B3806 Code - High Beam and Headlamp Flash Select Circuit Malfunction
Quick Answer
When the turn signal/multifunction switch is momentarily placed in the flash-to-pass position, ground is applied to the Body Control Module (BCM) through the flash-to-pass signal circuit. Common causes include Faulty Turn Signal/Multifunction Switch, Turn Signal/Multifunction Switch harness is open or shorted, Turn Signal/Multifunction Switch 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
- B3806 indicates High Beam and Headlamp Flash Select Circuit Malfunction.
- Common causes
- Common causes include Faulty Turn Signal/Multifunction Switch, Turn Signal/Multifunction Switch harness is open or shorted, Turn Signal/Multifunction Switch 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 B3806 Description
What are the Possible Causes of the DTC B3806?
- Faulty Turn Signal/Multifunction Switch
- Turn Signal/Multifunction Switch harness is open or shorted
- Turn Signal/Multifunction Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B3806?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3806 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 Makes
- B3806 Buick — High Beam and Headlamp Flash Select Circuit Malfunction
- B3806 Cadillac — High Beam and Headlamp Flash Select Circuit Malfunction
- B3806 Chevrolet — High Beam and Headlamp Flash Select Circuit Malfunction
- B3806 GMC — High Beam and Headlamp Flash Select Circuit Malfunction
Frequently Asked Questions about B3806 Code
1. What does the OBDII code B3806 mean?
The B3806 code indicates a malfunction in the high beam and headlamp flash select circuit, which controls the vehicle's high beam and flashing functions.
2. What are the common symptoms of the B3806 code?
Symptoms include high beams not turning on, the headlamp flash function not working, or intermittent operation of the high beam lights.
3. What causes the B3806 code to appear?
Common causes include a faulty high beam switch, damaged wiring in the headlamp circuit, a blown fuse, or a malfunctioning body control module (BCM).
4. Can I still drive my car with the B3806 code?
Yes, but you may experience limited visibility at night or in low-light conditions if the high beams are not functioning properly.
5. How is the B3806 code diagnosed?
Technicians typically inspect the high beam switch, check for damaged wiring or connectors, and test the circuit for continuity and proper voltage.
6. What repairs can fix the B3806 code?
Repairs may involve replacing the high beam switch, repairing or replacing damaged wiring, replacing a blown fuse, or reprogramming or replacing the BCM.
7. How much does it cost to fix the B3806 code?
The cost depends on the root cause, ranging from $50 for a simple wiring repair to $500 or more if the BCM needs replacement.
8. Can I fix the B3806 code myself?
If you're comfortable with basic electrical testing and repairs, you may be able to fix issues like blown fuses or damaged wiring. Complex issues, like BCM faults, should be handled by a professional.
9. What tools are needed to diagnose the B3806 code?
You’ll need an OBDII scanner, a multimeter to test electrical circuits, and potentially wiring diagrams for your vehicle.
10. How can I prevent the B3806 code from reoccurring?
Regularly inspect your vehicle's electrical connections and wiring for damage, and address any issues with the high beam switch or BCM promptly.
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