B3920 2017 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado?
- 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 Chevrolet Silverado?
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 Chevrolet Silverado 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 Chevrolet Silverado Code
1. What does the OBDII code B3920 mean on a 2017 Chevrolet Silverado?
The code B3920 indicates an issue with the Seat Motors Group 1 Common Circuit, often related to the wiring or components controlling seat motor functionality.
2. What are the common symptoms of the B3920 code in a 2017 Silverado?
Common symptoms include the driver's or passenger's seat not adjusting, limited seat movement, or unresponsive seat controls.
3. What causes the B3920 code in a Chevrolet Silverado?
This code can be caused by faulty seat motors, damaged wiring, loose or corroded connectors, or a malfunctioning seat control module.
4. Can a blown fuse trigger the B3920 code?
Yes, a blown fuse in the seat motor circuit can cause this code to appear by interrupting power to the seat adjustment system.
5. How can I diagnose the B3920 code on my Silverado?
Diagnose the code by visually inspecting the wiring and connectors for damage, checking for blown fuses, and using a scan tool to test the seat control module and motor circuits.
6. Is the B3920 code a serious issue?
While not critical to vehicle operation, it can be inconvenient as it affects seat adjustability and may indicate electrical problems that could worsen if not addressed.
7. How do I fix the B3920 code in my 2017 Silverado?
Repairs may include replacing faulty seat motors, repairing or replacing damaged wiring or connectors, and resetting the seat control module if necessary.
8. Can I still drive my Silverado with the B3920 code?
Yes, the truck can still be driven, but seat adjustment features may not work properly, which could impact comfort or safety.
9. Will clearing the code fix the problem permanently?
Clearing the code without addressing the root cause will not fix the issue; the code will likely reappear until repairs are made.
10. Should I take my Silverado to a mechanic for a B3920 code?
If you’re not comfortable diagnosing electrical systems, it’s best to take your vehicle to a qualified mechanic to identify and fix the issue.
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