AutoCodes – Chevrolet – B3596 Chevrolet

B3596 Chevrolet Code - Hazard Lamps Request Circuit Malfunction

Quick Answer

The hazard flashers may be activated in any power mode. 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: B3596 Chevrolet indicates Hazard Lamps Request Circuit Malfunction.
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 2,975

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 13, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B3596 Chevrolet Description

The hazard flashers may be activated in any power mode. The hazard warning switch signal circuit is momentarily grounded when the hazard warning switch is pressed. The Body Control Module (BCM) responds to the hazard warning switch signal input by supplying battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard warning switch is activated, the BCM sends a serial data message to the instrument cluster requesting both turn signal indicators to be cycled ON and OFF. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the hazard warning switch signal circuit.

OBDII Code B3596 Chevrolet - Hazard Lamps Request Circuit Malfunction - AutoCodes.com — B3596 Chevrolet Code - Hazard Lamps Request Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B3596 Chevrolet?

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 B3596 Chevrolet?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3596 Chevrolet 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 B3596 Chevrolet code?

Need more information on how to fix the B3596 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3596 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B3596 2014 Chevrolet Silverado — Hazard Lamps Request Circuit Malfunction
B3596 2015 Chevrolet Silverado — Hazard Lamps Request Circuit Malfunction
B3596 2016 Chevrolet Silverado — Hazard Lamps Request Circuit Malfunction
B3596 2017 Chevrolet Silverado — Hazard Lamps Request Circuit Malfunction
B3596 2018 Chevrolet Silverado — Hazard Lamps Request Circuit Malfunction

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 B3596 Chevrolet Code

1. What does the OBDII code B3596 mean in a Chevrolet?

B3596 indicates a malfunction in the Hazard Lamps Request Circuit, which is responsible for activating the vehicle's hazard lights.

2. What are the common symptoms of code B3596 in a Chevrolet?

The most common symptoms include hazard lights not functioning, hazard switch not responding, or hazard lights activating unexpectedly.

3. What causes the B3596 code to appear in a Chevrolet?

The code can be caused by a faulty hazard light switch, damaged wiring or connectors in the hazard lamp circuit, or a malfunctioning body control module (BCM).

4. Can a blown fuse cause the B3596 code in a Chevrolet?

Yes, a blown fuse related to the hazard lamp circuit can interrupt functionality and trigger the B3596 code.

5. How do you diagnose the B3596 code in a Chevrolet?

Diagnosing involves inspecting the hazard light switch, checking for damaged wiring or loose connections, and using a scan tool to verify BCM functionality.

6. Can I drive my Chevrolet with the B3596 code active?

While the vehicle may still be drivable, the hazard lights may not function properly, which can be a safety issue in emergency situations.

7. How do you fix the B3596 code in a Chevrolet?

Repairs may include replacing the hazard light switch, repairing damaged wiring, reconnecting loose connectors, or reprogramming/replacing the BCM.

8. Is a BCM replacement always required for the B3596 code in a Chevrolet?

No, BCM replacement is only necessary if it is determined to be the root cause after thorough diagnostics.

9. What tools are needed to troubleshoot the B3596 code in a Chevrolet?

Youâ€™ll need a scan tool capable of reading body control module codes, a multimeter for electrical tests, and wiring diagrams for the hazard lamp circuit.

10. Can a dead battery cause the B3596 code in a Chevrolet?

A weak or dead battery can cause voltage issues that may trigger the code, but itâ€™s not a common primary cause.