AutoCodes – GMC – B3806 2016 GMC Sierra

B3806 2016 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 2016 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.

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Code Popularity 198

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 2016 GMC Sierra 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 2016 GMC Sierra - High Beam and Headlamp Flash Select Circuit Malfunction - AutoCodes.com — B3806 2016 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B3806 2016 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 2016 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 2016 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.

Need more information about the B3806 2016 GMC Sierra code?

Need more information on how to fix the B3806 2016 GMC Sierra code? Get Access to Factory Service Manuals

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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 2016 GMC Sierra Code

1. What does OBDII code B3806 mean for a 2016 GMC Sierra?

The code B3806 indicates a High Beam and Headlamp Flash Select Circuit Malfunction in the vehicle.

2. What are the common symptoms of OBDII code B3806 in a 2016 GMC Sierra?

Common symptoms include issues with the operation of the high beams and headlamp flash select function, such as non-functioning or erratic behavior.

3. What are the possible causes of OBDII code B3806 in a 2016 GMC Sierra?

Causes of this code may include faulty wiring or connections in the high beam and headlamp flash select circuit, a malfunctioning headlamp flash switch, or a problem with the control module.

4. How can I diagnose OBDII code B3806 in my 2016 GMC Sierra?

To diagnose this code, you may need to perform a thorough inspection of the high beam and headlamp flash circuit, check for wiring issues, test the headlamp flash switch, and use a diagnostic scan tool to gather more information.

5. Can I drive my 2016 GMC Sierra with OBDII code B3806?

It is not recommended to drive the vehicle with unresolved OBDII code B3806, as it may affect the proper functioning of the high beams and headlamp flash select feature, potentially compromising visibility and safety.

6. How can I repair OBDII code B3806 in my 2016 GMC Sierra?

Repairing this code may involve addressing any wiring issues, replacing a faulty headlamp flash switch, or repairing the control module as needed. It is recommended to consult a qualified mechanic for proper diagnosis and repair.

7. Is OBDII code B3806 a serious issue in a 2016 GMC Sierra?

While the code itself may not pose an immediate safety risk, it is important to address it promptly to ensure the proper functioning of the high beam and headlamp flash select system for optimal visibility and safety while driving.

8. Can a DIY enthusiast fix OBDII code B3806 in a 2016 GMC Sierra?

Depending on the root cause of the issue, some DIY enthusiasts with experience in automotive electrical systems may be able to diagnose and repair OBDII code B3806. However, complex issues may require professional assistance.

9. How much does it cost to repair OBDII code B3806 in a 2016 GMC Sierra?

Repair costs for OBDII code B3806 can vary depending on the underlying cause of the issue, labor rates, and the cost of any replacement parts needed. It is advisable to obtain quotes from multiple mechanics for an accurate estimate.

10. Can OBDII code B3806 be reset in a 2016 GMC Sierra after repair?

Once the underlying issue causing OBDII code B3806 has been addressed and repaired, the code can be cleared using a diagnostic scan tool to reset the system in a 2016 GMC Sierra.