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Engine-Codes – GMC – B3921 GMC

B3921 GMC Code - Group 2 Seat Motors Circuit Shorted

Quick Answer

The B3921 GMC code indicates that there is a short circuit in the Group 2 seat motors circuit of the vehicle. Common causes include Damaged wiring or connectors in the seat motors circuit, Faulty seat control module, Short circuit in the seat motors 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
B3921 GMC indicates Group 2 Seat Motors Circuit Shorted.
Common causes
Common causes include Damaged wiring or connectors in the seat motors circuit, Faulty seat control module, Short circuit in the seat motors 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 09, 2024
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Code B3921 GMC Description

The B3921 GMC code indicates that there is a short circuit in the Group 2 seat motors circuit of the vehicle. This code specifically refers to an issue with the electrical circuit that controls the motors responsible for adjusting the seats in the vehicle. The seat motors are crucial for providing comfort and proper positioning for the driver and passengers. When this circuit is shorted, it can lead to malfunctioning of the seat motors, causing inconvenience and discomfort for the occupants of the vehicle.

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

Common Causes of B3921 GMC

  1. Damaged wiring or connectors in the seat motors circuit
  2. Faulty seat control module
  3. Short circuit in the seat motors circuit
  4. Water damage or corrosion in the electrical system
  5. Overloading of the seat motors causing a short circuit

Symptoms of B3921 GMC

  1. Inability to adjust the seat position
  2. Seat motors not responding to control inputs
  3. Erratic seat movement
  4. Seat getting stuck in one position
  5. Malfunctioning seat memory functions

How to Fix B3921 GMC

  1. Begin by inspecting the wiring and connectors in the Group 2 seat motors circuit for any signs of damage or corrosion.
  2. Test the seat control module to determine if it is functioning correctly or needs replacement.
  3. Check for any loose connections or shorts in the circuit that may be causing the issue.
  4. Replace any damaged wiring or connectors found during the inspection.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test the seat motors to ensure they are functioning properly.

Cost to Fix B3921 GMC

The typical repair costs for addressing a Group 2 Seat Motors Circuit Shorted issue can range from $200 to $500, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. For a more accurate estimate, it is advisable to inquire about local rates before proceeding with the repair.

What does this mean?

Tech Notes for B3921 GMC

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 GMC Code

1. What are the common symptoms of OBDII code B3921 GMC?

The common symptoms of OBDII code B3921 GMC, Group 2 Seat Motors Circuit Shorted, may include non-functioning or erratic movement of the affected seat motors.

2. What can cause the Group 2 Seat Motors Circuit Shorted code B3921 in a GMC vehicle?

This code can be caused by issues such as a short circuit in the wiring, a faulty seat motor, or a malfunctioning control module.

3. How can I diagnose the Group 2 Seat Motors Circuit Shorted code B3921 in my GMC?

Diagnosing this code typically involves checking the wiring harness for shorts, testing the seat motors for proper functionality, and inspecting the control module for any faults.

4. Is it safe to drive my GMC with the B3921 OBDII code triggered?

It is generally safe to drive your GMC with the B3921 code triggered, but it is recommended to address the issue promptly to avoid any inconvenience or potential safety concerns.

5. Can I repair the Group 2 Seat Motors Circuit Shorted code B3921 in my GMC myself?

Depending on your level of automotive expertise, you may be able to repair the B3921 code yourself by identifying and fixing the underlying cause, such as repairing a wiring short or replacing a faulty seat motor.

6. Will resetting the OBDII system clear the B3921 GMC trouble code?

Resetting the OBDII system may temporarily clear the B3921 trouble code, but if the underlying issue is not addressed, the code is likely to reappear upon further driving.

7. How much does it typically cost to repair the Group 2 Seat Motors Circuit Shorted code B3921 in a GMC?

The cost of repairing the B3921 code can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.

8. Are there any preventive measures to avoid triggering the B3921 OBDII code in my GMC?

To prevent the B3921 code from being triggered, you can perform regular inspections of the seat motors and wiring harness, ensuring they are in good condition and free from any damage or wear.

9. Can a faulty control module cause the B3921 GMC trouble code?

Yes, a faulty control module can be one of the potential causes of the B3921 trouble code, as it may affect the operation of the seat motors and lead to circuit shorts.

10. How urgent is it to address the Group 2 Seat Motors Circuit Shorted code B3921 in a GMC?

While it is not typically an emergency situation, addressing the B3921 code promptly is recommended to prevent further damage to the seat motors or electrical system of the vehicle.

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