AutoCodes – Generic – B3101

B3101 Code - Keyless Entry Data Link Circuit

Quick Answer

The Body Control Module (BCM) communicates with the Remote Control Door Lock Receiver (RCDLR) through the keyless entry serial data circuits. Common causes include Faulty Remote Control Door Lock Receiver (RCDLR), Remote Control Door Lock Receiver harness is open or shorted, Remote Control Door Lock Receiver circuit poor electrical connection. 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: B3101 indicates Keyless Entry Data Link Circuit.
Common causes: Common causes include Faulty Remote Control Door Lock Receiver (RCDLR), Remote Control Door Lock Receiver harness is open or shorted, Remote Control Door Lock Receiver circuit poor electrical connection.
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 9,321

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 B3101 Description

The Body Control Module (BCM) communicates with the Remote Control Door Lock Receiver (RCDLR) through the keyless entry serial data circuits. When any button on the keyless entry transmitter is pressed, the transmitter sends a signal to the RCDLR. The RCDLR sends a function request to the BCM, depending on which button is pressed on the transmitter. The body control module receives the message and performs the appropriate function. The Diagnostic Trouble Code (DTC) sets when o response is received from the RCDLR after the BCM requests information from or sends configuration commands to the RCDLR.

OBDII Code B3101 - Keyless Entry Data Link Circuit - AutoCodes.com — B3101 Code - Keyless Entry Data Link Circuit

What does this mean?

What are the Possible Causes of the DTC B3101?

Faulty Remote Control Door Lock Receiver (RCDLR)
Remote Control Door Lock Receiver harness is open or shorted
Remote Control Door Lock Receiver circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3101?

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 B3101 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 B3101 code?

Need more information on how to fix the B3101 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3101 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3101 Buick — Keyless Entry Data Link Circuit
B3101 Cadillac — Keyless Entry Data Link Circuit
B3101 Chevrolet — Keyless Entry Data Link Circuit
B3101 GMC — Keyless Entry Data Link Circuit

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 B3101 Code

1. What are common symptoms of OBDII code B3101 related to the Keyless Entry Data Link Circuit?

Symptoms may include non-functional keyless entry system, inability to lock or unlock the vehicle remotely, or intermittent issues with the key fob.

2. What are possible causes of OBDII code B3101?

Potential causes include a faulty key fob, damaged wiring in the keyless entry system, a malfunctioning receiver module, or issues with the vehicle's body control module.

3. How can I diagnose the Keyless Entry Data Link Circuit issue causing OBDII code B3101?

Diagnosis typically involves checking the key fob battery, inspecting the keyless entry system wiring for damage, testing the receiver module for proper functionality, and scanning the vehicle's body control module for related error codes.

4. Can a DIY enthusiast repair OBDII code B3101 associated with the Keyless Entry Data Link Circuit?

Basic repairs such as replacing the key fob battery or checking for damaged wiring can be performed by DIY enthusiasts. However, more complex issues may require professional diagnosis and repair.

5. Are there any quick tips for troubleshooting OBDII code B3101 without specialized tools?

Simple steps like replacing the key fob battery, ensuring the key fob is working correctly, and visually inspecting the keyless entry system wiring for damage can sometimes resolve the issue.

6. How critical is it to address OBDII code B3101 related to the Keyless Entry Data Link Circuit promptly?

While the vehicle may still be operable with this code present, addressing it promptly is recommended to ensure the proper functioning of the keyless entry system and avoid potential inconveniences.

7. Can a malfunctioning keyless entry system due to OBDII code B3101 pose any safety concerns?

While not a direct safety risk, a malfunctioning keyless entry system can lead to inconvenience and potential security issues if the vehicle cannot be locked or unlocked properly.

8. Is resetting the vehicle's computer a possible solution for OBDII code B3101?

Resetting the vehicle's computer may temporarily clear the code, but if the underlying issue causing OBDII code B3101 persists, the code is likely to return.

9. How much does it typically cost to repair OBDII code B3101 related to the Keyless Entry Data Link Circuit?

Costs can vary depending on the specific cause of the issue. Basic repairs like replacing a key fob battery may be inexpensive, while more complex repairs involving module replacements can be costly.

10. Can OBDII code B3101 be triggered by issues unrelated to the keyless entry system?

While B3101 is specifically related to the Keyless Entry Data Link Circuit, other issues in the vehicle's electrical system or modules can sometimes trigger this code.