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B3921 Chevrolet Code - Group 2 Seat Motors Circuit Shorted

Quick Answer

The B3921 Chevrolet diagnostic trouble code (DTC) indicates a problem with the Group 2 Seat Motors Circuit being shorted. Common causes include Wiring issues, such as a short circuit or damaged wiring harness, Faulty seat motor control module, Water or moisture damage to the seat motors or wiring. 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
B3921 Chevrolet indicates Group 2 Seat Motors Circuit Shorted.
Common causes
Common causes include Wiring issues, such as a short circuit or damaged wiring harness, Faulty seat motor control module, Water or moisture damage to the seat motors or wiring.
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 B3921 Chevrolet Description

The B3921 Chevrolet diagnostic trouble code (DTC) indicates a problem with the Group 2 Seat Motors Circuit being shorted. This code is specific to Chevrolet vehicles and is related to the electrical system that controls the seat motors in the vehicle. The seat motors are responsible for adjusting the position of the seats, including moving them forward, backward, up, and down. When this circuit is shorted, it can lead to issues with the functionality of the seat motors, potentially causing them to malfunction or stop working altogether.

OBDII Code B3921 Chevrolet - Group 2 Seat Motors Circuit Shorted
B3921 Chevrolet Code - Group 2 Seat Motors Circuit Shorted

Common Causes of B3921 Chevrolet

  1. Wiring issues, such as a short circuit or damaged wiring harness.
  2. Faulty seat motor control module.
  3. Water or moisture damage to the seat motors or wiring.
  4. Loose or corroded electrical connections.
  5. Physical damage to the seat motors or wiring.

Symptoms of B3921 Chevrolet

  1. Inability to adjust the position of the seats.
  2. Seat motors not responding to control inputs.
  3. Strange noises coming from the seat motors when attempting to adjust the seats.
  4. Fuse for the seat motors repeatedly blowing.

How to Fix B3921 Chevrolet

  1. Begin by inspecting the wiring harness and connections for any signs of damage, corrosion, or loose connections.
  2. Test the seat motor control module to determine if it is functioning properly or needs to be replaced.
  3. Check for any water or moisture damage in the seat motors or wiring and address any issues found.
  4. Replace any damaged or faulty components, such as wiring, connectors, or seat motors, as needed.
  5. Clear the DTC from the vehicle's computer system and test the seat motors to ensure they are functioning correctly after the repair.

Cost to Fix B3921 Chevrolet

The typical repair costs for addressing a shorted Group 2 Seat Motors Circuit can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $150 to $300. Overall, the total repair cost for this issue is typically between $250 and $800. It's important to note that these are rough estimates, and actual costs may vary based on factors such as the vehicle make and model, the location of the repair shop, and the extent of the damage. It's recommended to consult with a qualified mechanic or repair shop for a more accurate cost estimate based on your specific situation.

What does this mean?

Tech Notes for B3921 Chevrolet

B3921 01 Group 2 Seat Motors Circuit Shorted to Battery or Open

B3921 02 Group 2 Seat Motors Circuit Shorted to Ground

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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 B3921 Chevrolet Code

1. What are the common symptoms of OBDII code B3921 Chevrolet (Group 2 Seat Motors Circuit Shorted)?

- Common symptoms include non-functional seat motor operation, inability to adjust seat position, and potential illumination of the airbag warning light.

2. What are the possible causes of OBDII code B3921 Chevrolet?

- The code B3921 Chevrolet typically indicates a short circuit in the wiring of the Group 2 seat motors, a malfunctioning seat motor, or a faulty control module.

3. How can I diagnose the reason behind OBDII code B3921 Chevrolet?

- To diagnose the issue, you can start by inspecting the wiring harness for any visible damage or signs of a short circuit. Testing the seat motors and control module using a multimeter can help pinpoint the exact cause.

4. Is it safe to drive with OBDII code B3921 Chevrolet present?

- It is generally not recommended to drive with the B3921 code active, as it can affect the proper functioning of the seat motors, potentially leading to discomfort or safety hazards while driving.

5. What are the repair options for fixing OBDII code B3921 Chevrolet?

- Repair options may include repairing or replacing damaged wiring, replacing the faulty seat motor, or reprogramming the control module. Professional diagnosis and repair are recommended to ensure proper resolution.

6. Can I reset OBDII code B3921 Chevrolet without fixing the underlying issue?

- While clearing the code temporarily may turn off the warning light, the issue causing the code will persist. It is crucial to address the root cause to prevent further problems.

7. How can I prevent OBDII code B3921 Chevrolet from recurring?

- Regular maintenance and inspections of the seat motors and wiring harness can help prevent issues that trigger the B3921 code. Addressing any related concerns promptly can also prevent the code from reoccurring.

8. Is the repair for OBDII code B3921 Chevrolet covered under warranty?

- Depending on the vehicle's warranty coverage and the specific cause of the code, repairs for B3921 Chevrolet may be covered. Check with your dealership or warranty provider for confirmation.

9. Can a DIY enthusiast fix OBDII code B3921 Chevrolet at home?

- While some basic troubleshooting steps can be performed at home, repairing OBDII code B3921 often requires specialized tools and expertise. It is advisable to consult a professional mechanic for proper diagnosis and repair.

10. Will OBDII code B3921 Chevrolet cause my vehicle to fail an emissions test?

- The B3921 code is related to the seat motors and is unlikely to directly impact emissions. However, it is essential to address all codes before undergoing emissions testing to ensure overall vehicle health.

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