B3920 2016 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 2016 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.
Code B3920 2016 GMC Sierra Description
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.
What are the Possible Causes of the DTC B3920 2016 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 2016 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.
Code Tech Notes
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 2016 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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Frequently Asked Questions about B3920 2016 GMC Sierra Code
1. What does the OBDII code B3920 mean on a 2016 GMC Sierra?
The B3920 code indicates an issue with the Seat Motors Group 1 Common Circuit, typically related to the power seat motor or its control circuit.
2. What are common symptoms of code B3920 in a 2016 GMC Sierra?
Symptoms may include the power seat not moving, moving erratically, or stopping unexpectedly during adjustment.
3. What causes the B3920 code to appear?
Common causes include a faulty seat motor, damaged wiring or connectors, a malfunctioning seat control module, or a blown fuse.
4. How can I diagnose the B3920 code on my GMC Sierra?
Start by checking the power seat fuse, inspecting the wiring and connectors for damage, and testing the seat motor and control module for proper operation.
5. Can I still drive my 2016 GMC Sierra with the B3920 code active?
Yes, the vehicle is drivable, but the power seat adjustment may not work, which can affect driver comfort and proper seating position.
6. How do I fix the B3920 code on my GMC Sierra?
Repairs may include replacing a faulty seat motor, repairing damaged wiring, cleaning or reconnecting loose connectors, or replacing the seat control module.
7. How much does it typically cost to fix code B3920?
Repair costs vary but can range from $100 to $500, depending on whether the issue is with wiring, the motor, or the seat control module.
8. Can a blown fuse cause the B3920 code?
Yes, a blown fuse in the power seat circuit can trigger this code and should be checked first.
9. Is it safe to clear the B3920 code without repairs?
Clearing the code without addressing the underlying issue may result in the problem recurring and continued seat adjustment issues.
10. Can I repair the B3920 issue myself on a 2016 GMC Sierra?
If you’re comfortable working with vehicle electronics, you can inspect and repair wiring or replace components, but complex issues may require professional assistance.
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