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B3105 2015 GMC Sierra Code - Keyless Entry Transmitters

Quick Answer

The B3105 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to an issue with the keyless entry transmitters. Common causes include Faulty key fob, Malfunctioning receiver module, Wiring issues in the keyless entry system. 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
B3105 2015 GMC Sierra indicates Keyless Entry Transmitters.
Common causes
Common causes include Faulty key fob, Malfunctioning receiver module, Wiring issues in the keyless entry system.
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 14, 2024
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Code B3105 2015 GMC Sierra Description

The B3105 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to an issue with the keyless entry transmitters. Keyless entry systems allow drivers to lock and unlock their vehicles remotely using a key fob. When this code is triggered, it indicates a problem with the communication between the keyless entry transmitters and the vehicle's receiver module. This can result in the key fobs not working properly, leading to difficulties in locking or unlocking the vehicle.

OBDII Code B3105 2015 GMC Sierra - Keyless Entry Transmitters
B3105 2015 GMC Sierra Code - Keyless Entry Transmitters

Common Causes of B3105 2015 GMC Sierra

  1. Faulty key fob
  2. Malfunctioning receiver module
  3. Wiring issues in the keyless entry system
  4. Weak battery in the key fob
  5. Interference from other electronic devices

Symptoms of B3105 2015 GMC Sierra

  1. Key fobs not working to lock or unlock the vehicle
  2. Intermittent operation of the keyless entry system
  3. Inability to start the vehicle remotely
  4. Key fob buttons not responding when pressed
  5. Warning light on the dashboard related to the keyless entry system

How to Fix B3105 2015 GMC Sierra

  1. Replace the battery in the key fob: Start by replacing the battery in the key fob to ensure it is not the cause of the issue.
  2. Check and repair wiring: Inspect the wiring in the keyless entry system for any damage or loose connections. Repair or replace any faulty wiring.
  3. Test key fobs: Test the key fobs to determine if they are functioning properly. Replace any faulty key fobs.
  4. Replace receiver module: If the issue persists, the receiver module may need to be replaced to restore proper communication with the key fobs.
  5. Re-program key fobs: After completing the repairs, re-program the key fobs to ensure they are synchronized with the vehicle's receiver module.

Cost to Fix B3105 2015 GMC Sierra

The cost of repairing a keyless entry transmitter issue can vary depending on the specific cause of the problem. Replacing a key fob battery is relatively inexpensive, typically costing around $5-$20. Repairing wiring issues or replacing a receiver module can range from $100-$300 or more, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 B3105 2015 GMC Sierra Code

1. What does OBDII code B3105 mean for a 2015 GMC Sierra related to Keyless Entry Transmitters?

This code indicates a fault with the keyless entry transmitters in the vehicle.

2. What are common symptoms of OBDII code B3105 in a 2015 GMC Sierra?

Common symptoms include issues with remote keyless entry functionality, such as the key fob not unlocking or locking the doors.

3. What are possible causes of OBDII code B3105 in a 2015 GMC Sierra?

Possible causes include a malfunctioning key fob, a faulty receiver in the vehicle, or issues with the keyless entry system's wiring.

4. How can I diagnose the problem associated with OBDII code B3105 in a 2015 GMC Sierra?

Diagnosing the issue typically involves checking the key fob battery, testing the key fob signal, inspecting the receiver unit in the vehicle, and ensuring there are no wiring issues.

5. Can I repair OBDII code B3105 in a 2015 GMC Sierra myself?

Depending on the cause of the issue, simple fixes like replacing the key fob battery or reprogramming the key fob may resolve the problem. For more complex issues, it's recommended to consult a professional mechanic.

6. Are there any troubleshooting tips for resolving OBDII code B3105 in a 2015 GMC Sierra?

Try replacing the key fob battery, ensuring the key fob is properly synced with the vehicle, and checking for any visible damage to the key fob or receiver unit.

7. Is it safe to continue driving with OBDII code B3105 present in a 2015 GMC Sierra?

While the vehicle should still be safe to drive with this code, it's important to address the keyless entry transmitter issue to ensure convenience and security features are working properly.

8. How much does it typically cost to repair OBDII code B3105 in a 2015 GMC Sierra?

The cost of repair can vary depending on the cause of the issue. Simple fixes like replacing a key fob battery may be inexpensive, while more complex repairs involving the receiver unit could be more costly.

9. Can extreme weather conditions affect the keyless entry transmitters and trigger OBDII code B3105 in a 2015 GMC Sierra?

Yes, extreme temperatures or moisture exposure can sometimes impact the performance of keyless entry transmitters, leading to potential issues with the system.

10. Are there any preventive maintenance steps to avoid encountering OBDII code B3105 in a 2015 GMC Sierra?

Regularly checking and replacing key fob batteries, keeping the key fob and receiver unit clean, and avoiding physical damage to the key fob can help prevent issues with the keyless entry system.

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