B3806 2017 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction
Quick Answer
The B3806 diagnostic trouble code (DTC) specifically pertains to a malfunction in the high beam and headlamp flash select circuit of the 2017 GMC Sierra. Common causes include Faulty headlight switch or lever that controls high beam and flash functions, Damaged or corroded wiring in the high beam circuit, Malfunctioning body control module (BCM) that fails to send the correct signals. 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 headlight switch or lever that controls high beam and flash functions, Damaged or corroded wiring in the high beam circuit, Malfunctioning body control module (BCM) that fails to send the correct signals.
- 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 B3806 2017 GMC Sierra Description
The B3806 diagnostic trouble code (DTC) specifically pertains to a malfunction in the high beam and headlamp flash select circuit of the 2017 GMC Sierra. This code indicates that the vehicle's onboard diagnostic system has detected an issue with the electrical circuit responsible for controlling the high beam headlights and the headlamp flash feature. When activated, these systems allow drivers to enhance visibility during nighttime driving or signal other drivers.
Common Causes of B3806 2017 GMC Sierra
- Faulty headlight switch or lever that controls high beam and flash functions.
- Damaged or corroded wiring in the high beam circuit.
- Malfunctioning body control module (BCM) that fails to send the correct signals.
- Poor electrical connections or short circuits within the headlamp system.
- Blown fuses related to the headlamp circuit.
Symptoms of B3806 2017 GMC Sierra
- High beams do not activate when the switch is engaged.
- Headlamp flash feature fails to operate.
- Flickering or intermittent operation of high beams.
- Dashboard warning lights may illuminate, indicating a lighting system fault.
- Inconsistent operation of low beam headlights, potentially linked to the high beam circuit malfunction.
How to Fix B3806 2017 GMC Sierra
- Diagnostic Testing: Begin by using a scan tool to confirm the presence of the B3806 code and check for any other related codes that may provide additional context.
- Visual Inspection: Inspect the headlight switch, wiring harness, and connectors for any visible damage, corrosion, or loose connections.
- Component Testing: Test the headlight switch and BCM to ensure they are functioning correctly. This may involve using a multimeter to check for continuity and proper voltage.
- Repair or Replace: If any components are found to be faulty, repair or replace them as necessary. This may include replacing the headlight switch, repairing damaged wiring, or replacing the BCM.
- Clear Codes and Test Drive: After repairs, clear the diagnostic codes and perform a test drive to ensure that the high beam and headlamp flash functions are operating correctly.
Cost to Fix B3806 2017 GMC Sierra
The typical repair costs for addressing a B3806 code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $150 and $600, which includes parts and labor. Labor rates can differ significantly depending on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate. Additionally, if the issue is related to the BCM, the cost could be on the higher end due to the complexity of the component.
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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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