfunctioning lumbar support motor. 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 2018 GMC Sierra indicates Driver Seat Lumbar Down Switch Circuit.
Common causes
Common causes include Faulty driver seat lumbar support switch, Damaged or corroded wiring in the lumbar support circuit, Malfunctioning lumbar support motor.
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 12, 2024
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Code B1845 2018 GMC Sierra Description

The B1845 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Driver Seat Lumbar Down Switch Circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the driver's seat lumbar support in the downward direction. The lumbar support feature in modern vehicles allows drivers to adjust the lower back support to their comfort level, promoting better posture and reducing fatigue during long drives.

OBDII Code B1845 2018 GMC Sierra - Driver Seat Lumbar Down Switch Circuit
B1845 2018 GMC Sierra Code - Driver Seat Lumbar Down Switch Circuit

Common Causes of B1845 2018 GMC Sierra

  1. Faulty driver seat lumbar support switch.
  2. Damaged or corroded wiring in the lumbar support circuit.
  3. Malfunctioning lumbar support motor.
  4. Loose connections in the lumbar support system.
  5. Issues with the vehicle's electrical system affecting the lumbar support circuit.

Symptoms of B1845 2018 GMC Sierra

  1. Inability to adjust the driver seat lumbar support downward.
  2. Unresponsive or erratic behavior from the lumbar support switch.
  3. Lumbar support moving in the wrong direction or getting stuck.
  4. Discomfort or back pain while driving due to improper lumbar support adjustment.

How to Fix B1845 2018 GMC Sierra

  1. Begin by disconnecting the vehicle's battery to prevent any electrical mishaps.
  2. Inspect the driver seat lumbar support switch for any visible damage or signs of malfunction.
  3. Check the wiring harness connected to the lumbar support system for any breaks, corrosion, or loose connections.
  4. Test the lumbar support motor to determine if it is functioning correctly.
  5. Replace any faulty components, such as the switch, wiring, or motor, and reassemble the system before testing its operation.

Cost to Fix B1845 2018 GMC Sierra

The typical repair costs for addressing a B1845 code related to the Driver Seat Lumbar Down Switch Circuit in a 2018 GMC Sierra can vary depending on the extent of the issue and the specific parts that need replacement. On average, the repair costs for this type of problem can range from $150 to $400, including parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Therefore, it's recommended to inquire about local rates for a more accurate estimate.

What does this mean?

Tech Notes for B1845 2018 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 2018 GMC Sierra Code

1. What does OBDII code B1845 for a 2018 GMC Sierra mean?

The code B1845 specifically relates to the Driver Seat Lumbar Down Switch Circuit in the vehicle.

2. What are the common symptoms of OBDII code B1845 in a 2018 GMC Sierra?

Common symptoms may include the driver seat lumbar down switch not functioning properly, the lumbar support not adjusting as expected, or an illuminated warning light on the dashboard.

3. What are the possible causes of OBDII code B1845 in a 2018 GMC Sierra?

Potential causes of this code may include a faulty driver seat lumbar down switch, wiring issues in the circuit, a blown fuse, or a malfunction in the seat control module.

4. How can I diagnose the OBDII code B1845 in my 2018 GMC Sierra?

Diagnosis typically involves inspecting the driver seat lumbar down switch and its wiring for any visible damage, checking the fuse related to the circuit, and using a diagnostic scanner to retrieve specific error codes.

5. Can I repair OBDII code B1845 in my 2018 GMC Sierra myself?

Depending on your level of automotive expertise, you may be able to repair the issue yourself by replacing the faulty lumbar switch, repairing damaged wiring, or addressing any other identified component failures.

6. Is it safe to continue driving with OBDII code B1845 present in a 2018 GMC Sierra?

While the vehicle may still be operable with this code, it is advisable to address the underlying issue promptly to avoid potential discomfort or inconvenience from a malfunctioning driver seat lumbar support.

7. How much does it typically cost to repair OBDII code B1845 in a 2018 GMC Sierra?

The cost of repairs can vary depending on the exact cause of the issue and whether you choose to fix it yourself or seek professional assistance. Costs may include parts and labor charges.

8. Are there any preventive measures to avoid OBDII code B1845 in a 2018 GMC Sierra?

Regularly inspecting and maintaining the driver seat lumbar support system, avoiding excessive force when adjusting the lumbar support, and promptly addressing any related issues can help prevent the occurrence of this fault code.

9. Can a DIY enthusiast reset OBDII code B1845 in a 2018 GMC Sierra without professional help?

Resetting the code can be done using an OBDII scanner to clear the error code. However, it is recommended to first diagnose and address the root cause of the issue to prevent the code from reappearing.

10. How long does it typically take to repair OBDII code B1845 in a 2018 GMC Sierra?

The repair time can vary based on the complexity of the issue and the repair approach taken. Simple fixes like replacing a switch may take a short time, while more intricate problems could require more extensive troubleshooting and repair work.

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