AutoCodes – GMC – B3109 GMC

B3109 GMC 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 GMC 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 4,247

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

What does this mean?

What are the Possible Causes of the DTC B3109 GMC?

Low Keyless Entry Transmitter Battery
Faulty Keyless Entry Transmitter

How to Fix the DTC B3109 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the B3109 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

B3109 2014 GMC Sierra — Keyless Entry Transmitter 1 Battery
B3109 2015 GMC Sierra — Keyless Entry Transmitter 1 Battery
B3109 2016 GMC Sierra — Keyless Entry Transmitter 1 Battery
B3109 2017 GMC Sierra — Keyless Entry Transmitter 1 Battery
B3109 2018 GMC Sierra — Keyless Entry Transmitter 1 Battery

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 GMC Code

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

The common symptoms include issues with the keyless entry system, such as the remote not working or having a weak signal.

2. What causes OBDII code B3109 GMC to trigger for Keyless Entry Transmitter 1 Battery?

This code is triggered when the keyless entry transmitter 1 battery voltage is low or the battery needs to be replaced.

3. How can I diagnose OBDII code B3109 GMC for Keyless Entry Transmitter 1 Battery?

You can diagnose this code by checking the battery voltage of the keyless entry transmitter 1 using a multimeter and inspecting the transmitter for any visible damage.

4. Can a low car battery cause OBDII code B3109 GMC to appear for Keyless Entry Transmitter 1 Battery?

A low car battery can indirectly affect the keyless entry transmitter 1 battery, leading to the triggering of OBDII code B3109. It's important to ensure the car battery is in good condition.

5. What is the recommended repair for OBDII code B3109 GMC related to Keyless Entry Transmitter 1 Battery?

The recommended repair is to replace the battery in the keyless entry transmitter 1 with a new one of the correct type and voltage.

6. Are there any DIY tips for fixing OBDII code B3109 GMC associated with the Keyless Entry Transmitter 1 Battery?

Yes, you can try replacing the battery in the keyless entry transmitter 1 yourself by following the manufacturer's instructions for your specific vehicle model.

7. How important is it to address OBDII code B3109 GMC for Keyless Entry Transmitter 1 Battery promptly?

It is important to address this code promptly to ensure the proper functioning of the keyless entry system in your vehicle and to avoid any inconvenience or security issues.

8. Can resetting the vehicle's computer system clear OBDII code B3109 GMC for Keyless Entry Transmitter 1 Battery?

Resetting the computer system may temporarily clear the code, but if the underlying issue of a low battery voltage in the keyless entry transmitter 1 is not addressed, the code is likely to reappear.

9. Is it safe to continue driving with OBDII code B3109 GMC related to Keyless Entry Transmitter 1 Battery?

While it may be safe to drive with this code, it is recommended to address it as soon as possible to ensure the proper functioning of the keyless entry system in your vehicle.

10. How much does it typically cost to replace the battery for Keyless Entry Transmitter 1 when dealing with OBDII code B3109 GMC?

The cost of replacing the battery for the Keyless Entry Transmitter 1 can vary depending on the vehicle make and model, but generally, it is an affordable repair that can be done at home or by a professional.