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B3650 2016 GMC Sierra Code - High Beam Request Signal Circuit Performance Signal Invalid

Quick Answer

The diagnostic trouble code B3650 for a 2016 GMC Sierra indicates a problem with the High Beam Request Signal Circuit Performance Signal being invalid. Common causes include Faulty wiring or connections in the high beam request signal circuit, Malfunctioning headlight switch, Defective body control module (BCM). 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 wiring or connections in the high beam request signal circuit, Malfunctioning headlight switch, Defective body control module (BCM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code B3650 2016 GMC Sierra Description

The diagnostic trouble code B3650 for a 2016 GMC Sierra indicates a problem with the High Beam Request Signal Circuit Performance Signal being invalid. This code is typically triggered when the vehicle's onboard computer detects an issue with the high beam request signal circuit, which controls the activation of the high beam headlights. The high beam request signal circuit is responsible for sending a signal from the headlight switch to the vehicle's body control module (BCM) to turn on the high beams when requested by the driver. When this signal is deemed invalid, it means that there is a malfunction in the circuit that is preventing the high beams from functioning properly.

OBDII Code B3650 2016 GMC Sierra - High Beam Request Signal Circuit Performance Signal Invalid
B3650 2016 GMC Sierra Code - High Beam Request Signal Circuit Performance Signal Invalid

Common Causes of B3650 2016 GMC Sierra

  1. Faulty wiring or connections in the high beam request signal circuit.
  2. Malfunctioning headlight switch.
  3. Defective body control module (BCM).
  4. Problem with the high beam relay.
  5. Corrosion or damage to components in the high beam circuit.

Symptoms of B3650 2016 GMC Sierra

  1. High beam headlights not turning on when requested.
  2. Dim or flickering high beam headlights.
  3. High beam indicator light on the dashboard staying on or flashing.
  4. Inconsistent high beam operation.
  5. Vehicle failing a state inspection due to high beam functionality issues.

How to Fix B3650 2016 GMC Sierra

  1. Begin by conducting a visual inspection of the high beam request signal circuit, checking for any loose or damaged wiring or connections.
  2. Test the headlight switch to determine if it is functioning correctly and sending the high beam request signal to the BCM.
  3. Use a multimeter to test the continuity of the high beam relay and replace it if necessary.
  4. Inspect the BCM for any signs of damage or malfunction, and replace it if it is found to be the cause of the issue.
  5. Clear the diagnostic trouble code from the vehicle's onboard computer and test the high beam headlights to ensure they are operating properly.

Cost to Fix B3650 2016 GMC Sierra

The typical repair costs for addressing a High Beam Request Signal Circuit Performance Signal Invalid code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, parts and labor for this type of repair could range from $100 to $500. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local shops for a more accurate estimate of the total cost.

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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 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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