AutoCodes – Chevrolet – B3935 2015 Chevrolet Silverado

B3935 2015 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 2015 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 474

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 2015 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 2015 Chevrolet Silverado - Transponder Authentication - AutoCodes.com — B3935 2015 Chevrolet Silverado Code - Transponder Authentication

What does this mean?

What are the Possible Causes of the DTC B3935 2015 Chevrolet Silverado?

Faulty Key/Transmitter
Faulty Body Control Module (BCM)

How to Fix the DTC B3935 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the B3935 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3935 2015 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 2015 Chevrolet Silverado Code

1. What does OBDII code B3935 mean on a 2015 Chevrolet Silverado?

The B3935 code on a 2015 Chevrolet Silverado indicates a transponder authentication error.

2. What are the common symptoms of OBDII code B3935 on a 2015 Chevrolet Silverado?

Common symptoms of code B3935 may include issues with starting the vehicle, intermittent starting problems, or a no-start condition.

3. What can cause OBDII code B3935 to appear on a 2015 Chevrolet Silverado?

Code B3935 is typically triggered by problems with the transponder key, immobilizer system, key fob, or issues with the vehicle's computer system.

4. How can I diagnose the source of OBDII code B3935 on a 2015 Chevrolet Silverado?

To diagnose code B3935, it is recommended to perform a thorough inspection of the transponder key, key fob, immobilizer system, and associated wiring for any visible damage or malfunctions.

5. Can I repair OBDII code B3935 on a 2015 Chevrolet Silverado myself?

While some DIY enthusiasts may attempt to address code B3935 themselves, it is recommended to consult with a professional automotive technician for an accurate diagnosis and proper repair.

6. Are there any quick tips for fixing OBDII code B3935 on a 2015 Chevrolet Silverado?

Quick tips for addressing code B3935 may include checking the transponder key's battery, ensuring the key fob is functioning correctly, and verifying the immobilizer system is not compromised.

7. Will OBDII code B3935 prevent my 2015 Chevrolet Silverado from starting?

In some cases, code B3935 may prevent the vehicle from starting if it is related to a transponder authentication failure. It is important to address this issue promptly to avoid potential starting problems.

8. How much does it typically cost to repair OBDII code B3935 on a 2015 Chevrolet Silverado?

The cost of repairing code B3935 can vary depending on the root cause of the issue and the labor rates of the repair shop. It is advisable to obtain multiple quotes for an accurate estimate.

9. Can resetting the OBDII system clear code B3935 on a 2015 Chevrolet Silverado?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing B3935 is not addressed, the code is likely to reappear. It is best to diagnose and fix the root cause of the problem.

10. Is it safe to continue driving my 2015 Chevrolet Silverado with OBDII code B3935 present?

It is not recommended to drive your vehicle with unresolved OBDII code B3935, as it may lead to potential starting issues or other problems. It is advisable to address the code promptly to ensure the vehicle's proper functioning.