B3920 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra Code
1. What does the OBDII code B3920 mean on a 2017 GMC Sierra?
B3920 indicates a problem with the Seat Motors Group 1 Common Circuit, which relates to the wiring or control of the seat adjustment motors.
2. What are the common symptoms of code B3920 in a 2017 GMC Sierra?
Symptoms include the seat adjustment motor not functioning, slow or uneven seat movement, or intermittent operation.
3. What causes the B3920 code to appear in a 2017 GMC Sierra?
Common causes include damaged wiring, a faulty seat motor, a malfunctioning seat control switch, or a poor ground connection in the circuit.
4. How is code B3920 diagnosed?
A technician will inspect the wiring, test the seat motor and control switch, and check for continuity or shorts in the circuit.
5. Can I still drive my 2017 GMC Sierra with a B3920 code?
Yes, the vehicle is safe to drive, but the seat adjustment functionality may be limited or inoperative.
6. How do I fix the B3920 code on a 2017 GMC Sierra?
Repairs may involve replacing damaged wiring, repairing a poor ground connection, or replacing a faulty seat motor or control switch.
7. How much does it cost to fix the B3920 code on a 2017 GMC Sierra?
Costs vary depending on the exact repair. Wiring repairs can cost $100-$300, while seat motor replacement may cost $400-$700.
8. Can I reset the B3920 code without repairing the issue?
You can clear the code with an OBDII scanner, but if the underlying issue isn’t resolved, the code will likely return.
9. What tools do I need to troubleshoot the B3920 code?
You’ll need an OBDII scanner, a multimeter for testing voltage and continuity, and possibly wiring diagrams for the seat motor circuit.
10. Does the B3920 code affect other vehicle systems?
No, this code is specific to the seat motor circuit and doesn’t affect other vehicle systems.
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