B3650 2016 GMC Sierra Code - High Beam Request Signal Circuit Performance Signal Invalid
Quick Answer
When the low beam headlamps are on and the turn signal/multifunction switch is placed in the high beam position, ground is applied to the Body Control Module (BCM) through the high beam 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
- B3650 2016 GMC Sierra indicates High Beam Request Signal Circuit Performance Signal Invalid.
- 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 B3650 2016 GMC Sierra Description
What are the Possible Causes of the DTC B3650 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 B3650 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 B3650 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.
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Frequently Asked Questions about B3650 2016 GMC Sierra Code
1. What does OBDII code B3650 mean on a 2016 GMC Sierra?
Code B3650 indicates an issue with the high beam request signal circuit, where the performance or signal is deemed invalid by the vehicle's control module.
2. What are the common symptoms of code B3650 in a 2016 GMC Sierra?
Common symptoms include malfunctioning high beams, inability to switch between high and low beams, or the high beam indicator light not working properly.
3. What causes the B3650 code to appear in a 2016 GMC Sierra?
The code can be caused by a faulty high beam switch, damaged wiring or connectors in the high beam circuit, or a malfunctioning Body Control Module (BCM).
4. Can a blown fuse trigger the B3650 code on a 2016 GMC Sierra?
Yes, a blown fuse in the high beam circuit can prevent proper signal transmission and cause the B3650 code to set.
5. How do you diagnose the B3650 code on a 2016 GMC Sierra?
Start by inspecting the high beam switch, wiring, and connectors for damage or corrosion. Use a scan tool to monitor the high beam request signal and verify its performance.
6. Can the B3650 code cause other electrical issues in the vehicle?
It typically affects only the high beam circuit, but if the BCM is faulty, other related electrical systems could also be impacted.
7. How can the B3650 code be fixed in a 2016 GMC Sierra?
Repairs may involve replacing a faulty high beam switch, repairing or replacing damaged wiring, or reprogramming or replacing the BCM if necessary.
8. Is it safe to drive a 2016 GMC Sierra with the B3650 code?
While the vehicle may still be drivable, reduced functionality of the high beams can compromise visibility and safety, especially when driving at night.
9. Can a weak battery cause the B3650 code in a 2016 GMC Sierra?
A weak or failing battery can sometimes cause voltage irregularities that may contribute to circuit performance issues, though it is not a common cause for this specific code.
10. Does the B3650 code require professional repair for a 2016 GMC Sierra?
If the issue is related to complex wiring or BCM programming, professional diagnosis and repair are recommended, though simpler fixes like replacing a fuse or switch can be done by experienced DIYers.
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