AutoCodes – GMC – B3650 2017 GMC Sierra

B3650 2017 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 2017 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.

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Code Popularity 196

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 B3650 2017 GMC Sierra Description

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. The BCM responds to the high beam 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 Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the turn signal/multifunction switch high beam signal circuit.

OBDII Code B3650 2017 GMC Sierra - High Beam Request Signal Circuit Performance Signal Invalid - AutoCodes.com — B3650 2017 GMC Sierra Code - High Beam Request Signal Circuit Performance Signal Invalid

What does this mean?

What are the Possible Causes of the DTC B3650 2017 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 2017 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 2017 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 B3650 2017 GMC Sierra code?

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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 2017 GMC Sierra Code

What does the OBDII code B3650 mean on a 2017 GMC Sierra?

Code B3650 refers to an issue with the High Beam Request Signal Circuit, indicating that the signal performance is invalid or not functioning as expected.

What are the symptoms of code B3650 on a 2017 GMC Sierra?

Symptoms may include high beams not activating, high beams staying on unexpectedly, or a malfunction indicator light (MIL) on the dashboard.

What causes the code B3650 to appear on a 2017 GMC Sierra?

Common causes include a faulty high beam switch, damaged wiring or connectors in the high beam circuit, or a problem with the body control module (BCM).

How can I diagnose code B3650 on my 2017 GMC Sierra?

Start by inspecting the high beam switch and its connections for damage, check the wiring for shorts or corrosion, and use a scan tool to monitor the high beam request signal.

Can a bad body control module (BCM) cause code B3650?

Yes, a malfunctioning BCM can cause this code if it cannot properly interpret or process the high beam request signal.

How do I fix code B3650 on a 2017 GMC Sierra?

Repairs may involve replacing the high beam switch, repairing or replacing damaged wiring, or reprogramming or replacing the BCM if necessary.

Is code B3650 a serious issue for my 2017 GMC Sierra?

While it may not affect drivability, this code can impair the functionality of your high beams, which is a safety issue when driving at night or in poor visibility.

Can I drive my 2017 GMC Sierra with code B3650?

You can drive the vehicle, but avoid driving at night or in low-visibility conditions until the high beam issue is resolved.

How much does it cost to fix code B3650 on a 2017 GMC Sierra?

Repair costs vary depending on the root cause. Replacing a high beam switch may cost $100-$200, while BCM replacement or reprogramming can cost $300-$800.

Will clearing the code B3650 solve the problem?

Clearing the code may turn off the warning temporarily, but the underlying issue must be repaired to prevent the code from returning.