AutoCodes – Generic – B3105

B3105 Code - Keyless Entry Transmitters

Quick Answer

The Body Control Module (BCM) monitors the number of keyless entry transmitters programmed. Common causes include Faulty Keyless Entry Transmitters, 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: B3105 indicates Keyless Entry Transmitters.
Common causes: Common causes include Faulty Keyless Entry Transmitters, 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 4,527

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
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Code B3105 Description

The Body Control Module (BCM) monitors the number of keyless entry transmitters programmed. Until at least one transmitter is programmed, the Body Control Module determines a malfunction condition exists. The Diagnostic Trouble Code (DTC) will be set when no keyless entry transmitter is programmed to the Body Control Module.

OBDII Code B3105 - Keyless Entry Transmitters - AutoCodes.com — B3105 Code - Keyless Entry Transmitters

What does this mean?

What are the Possible Causes of the DTC B3105?

Faulty Keyless Entry Transmitters
Faulty Body Control Module (BCM)

How to Fix the DTC B3105?

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 B3105 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 B3105 code?

Need more information on how to fix the B3105 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3105 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3105 Buick — Keyless Entry Transmitters
B3105 Cadillac — Keyless Entry Transmitters
B3105 Chevrolet — Keyless Entry Transmitters
B3105 GMC — Keyless Entry Transmitters

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 Code

1. What are the common symptoms of OBDII code B3105 related to Keyless Entry Transmitters?

- Common symptoms include malfunctioning keyless entry system, inability to lock or unlock doors remotely, and issues with the trunk release function.

2. What are some possible causes of OBDII code B3105 for Keyless Entry Transmitters?

- Possible causes include faulty key fob batteries, damaged key fob circuitry, malfunctioning receiver unit in the vehicle, or a problem with the vehicle's body control module.

3. How can I diagnose the OBDII code B3105 for Keyless Entry Transmitters?

- Diagnosis involves checking the batteries in the key fob, ensuring the key fob is transmitting a signal, inspecting the receiver unit in the vehicle, and using a diagnostic scan tool to read the specific error code.

4. What are some repair tips for fixing OBDII code B3105 related to Keyless Entry Transmitters?

- Repair tips may include replacing the key fob batteries, reprogramming the key fob, repairing or replacing the receiver unit in the vehicle, or resetting the body control module.

5. Can OBDII code B3105 for Keyless Entry Transmitters be fixed at home, or do I need professional help?

- Depending on the cause of the issue, some fixes like replacing key fob batteries can be done at home. However, more complex repairs involving the vehicle's electronics may require professional help.

6. Is it safe to continue driving with OBDII code B3105 related to Keyless Entry Transmitters?

- While the code itself may not affect the drivability of the vehicle, it is important to address the underlying issue to ensure the keyless entry system functions properly for convenience and security.

7. How much does it typically cost to repair OBDII code B3105 for Keyless Entry Transmitters?

- The cost of repair can vary depending on the cause of the issue. Simple fixes like replacing key fob batteries may be inexpensive, while repairing or replacing electronic components can be more costly.

8. Are there any preventative measures to avoid OBDII code B3105 for Keyless Entry Transmitters?

- Regularly checking and replacing key fob batteries, avoiding physical damage to key fobs, and keeping the key fob away from water or extreme temperatures can help prevent issues with the keyless entry system.

9. Can a malfunctioning keyless entry system due to OBDII code B3105 cause other problems in the vehicle?

- While the keyless entry system itself may not directly cause other issues, a malfunction could potentially lead to security risks or inconveniences if not addressed promptly.

10. How long does it typically take to repair OBDII code B3105 for Keyless Entry Transmitters?

- The repair time can vary depending on the cause of the issue and the complexity of the repairs needed. Simple fixes like replacing key fob batteries can be done quickly, while more involved repairs may take longer.