B3650 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC B3650 GMC?
- 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 GMC?
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 GMC 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 B3650 GMC code?
Need more information on how to fix the B3650 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B3650 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- B3650 2014 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
- B3650 2015 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
- B3650 2016 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
- B3650 2017 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
- B3650 2018 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
Frequently Asked Questions about B3650 GMC Code
1. What does the OBDII code B3650 on a GMC mean?
The B3650 code indicates an issue with the High Beam Request Signal Circuit, where the signal is deemed invalid by the vehicle's control module.
2. What are the common symptoms of a B3650 code on a GMC?
Symptoms may include high beams not functioning, the high beam indicator on the dashboard not illuminating, or intermittent high beam operation.
3. What causes the B3650 code to appear on a GMC vehicle?
Common causes include 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 cause the B3650 code on a GMC?
Yes, a blown fuse in the high beam circuit can disrupt the signal and trigger this code.
5. How can I diagnose the B3650 code on my GMC?
Start by inspecting the high beam switch, checking for damaged or corroded wiring, and testing the functionality of the circuit with a multimeter. If no issues are found, the BCM may need further evaluation.
6. Is the high beam switch the most common cause of the B3650 code?
Yes, a faulty or stuck high beam switch is one of the most common causes of this code.
7. Can I still drive my GMC with the B3650 code active?
Yes, you can drive the vehicle, but your high beams may not work properly, which could affect nighttime visibility and safety.
8. How do I fix the B3650 code on my GMC?
Repairs may include replacing the high beam switch, repairing or replacing damaged wiring, or reprogramming or replacing the body control module if necessary.
9. How much does it cost to repair a B3650 code on a GMC?
Repair costs vary depending on the cause but typically range from $50 to $300, including parts and labor, with BCM replacement being on the higher end.
10. Do I need to clear the code after fixing the issue?
Yes, after repairs, use an OBDII scanner to clear the code and confirm the fix by checking if the code reappears.
Discuss the causes and fixes for B3650 GMC OBDII Code
Code B3650 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
