AutoCodes – Chevrolet – B3806 Chevrolet

B3806 Chevrolet 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 Chevrolet 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 4,010

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

What does this mean?

What are the Possible Causes of the DTC B3806 Chevrolet?

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 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3806 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.

Need more information about the B3806 Chevrolet code?

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

Need Help with the Code?

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

Information for Specific Chevrolet Models

B3806 2014 Chevrolet Silverado — High Beam and Headlamp Flash Select Circuit Malfunction
B3806 2015 Chevrolet Silverado — High Beam and Headlamp Flash Select Circuit Malfunction
B3806 2016 Chevrolet Silverado — High Beam and Headlamp Flash Select Circuit Malfunction
B3806 2017 Chevrolet Silverado — High Beam and Headlamp Flash Select Circuit Malfunction
B3806 2018 Chevrolet Silverado — High Beam and Headlamp Flash Select Circuit Malfunction

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 Chevrolet Code

1. What are the common symptoms of OBDII code B3806 in a Chevrolet related to the High Beam and Headlamp Flash Select Circuit Malfunction?

- Common symptoms include issues with the high beam headlights, malfunctioning headlamp flash select feature, and possibly a warning light on the dashboard.

2. What are the possible causes of OBDII code B3806 in a Chevrolet?

- Possible causes include a faulty high beam switch, damaged wiring or connectors in the headlamp circuit, or a malfunctioning headlamp flash select module.

3. How can I diagnose the High Beam and Headlamp Flash Select Circuit Malfunction in my Chevrolet when OBDII code B3806 is triggered?

- Diagnosis typically involves checking the high beam switch operation, inspecting the wiring and connectors in the headlamp circuit, and testing the headlamp flash select module for proper function.

4. Can I still drive my Chevrolet with OBDII code B3806 present?

- It is generally safe to drive with this code, but it is important to address the underlying issue promptly to ensure proper headlight functionality.

5. How can I repair OBDII code B3806 in my Chevrolet?

- Repair may involve replacing the high beam switch, repairing damaged wiring or connectors, or replacing the headlamp flash select module as needed.

6. Is it possible for a blown fuse to cause OBDII code B3806 in a Chevrolet?

- Yes, a blown fuse in the headlamp circuit can cause the High Beam and Headlamp Flash Select Circuit Malfunction and trigger code B3806.

7. Are there any DIY tips for troubleshooting OBDII code B3806 in a Chevrolet?

- DIY tips include visually inspecting the headlamp circuit for any visible damage, checking the high beam switch for proper operation, and testing the headlamp flash select module.

8. How do I reset the OBDII code B3806 in my Chevrolet after repairing the issue?

- The code can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the fault codes.

9. Can extreme weather conditions affect the High Beam and Headlamp Flash Select Circuit Malfunction in a Chevrolet?

- Yes, extreme weather conditions such as heavy rain or snow can potentially cause electrical issues in the headlamp circuit, leading to this malfunction.

10. Is it necessary to visit a mechanic for OBDII code B3806 repair, or can I fix it myself?

- Depending on your automotive repair skills and tools, you may be able to fix the issue yourself. However, if you are unsure or uncomfortable with electrical repairs, it is recommended to seek professional help.