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Engine-Codes – GMC – B1790 GMC

B1790 GMC Code - Driver Seat Motor Lumbar Circuit

Quick Answer

The B1790 GMC code specifically refers to an issue with the driver seat motor lumbar circuit in a GMC vehicle. Common causes include Faulty lumbar support motor, Damaged wiring or connectors in the lumbar support circuit, Defective lumbar support switch. 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
B1790 GMC indicates Driver Seat Motor Lumbar Circuit.
Common causes
Common causes include Faulty lumbar support motor, Damaged wiring or connectors in the lumbar support circuit, Defective lumbar support switch.
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 B1790 GMC Description

The B1790 GMC code specifically refers to an issue with the driver seat motor lumbar circuit in a GMC vehicle. This code indicates that there is a malfunction in the circuit that controls the lumbar support feature of the driver's seat. The lumbar support feature is designed to provide additional lower back support and comfort for the driver, especially during long drives. When this circuit malfunctions, it can result in the loss of functionality of the lumbar support feature.

OBDII Code B1790 GMC - Driver Seat Motor Lumbar Circuit
B1790 GMC Code - Driver Seat Motor Lumbar Circuit

Common Causes of B1790 GMC

  1. Faulty lumbar support motor.
  2. Damaged wiring or connectors in the lumbar support circuit.
  3. Defective lumbar support switch.
  4. Issues with the seat control module.
  5. Electrical short or open circuit in the lumbar support circuit.

Symptoms of B1790 GMC

  1. Inability to adjust the lumbar support cushion.
  2. Lumbar support cushion stuck in one position.
  3. Unusual noises coming from the seat when attempting to adjust the lumbar support.
  4. Erratic or inconsistent movement of the lumbar support cushion.

How to Fix B1790 GMC

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to retrieve the B1790 code and identify the faulty component.
  2. Inspect the lumbar support motor, wiring, connectors, and switch for any visible damage or signs of wear.
  3. Test the lumbar support motor and switch for proper functionality using a multimeter.
  4. Replace any faulty components, such as the lumbar support motor, switch, or damaged wiring.
  5. Clear the B1790 code from the vehicle's system using the diagnostic scanner to ensure the issue has been resolved.

Cost to Fix B1790 GMC

The typical repair costs for addressing a B1790 GMC code related to the driver seat motor lumbar circuit can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair costs for this issue can range from $150 to $500, including parts and labor. However, it's important to note that the actual cost may be higher or lower based on factors such as the vehicle make and model, the extent of the repair needed, and the labor rates at the auto repair shop. It's recommended to consult with a professional mechanic or dealership to get a more accurate estimate based on the specific circumstances.

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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 B1790 GMC Code

1. What are the common symptoms of OBDII code B1790 GMC related to the Driver Seat Motor Lumbar Circuit?

- Common symptoms include the inability to adjust the lumbar support in the driver's seat or erratic movement of the lumbar support.

2. What are the possible causes of OBDII code B1790 GMC for the Driver Seat Motor Lumbar Circuit?

- The code B1790 can be triggered by a faulty lumbar support motor, damaged wiring or connectors in the circuit, or a malfunctioning lumbar control switch.

3. How can I diagnose the issue causing OBDII code B1790 GMC in the Driver Seat Motor Lumbar Circuit?

- Start by checking the lumbar control switch for proper functionality, inspecting the wiring and connectors for any visible damage, and testing the motor with a multimeter to determine if it is faulty.

4. Are there any quick tips for repairing OBDII code B1790 GMC related to the Driver Seat Motor Lumbar Circuit?

- Quick repair tips include checking and repairing any damaged wiring or connectors, replacing the lumbar support motor if needed, and resetting the error code to see if the issue persists.

5. Can I drive my vehicle with OBDII code B1790 GMC triggered for the Driver Seat Motor Lumbar Circuit?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the driver's seat remains comfortable and adjustable.

6. Is it possible to reset OBDII code B1790 GMC for the Driver Seat Motor Lumbar Circuit without fixing the underlying issue?

- While you can clear the error code using an OBDII scanner, it is crucial to diagnose and repair the root cause to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code B1790 GMC in the Driver Seat Motor Lumbar Circuit?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts such as a new lumbar support motor or labor for troubleshooting and repair.

8. Can a DIY enthusiast fix OBDII code B1790 GMC related to the Driver Seat Motor Lumbar Circuit?

- DIY enthusiasts with automotive repair knowledge and the right tools can attempt to diagnose and repair this issue, especially if it involves tasks like checking wiring or replacing components.

9. Are there any recalls or technical service bulletins related to OBDII code B1790 GMC for the Driver Seat Motor Lumbar Circuit?

- It's recommended to check with GMC dealership or online resources for any recalls or technical service bulletins specific to this OBDII code to see if there are related known issues or fixes.

10. How can I prevent OBDII code B1790 GMC from recurring in the future for the Driver Seat Motor Lumbar Circuit?

- Regularly inspecting and maintaining the driver's seat lumbar support system, avoiding putting excessive pressure on the lumbar support, and addressing any issues promptly can help prevent the code from coming back.

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