B3806 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC B3806 2015 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 2015 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 2015 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 2015 GMC Sierra Code
1. What are the common symptoms of OBDII code B3806 in a 2015 GMC Sierra?
- Common symptoms include issues with the high beam headlights not functioning properly, difficulty switching between high and low beams, and the high beam indicator light staying on.
2. What are the potential causes of the High Beam and Headlamp Flash Select Circuit Malfunction (B3806) in a 2015 GMC Sierra?
- Possible causes may include a faulty headlamp flash switch, a malfunctioning high beam relay, wiring issues, or a problem with the high beam control module.
3. How can I diagnose the OBDII code B3806 in my 2015 GMC Sierra?
- You can diagnose this code by checking the high beam switch for proper operation, inspecting the wiring harness for any damage or loose connections, and testing the high beam relay and control module using a digital multimeter.
4. Can I continue driving my 2015 GMC Sierra with the B3806 trouble code?
- It is generally not recommended to continue driving with this code unresolved, as it can affect the proper functioning of your high beam headlights, compromising visibility and safety, especially at night.
5. How can I repair the High Beam and Headlamp Flash Select Circuit Malfunction in my 2015 GMC Sierra?
- Repair steps may include replacing the headlamp flash switch, repairing or replacing damaged wiring, checking and replacing the high beam relay if necessary, or addressing any issues with the high beam control module.
6. Are there any DIY tips for fixing the B3806 code in a 2015 GMC Sierra?
- DIY enthusiasts can start by inspecting the headlamp flash switch and wiring connections for any visible issues, but for more complex repairs involving the relay or control module, it may be best to consult a professional mechanic.
7. Is resetting the OBDII code B3806 enough to resolve the issue in a 2015 GMC Sierra?
- Simply resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the High Beam and Headlamp Flash Select Circuit Malfunction.
8. How much does it typically cost to repair the B3806 code in a 2015 GMC Sierra at a professional auto repair shop?
- The cost of repairs can vary depending on the exact cause of the issue and local labor rates, but it's advisable to budget for diagnostic fees, parts replacement costs, and labor charges.
9. Can extreme weather conditions contribute to triggering the B3806 trouble code in a 2015 GMC Sierra?
- Extreme weather conditions, such as exposure to moisture or extreme temperatures, can potentially lead to electrical issues that may trigger the High Beam and Headlamp Flash Select Circuit Malfunction code.
10. Will fixing the B3806 code affect the vehicle's overall performance or fuel efficiency in a 2015 GMC Sierra?
- Resolving the B3806 code is primarily about ensuring the proper operation of the high beam headlights and related circuits, so once fixed, it should not significantly impact the overall performance or fuel efficiency of the vehicle.
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