B3806 2017 GMC Sierra 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 2017 GMC Sierra 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 2017 GMC Sierra Description
What are the Possible Causes of the DTC B3806 2017 GMC Sierra?
- 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 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3806 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 B3806 2017 GMC Sierra Code
1. What does the OBDII code B3806 mean on a 2017 GMC Sierra?
B3806 indicates a malfunction in the high beam and headlamp flash select circuit, which controls the vehicle's ability to switch between high beams and flash-to-pass functions.
2. What are the common symptoms of the B3806 code?
Symptoms include high beams not turning on, the flash-to-pass function not working, or the high beam indicator light on the dashboard not illuminating.
3. What causes the B3806 code to appear?
Common causes include a faulty multifunction switch, damaged wiring or connectors in the high beam circuit, or a malfunctioning body control module (BCM).
4. How can I diagnose the B3806 code on my GMC Sierra?
Inspect the multifunction switch, check the wiring and connectors for damage or corrosion, and use a diagnostic scanner to verify the code and monitor the BCM inputs and outputs.
5. Can I still drive my GMC Sierra with the B3806 code?
Yes, but the inability to use high beams or the flash-to-pass function can reduce visibility and safety during nighttime or low-light driving conditions.
6. How much does it cost to repair the B3806 code?
Repair costs can vary depending on the issue, ranging from $50 for a simple wiring fix to $300 or more if the multifunction switch or BCM needs replacement.
7. Can a blown fuse cause the B3806 code?
Yes, a blown fuse in the high beam circuit can interrupt the electrical flow and trigger the B3806 code.
8. How do I reset the B3806 code after making repairs?
Use an OBDII scanner to clear the code after verifying that the issue has been resolved. If the problem persists, the code may reappear.
9. What tools are needed to fix the B3806 code?
You may need a multimeter to check wiring continuity, an OBDII scanner for diagnostics, and basic tools to access and inspect the multifunction switch and wiring.
10. What should I do if the B3806 code keeps coming back?
If the code persists, recheck all wiring and connections, ensure the multifunction switch is correctly installed, and consider having the BCM tested by a professional technician.
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