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B1845 2015 GMC Sierra Code - Driver Seat Lumbar Down Switch Circuit

Quick Answer

The B1845 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the driver seat lumbar down switch circuit. Common causes include Damaged or corroded wiring in the lumbar support circuit, Faulty driver seat lumbar down switch, Malfunctioning control module that regulates the lumbar support function. 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 2015 GMC Sierra indicates Driver Seat Lumbar Down Switch Circuit.
Common causes
Common causes include Damaged or corroded wiring in the lumbar support circuit, Faulty driver seat lumbar down switch, Malfunctioning control module that regulates the lumbar support function.
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 16, 2024
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Code B1845 2015 GMC Sierra Description

The B1845 diagnostic trouble code (DTC) for a 2015 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 is designed to provide additional lower back support and comfort for the driver. When this circuit malfunctions, it can lead to the inability to adjust the lumbar support in the downward direction.

OBDII Code B1845 2015 GMC Sierra - Driver Seat Lumbar Down Switch Circuit
B1845 2015 GMC Sierra Code - Driver Seat Lumbar Down Switch Circuit

Common Causes of B1845 2015 GMC Sierra

  1. Damaged or corroded wiring in the lumbar support circuit.
  2. Faulty driver seat lumbar down switch.
  3. Malfunctioning control module that regulates the lumbar support function.
  4. Defective lumbar support motor.
  5. Loose connections or poor electrical grounding in the circuit.

Symptoms of B1845 2015 GMC Sierra

  1. Inability to adjust the driver seat lumbar support in the downward direction.
  2. Lumbar support adjustment controls not responding.
  3. Unusual noises or vibrations when attempting to adjust the lumbar support.
  4. Lumbar support moving in the wrong direction or erratically.
  5. Warning light on the dashboard related to the lumbar support system.

How to Fix B1845 2015 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the lumbar support circuit, checking for any visible damage to wiring or connectors.
  2. Use a multimeter to test the continuity of the circuit components, including the switch, control module, and motor.
  3. Replace any damaged wiring, connectors, or components identified during the inspection and testing process.
  4. Clear the DTC from the vehicle's computer system using a diagnostic scan tool.
  5. Test the functionality of the lumbar support system to ensure that the issue has been resolved.

Cost to Fix B1845 2015 GMC Sierra

The cost of repairing the driver seat lumbar down switch circuit can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, you can expect to pay anywhere from $100 to $300 for parts and labor to address this problem. Keep in mind that labor rates at auto repair shops can range from $80 to $150 per hour, so the total cost may be higher in certain locations or at dealerships. It's recommended to obtain a detailed quote from a trusted mechanic or dealership to get a more accurate estimate for your specific vehicle.

What does this mean?

Tech Notes for B1845 2015 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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B1845 in a 2015 GMC Sierra related to the driver seat lumbar down switch circuit?

The common symptoms include the driver seat lumbar down switch not functioning properly, the seat lumbar support not adjusting, and the corresponding warning light illuminated on the dashboard.

2. What are the potential causes of OBDII code B1845 in a 2015 GMC Sierra?

Potential causes of this code 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 related to OBDII code B1845 in my 2015 GMC Sierra?

You can diagnose the problem by visually inspecting the wiring and connectors in the driver seat lumbar down switch circuit, testing the switch for proper functionality, and using a diagnostic scanner to retrieve trouble codes and data from the seat control module.

4. Is it safe to continue driving my 2015 GMC Sierra with OBDII code B1845 present?

While the vehicle may still be operational with this code, it is recommended to address the issue promptly to ensure the proper functioning of the driver seat lumbar down switch and to prevent any potential safety hazards.

5. Can I repair OBDII code B1845 in my 2015 GMC Sierra on my own?

Depending on your level of automotive knowledge and experience, you may be able to repair this code on your own by replacing the faulty driver seat lumbar down switch, repairing damaged wiring or connectors, or resetting the seat control module. Otherwise, seeking professional assistance is advised.

6. How much does it typically cost to repair OBDII code B1845 in a 2015 GMC Sierra at a repair shop?

The cost of repairing this code can vary depending on the specific cause of the issue and the labor rates of the repair shop. It is recommended to obtain multiple quotes from different shops to compare prices.

7. Are there any preventive maintenance tips to avoid OBDII code B1845 in my 2015 GMC Sierra in the future?

To prevent issues related to this code, you can periodically inspect the driver seat lumbar down switch and its wiring for any signs of wear or damage, avoid putting excessive pressure on the switch, and follow the manufacturer's recommended maintenance schedule for your vehicle.

8. Can OBDII code B1845 in a 2015 GMC Sierra be triggered by environmental factors?

While environmental factors are less likely to directly trigger this specific code, extreme temperatures or moisture can potentially contribute to electrical issues that may lead to the malfunction of the driver seat lumbar down switch circuit.

9. Will resetting the OBDII system clear the B1845 code in my 2015 GMC Sierra?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing OBDII code B1845 is not addressed, the code is likely to reappear once the problem is detected again by the vehicle's diagnostic system.

10. How long does it typically take to repair OBDII code B1845 related to the driver seat lumbar down switch circuit in a 2015 GMC Sierra?

The repair time can vary depending on the complexity of the issue and the availability of parts. In general, it may take a few hours to a day to diagnose and repair the problem associated with this code.

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