AutoCodes – Buick – B3109 Buick

B3109 Buick Code - Keyless Entry Transmitter 1 Battery

Quick Answer

With each press of a keyless entry transmitter button, a message containing the current battery state of the transmitter is sent to the Remote Control Door Lock Receiver (RCDLR), along with the commanded keyless entry function. Common causes include Low Keyless Entry Transmitter Battery, Faulty Keyless Entry Transmitter. 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 Buick indicates Keyless Entry Transmitter 1 Battery.
Common causes: Common causes include Low Keyless Entry Transmitter Battery, Faulty Keyless Entry Transmitter.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,677

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 11, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B3109 Buick Description

With each press of a keyless entry transmitter button, a message containing the current battery state of the transmitter is sent to the Remote Control Door Lock Receiver (RCDLR), along with the commanded keyless entry function. The Remote Control Door Lock Receiver sends this to the Body Control Module (BCM) to perform the requested function. The Diagnostic Trouble Code (DTC) sets when three consecutive low-battery signals are received from the same transmitter.

OBDII Code B3109 Buick - Keyless Entry Transmitter 1 Battery - AutoCodes.com — B3109 Buick Code - Keyless Entry Transmitter 1 Battery

What does this mean?

What are the Possible Causes of the DTC B3109 Buick?

Low Keyless Entry Transmitter Battery
Faulty Keyless Entry Transmitter

How to Fix the DTC B3109 Buick?

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 B3109 Buick 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 B3109 Buick code?

Need more information on how to fix the B3109 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3109 Buick 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 B3109 Buick Code

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

The common symptoms include a malfunctioning keyless entry system, difficulty locking or unlocking the car remotely, and a warning light on the dashboard.

2. What causes the OBDII code B3109 in a Buick related to the Keyless Entry Transmitter 1 Battery?

The code is typically triggered when the battery in the keyless entry transmitter is low or needs replacement.

3. How can I diagnose a low battery issue in the keyless entry transmitter causing the B3109 code in my Buick?

You can try replacing the battery in the keyless entry transmitter and see if the issue resolves. If the problem persists, further diagnostics may be needed.

4. Can a weak keyless entry transmitter battery cause other issues in my Buick besides triggering the B3109 code?

Yes, a weak keyless entry transmitter battery can lead to intermittent or complete failure of the keyless entry system, affecting convenience and security features.

5. Is it possible to reset the OBDII code B3109 in a Buick related to the Keyless Entry Transmitter 1 Battery without replacing the battery?

Resetting the code without replacing the battery may temporarily clear the warning, but it is recommended to address the root cause by replacing the battery to prevent future occurrences.

6. How often should I replace the battery in the keyless entry transmitter of my Buick to avoid triggering the B3109 code?

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's range or responsiveness.

7. Can I replace the keyless entry transmitter battery in my Buick myself, or should I seek professional help?

Replacing the keyless entry transmitter battery is typically a straightforward DIY task that can be done at home with a new battery and basic tools. However, if you are unsure, consulting a professional is always an option.

8. Will replacing the keyless entry transmitter battery in my Buick erase any saved settings or codes?

Replacing the battery in the keyless entry transmitter should not affect any saved settings or codes in your vehicle. The new battery should simply restore proper functionality to the remote.

9. Is the OBDII code B3109 related to the Keyless Entry Transmitter 1 Battery a serious issue in my Buick that requires immediate attention?

While the B3109 code related to the keyless entry transmitter battery is not a critical problem, addressing it promptly can prevent inconvenience and ensure the proper functioning of your keyless entry system.

10. What should I do if replacing the keyless entry transmitter battery does not resolve the B3109 code in my Buick?

If replacing the battery does not clear the code, there may be an underlying issue with the keyless entry system that requires further inspection by a professional technician to diagnose and repair.