AutoCodes – Chevrolet – B3935 2016 Chevrolet Silverado

B3935 2016 Chevrolet Silverado Code - Transponder Authentication

Quick Answer

When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energized by the exciter coil surrounding the ignition lock cylinder. Common causes include Faulty Key/Transmitter, Faulty 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: B3935 2016 Chevrolet Silverado indicates Transponder Authentication.
Common causes: Common causes include Faulty Key/Transmitter, Faulty 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.

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Code Popularity 273

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 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3935 2016 Chevrolet Silverado Description

When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energized by the exciter coil surrounding the ignition lock cylinder. The transponder transmits a signal to the immobilizer control module. The immobilizer control module translates this signal to a serial data message which is sent to the Body Control Module (BCM). The BCM then compares this value to a value stored in memory. If the value is correct, the BCM will send the prerelease password via the serial data circuit to the Engine Control Module (ECM) If the learned key code does not match or a transponder value is not received, the BCM will send the start disable password to the ECM.

OBDII Code B3935 2016 Chevrolet Silverado - Transponder Authentication - AutoCodes.com — B3935 2016 Chevrolet Silverado Code - Transponder Authentication

What does this mean?

What are the Possible Causes of the DTC B3935 2016 Chevrolet Silverado?

Faulty Key/Transmitter
Faulty Body Control Module (BCM)

How to Fix the DTC B3935 2016 Chevrolet Silverado?

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 B3935 2016 Chevrolet Silverado 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 B3935 2016 Chevrolet Silverado code?

Need more information on how to fix the B3935 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3935 2016 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 B3935 2016 Chevrolet Silverado Code

1. What does the OBDII code B3935 mean on a 2016 Chevrolet Silverado?

The code B3935 indicates an issue with the transponder authentication system, which is part of the vehicle's theft deterrent system.

2. What are common symptoms of the B3935 code on a 2016 Chevrolet Silverado?

Symptoms may include the engine not starting, the theft deterrent light staying on, or the vehicle failing to recognize the ignition key.

3. What causes the B3935 code to appear on a 2016 Chevrolet Silverado?

Common causes include a faulty transponder key, a damaged ignition switch, wiring issues, or a malfunction in the theft deterrent control module.

4. Can a dead key fob battery trigger the B3935 code?

No, a dead key fob battery typically does not trigger this code, but it may cause the key to not be recognized. The issue is more likely related to the transponder system within the key or vehicle.

5. How do I fix the B3935 code on my 2016 Chevrolet Silverado?

Repair steps may include reprogramming the key, replacing a faulty transponder key, inspecting and repairing wiring, or replacing the theft deterrent control module.

6. Can I clear the B3935 code without making repairs?

Clearing the code without addressing the underlying issue will likely result in the code returning. Proper diagnostics and repairs are necessary.

7. Do I need to replace my key if I get the B3935 code?

Not always. If the key is not damaged, the issue might lie in the vehicle's theft deterrent system or wiring. A technician can determine the best course of action.

8. Is the B3935 code related to the ignition switch?

Yes, a faulty or damaged ignition switch can prevent the transponder signal from being recognized, triggering the B3935 code.

9. Can a weak vehicle battery cause the B3935 code to appear?

A weak or dying vehicle battery can sometimes cause communication issues in the theft deterrent system, potentially triggering this code.

10. Should I take my 2016 Chevrolet Silverado to a dealership for the B3935 code?

While independent mechanics can handle this code, a dealership may have specialized tools and software for diagnosing and programming the transponder system.