AutoCodes – Chevrolet – B3806 2015 Chevrolet Silverado

B3806 2015 Chevrolet Silverado 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 Chevrolet Silverado 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.

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Code Popularity 163

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3806 2015 Chevrolet Silverado Description

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. The BCM responds to the flash-to-pass request by applying ground to the high-beam relay control circuit which energizes the high-beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuses to the high beam control circuits illuminating the high beam headlamps. The high beam headlamps will only illuminate for as long as the flash-to-pass switch is activated. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the turn signal/multifunction switch flash to pass signal circuit.

OBDII Code B3806 2015 Chevrolet Silverado - High Beam and Headlamp Flash Select Circuit Malfunction - AutoCodes.com — B3806 2015 Chevrolet Silverado Code - High Beam and Headlamp Flash Select Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B3806 2015 Chevrolet Silverado?

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 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3806 2015 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 B3806 2015 Chevrolet Silverado code?

Need more information on how to fix the B3806 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3806 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B3806 2015 Chevrolet Silverado Code

1. What does the OBDII code B3806 mean on a 2015 Chevrolet Silverado?

It indicates a malfunction in the high beam and headlamp flash select circuit, suggesting an issue with the control or wiring of the high beam system.

2. What are common symptoms of code B3806 in a 2015 Chevrolet Silverado?

Common symptoms include the high beams not activating, the headlamp flash feature not functioning, or an illuminated check engine or warning light.

3. What causes the B3806 code on a 2015 Chevrolet Silverado?

Possible causes include a faulty high beam switch, damaged or corroded wiring, a blown fuse, or a malfunctioning body control module (BCM).

4. How do I diagnose the B3806 code on my Silverado?

Start by checking the high beam switch and wiring for damage or loose connections. Use a scan tool to verify the code and test the circuit components.

5. Can a blown fuse cause the B3806 code to appear?

Yes, a blown fuse in the headlamp circuit can interrupt power and trigger this code.

6. Is the body control module (BCM) likely to fail and cause the B3806 code?

While less common, a malfunctioning BCM can cause this code if it fails to properly control the high beam circuit.

7. How can I fix the B3806 code on my 2015 Chevrolet Silverado?

Repairs may include replacing a faulty high beam switch, repairing damaged wiring, replacing a blown fuse, or reprogramming or replacing the BCM.

8. How much does it cost to repair the B3806 code on a Silverado?

The cost depends on the root cause. Replacing a switch or fuse may cost $50â€“$150, while BCM repairs can exceed $500 including parts and labor.

9. Can I still drive my 2015 Silverado with the B3806 code?

It's possible, but not recommended as it may impair your ability to use high beams, which are crucial for safe driving at night or in low visibility.

10. Do I need professional help to fix the B3806 code?

If basic troubleshooting like inspecting fuses and wiring doesnâ€™t resolve the issue, consulting a professional mechanic is advised to diagnose and repair the circuit.