B3920 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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.
Need more information about the B3920 2018 Chevrolet Silverado code?
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Frequently Asked Questions about B3920 2018 Chevrolet Silverado Code
1. What does the OBDII code B3920 mean on a 2018 Chevrolet Silverado?
The B3920 code refers to a fault in the Seat Motors Group 1 Common Circuit, which typically involves an issue with the wiring, motor, or control related to the power seat system.
2. What are the common symptoms of code B3920 in a 2018 Chevrolet Silverado?
Common symptoms include the power seat not moving in one or more directions, intermittent seat operation, or complete failure of the seat motor.
3. What causes the B3920 code to appear on a 2018 Chevrolet Silverado?
Causes may include damaged wiring, a faulty seat motor, a malfunctioning seat control module, or a poor ground connection in the seat motor circuit.
4. Can I still drive my 2018 Chevrolet Silverado with the B3920 code active?
Yes, you can still drive the vehicle, but the power seat functionality may be limited or inoperative, which could affect comfort and proper seating adjustment.
5. How do I diagnose the B3920 code on my 2018 Chevrolet Silverado?
Diagnosis involves checking the wiring and connectors for damage, testing the seat motor for proper operation, and verifying the functionality of the seat control module.
6. How do I fix the B3920 code in a 2018 Chevrolet Silverado?
Repairs may include replacing damaged wires, repairing or replacing the seat motor, or reprogramming or replacing the seat control module if necessary.
7. Is the B3920 code a common issue in the 2018 Chevrolet Silverado?
It’s not extremely common but can occur, especially if the seat system experiences wear and tear or electrical issues over time.
8. How much does it cost to repair the B3920 code in a 2018 Chevrolet Silverado?
Repair costs vary depending on the issue, ranging from $50 to $150 for minor wiring fixes to $500 or more if the seat motor or control module requires replacement.
9. Can I clear the B3920 code without fixing the problem?
Clearing the code without addressing the underlying issue will likely result in the code returning, as the root cause remains unresolved.
10. Do I need professional help to fix the B3920 code in my 2018 Chevrolet Silverado?
While some issues like inspecting connectors and wires can be done at home, more complex repairs like motor or module replacement may require professional expertise.
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