AutoCodes – GMC – B3920 2014 GMC Sierra

B3920 2014 GMC Sierra Code - Seat Motors Group 1 Common Circuit

Quick Answer

The Seat Memory Control Module controls the seat, lumbar, and adjustable pedal motors via half bridges that are connected to power rails internal to the module. Common causes include Faulty Seat, Lumbar, or Adjustable Pedal Motors, Seat, Lumbar, or Adjustable Pedal Motors harness is open or shorted, Seat, Lumbar, or Adjustable Pedal Motors circuit poor electrical connection. 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: B3920 2014 GMC Sierra indicates Seat Motors Group 1 Common Circuit.
Common causes: Common causes include Faulty Seat, Lumbar, or Adjustable Pedal Motors, Seat, Lumbar, or Adjustable Pedal Motors harness is open or shorted, Seat, Lumbar, or Adjustable Pedal Motors circuit poor electrical connection.
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.

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Code Popularity 211

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 16, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B3920 2014 GMC Sierra Description

The Seat Memory Control Module controls the seat, lumbar, and adjustable pedal motors via half bridges that are connected to power rails internal to the module. The Seat Memory Control Module connects all of the motor control circuits on each power rail to a common reference point whenever they are not in operation. The module monitors all seat motor control circuits for a shorted to ground or voltage before enabling any seat motor.
When a power seat, lumbar, or adjustable pedal switch is pressed or when a memory recall is requested, each seat motor receives battery voltage and ground from the seat memory control module via the motor control circuits. All motors are reversible, so the direction the motor rotates depends on which control circuit voltage is applied and which control circuit ground is applied. When the switch is operated in the opposite direction, the module reverses the polarity and applies voltage and ground to the opposite circuits to move the seat in the opposite direction.
The Diagnostic Trouble Code (DTC) sets when the voltage on any power rail 1 motor control circuit exceeds 2.78 volts for 100 ms or is below 1.47 volts for 100 ms.

OBDII Code B3920 2014 GMC Sierra - Seat Motors Group 1 Common Circuit - AutoCodes.com — B3920 2014 GMC Sierra Code - Seat Motors Group 1 Common Circuit

What does this mean?

What are the Possible Causes of the DTC B3920 2014 GMC Sierra?

Faulty Seat, Lumbar, or Adjustable Pedal Motors
Seat, Lumbar, or Adjustable Pedal Motors harness is open or shorted
Seat, Lumbar, or Adjustable Pedal Motors circuit poor electrical connection
Faulty Seat Memory Control Module

How to Fix the DTC B3920 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

B3920 01 Group 1 Seat Motors Circuit Shorted to Battery or Open
B3920 02 Group 1 Seat Motors Circuit Shorted to Ground

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3920 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 B3920 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- The common symptoms may include non-functional seat motors, inability to adjust the seat position, or erratic seat movement.

2. What are the possible causes of OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- The code B3920 may be triggered by issues such as a faulty seat motor, damaged wiring or connectors, or a malfunctioning control module.

3. How can I diagnose the OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- Diagnosis typically involves inspecting the seat motor connections, testing the wiring for continuity, and using a scan tool to check for fault codes in the control module.

4. What are some repair tips for fixing OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- Repair tips may include checking and repairing any damaged wiring, replacing a faulty seat motor, or resetting the control module after making necessary repairs.

5. Can I reset the OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit without fixing the underlying issue?

- While you can clear the code temporarily, it is recommended to address the root cause to prevent the issue from recurring and ensure proper functionality of the seat motors.

6. Is it possible to drive the vehicle with OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- It is not advisable to drive the vehicle with unresolved seat motor issues as it may affect driving comfort and safety. It's best to address the problem promptly.

7. How much does it typically cost to repair OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- The repair costs can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, wiring repairs, and labor charges from a mechanic.

8. Are there any preventive measures to avoid OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- Regularly inspecting the seat motors, keeping the wiring connections secure, and addressing any issues promptly can help prevent the occurrence of this OBDII code.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- Depending on the specific issue, some DIY repairs such as checking and repairing wiring connections may be possible, but more complex tasks may require professional assistance.

10. How long does it usually take to resolve OBDII code B3920 in a 2014 GMC Sierra related to the Seat Motors Group 1 Common Circuit?

- The repair time can vary based on the complexity of the issue and the availability of parts, but it may take a few hours to a day for a mechanic to diagnose and fix the problem.