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B3109 2015 GMC Sierra Code - Keyless Entry Transmitter 1 Battery

Quick Answer

The B3109 diagnostic trouble code (DTC) for a 2015 GMC Sierra specifically refers to an issue with the Keyless Entry Transmitter 1 Battery. Common causes include Key fob battery reaching the end of its lifespan, Defective key fob, Corrosion on key fob battery contacts. 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
B3109 2015 GMC Sierra indicates Keyless Entry Transmitter 1 Battery.
Common causes
Common causes include Key fob battery reaching the end of its lifespan, Defective key fob, Corrosion on key fob battery contacts.
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 15, 2024
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Code B3109 2015 GMC Sierra Description

The B3109 diagnostic trouble code (DTC) for a 2015 GMC Sierra specifically refers to an issue with the Keyless Entry Transmitter 1 Battery. This code indicates that there is a problem with the battery in the key fob or remote transmitter that is used to unlock and lock the vehicle. The keyless entry system allows for convenient access to the vehicle without the need to physically insert a key into the door lock.

OBDII Code B3109 2015 GMC Sierra - Keyless Entry Transmitter 1 Battery
B3109 2015 GMC Sierra Code - Keyless Entry Transmitter 1 Battery

Common Causes of B3109 2015 GMC Sierra

  1. Key fob battery reaching the end of its lifespan
  2. Defective key fob
  3. Corrosion on key fob battery contacts
  4. Electrical issues in the keyless entry system
  5. Faulty keyless entry receiver in the vehicle

Symptoms of B3109 2015 GMC Sierra

  1. Key fob not working consistently
  2. Difficulty in unlocking or locking the vehicle remotely
  3. Key fob not working at all
  4. Vehicle alarm system not responding to key fob commands
  5. Warning message on the instrument cluster indicating key fob battery low

How to Fix B3109 2015 GMC Sierra

  1. Purchase a new battery for the key fob - The first step is to obtain a replacement battery for the key fob. These batteries are commonly available at auto parts stores or can be purchased online.
  2. Open the key fob - Carefully open the key fob to access the old battery. This can usually be done by prying open the key fob with a small screwdriver.
  3. Replace the battery - Remove the old battery from the key fob and replace it with the new one, ensuring that the positive and negative terminals are correctly aligned.
  4. Close the key fob - Once the new battery is installed, close the key fob securely to prevent any damage.
  5. Test the key fob - Test the key fob to ensure that it is working properly and that the keyless entry system is functioning as expected.

Cost to Fix B3109 2015 GMC Sierra

The cost of replacing the battery in a key fob is relatively low, typically ranging from $5 to $15 for the battery itself. If the key fob needs to be replaced due to damage or malfunction, the cost can vary depending on the make and model of the vehicle. Labor costs for replacing the key fob battery are minimal, as it is a simple and quick procedure that can be done by the vehicle owner. However, if the key fob needs to be reprogrammed or if there are underlying electrical issues with the keyless entry system, additional costs may apply. It is advisable to consult with a professional mechanic or dealership for a more accurate cost estimate based on the specific circumstances of the vehicle. Labor rates at auto repair shops can vary, typically ranging from $80 to $150 per hour.

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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 B3109 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B3109 in a 2015 GMC Sierra related to the Keyless Entry Transmitter 1 Battery?

The common symptoms include malfunctioning keyless entry functions, such as difficulty unlocking or locking the doors remotely.

2. What are possible causes of OBDII code B3109 in a 2015 GMC Sierra?

The code B3109 can be triggered by a weak or dead battery in the keyless entry transmitter, a faulty transmitter unit, or issues with the vehicle's receiver system.

3. How can I diagnose the cause of OBDII code B3109 in my 2015 GMC Sierra?

To diagnose the issue, start by replacing the battery in the keyless entry transmitter. If the problem persists, consider checking the transmitter's functionality or the receiver system in the vehicle.

4. Can I repair OBDII code B3109 in my 2015 GMC Sierra myself?

Yes, replacing the battery in the keyless entry transmitter is a simple DIY repair that can often resolve the B3109 code. If the issue persists, consult a professional for further diagnostics.

5. Are there any quick tips to troubleshoot OBDII code B3109 in a 2015 GMC Sierra?

A quick tip is to try replacing the battery in the keyless entry transmitter first, as this is a common cause of the B3109 code. If the issue persists, further troubleshooting may be necessary.

6. Is it safe to continue driving my 2015 GMC Sierra with OBDII code B3109 related to the Keyless Entry Transmitter 1 Battery issue?

While the vehicle should still be safe to drive with this code, it is important to address the keyless entry transmitter battery issue to ensure proper functioning of the remote entry system.

7. What should I do if replacing the keyless entry transmitter battery does not resolve OBDII code B3109 in my 2015 GMC Sierra?

If replacing the battery does not fix the issue, consider checking the transmitter unit for any damage or consult a professional technician for further diagnosis and repair.

8. Can extreme temperatures affect the keyless entry transmitter battery and trigger OBDII code B3109 in a 2015 GMC Sierra?

Yes, extreme temperatures can impact the performance of the keyless entry transmitter battery, leading to the triggering of the B3109 code. It is advisable to keep the transmitter away from such conditions.

9. How often should I replace the battery in the keyless entry transmitter of my 2015 GMC Sierra to prevent OBDII code B3109?

It is recommended to replace the battery in the keyless entry transmitter every 1-2 years or as soon as you notice a decrease in the remote entry system's performance to prevent triggering the B3109 code.

10. Can a faulty vehicle receiver system cause OBDII code B3109 in a 2015 GMC Sierra even if the keyless entry transmitter battery is in good condition?

Yes, a faulty receiver system in the vehicle can also trigger the B3109 code, even if the keyless entry transmitter battery is functioning correctly. It is essential to check both components for proper operation.

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