B3920 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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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Information for Specific Chevrolet Models
- B3920 2014 Chevrolet Silverado — Seat Motors Group 1 Common Circuit
- B3920 2015 Chevrolet Silverado — Seat Motors Group 1 Common Circuit
- B3920 2016 Chevrolet Silverado — Seat Motors Group 1 Common Circuit
- B3920 2017 Chevrolet Silverado — Seat Motors Group 1 Common Circuit
- B3920 2018 Chevrolet Silverado — Seat Motors Group 1 Common Circuit
Frequently Asked Questions about B3920 Chevrolet Code
1. What does the OBDII code B3920 mean on a Chevrolet?
B3920 indicates a fault in the Seat Motors Group 1 Common Circuit, which typically relates to an issue with the power seat motor or its associated wiring.
2. What are the common symptoms of the B3920 code in a Chevrolet?
Symptoms may include power seats not moving, limited seat adjustment functionality, or intermittent operation of the seat motors.
3. What causes the B3920 code to appear in a Chevrolet?
The code can be triggered by a faulty seat motor, damaged wiring or connectors, a blown fuse, or an issue with the seat control module.
4. How can I diagnose the B3920 code on my Chevrolet?
Start by checking the seat motor wiring and connectors for damage or corrosion, test the seat motors, and use a scan tool to verify the fault in the seat control module.
5. Can the B3920 code be caused by a dead battery?
A dead or weak battery is unlikely to directly cause this code, but low voltage can affect seat motor operation and trigger related issues.
6. Is it safe to drive with the B3920 code active?
Yes, it is generally safe to drive; however, the seat adjustment functions may be limited or non-operational, affecting comfort or driving ergonomics.
7. How do I fix the B3920 code on a Chevrolet?
Repairs may include replacing the seat motor, repairing damaged wiring, cleaning corroded connectors, or reprogramming the seat control module if necessary.
8. Can I reset the B3920 code without repairs?
Clearing the code with a scan tool may temporarily remove it, but if the underlying issue is not resolved, the code is likely to return.
9. How much does it cost to fix the B3920 code in a Chevrolet?
Repair costs vary but generally range from $100 to $500, depending on whether the issue is a simple wiring repair or requires seat motor or module replacement.
10. Can a faulty seat control module cause the B3920 code?
Yes, a malfunctioning seat control module can fail to properly control the seat motor circuits and trigger the B3920 code.
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