AutoCodes – GMC – B3101 2018 GMC Sierra

B3101 2018 GMC Sierra 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 2018 GMC Sierra 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 224

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2018 GMC Sierra 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 2018 GMC Sierra - Keyless Entry Data Link Circuit - AutoCodes.com — B3101 2018 GMC Sierra Code - Keyless Entry Data Link Circuit

What does this mean?

What are the Possible Causes of the DTC B3101 2018 GMC Sierra?

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 2018 GMC Sierra?

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 2018 GMC Sierra 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 2018 GMC Sierra code?

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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 B3101 2018 GMC Sierra Code

1. What does the OBDII code B3101 mean on a 2018 GMC Sierra?

The code B3101 indicates an issue with the Keyless Entry Data Link Circuit, which may involve problems with communication between the keyless entry system and the vehicleâ€™s control module.

2. What are the common symptoms of the B3101 code in a 2018 GMC Sierra?

Common symptoms include the key fob not working, doors failing to lock or unlock remotely, and possible warning messages on the dashboard.

3. What causes the B3101 code to appear on a 2018 GMC Sierra?

Causes may include a malfunctioning key fob, a damaged or disconnected data link wire, a faulty keyless entry receiver module, or issues with the vehicleâ€™s Body Control Module (BCM).

4. Can a weak key fob battery trigger the B3101 code?

Yes, a weak or dead key fob battery can disrupt communication and trigger the B3101 code.

5. How do I diagnose the B3101 code on my 2018 GMC Sierra?

Start by checking the key fob battery, inspecting the data link circuit for damage, and using a diagnostic scanner to test the keyless entry receiver and BCM for faults.

6. Can I still drive my 2018 GMC Sierra with the B3101 code?

Yes, the vehicle should still be drivable, but keyless entry functions may be impaired, which can be inconvenient.

7. How is the B3101 code typically repaired?

Repairs may include replacing the key fob battery, fixing or replacing damaged wiring in the data link circuit, or replacing a faulty keyless entry receiver or BCM.

8. Is reprogramming required after fixing the B3101 code?

In some cases, reprogramming the key fob or resetting the BCM may be necessary to restore proper functionality.

9. Can environmental interference cause the B3101 code?

Yes, strong radio frequency interference or physical obstructions can temporarily disrupt the keyless entry system and trigger the code.

10. How much does it cost to fix the B3101 code on a 2018 GMC Sierra?

The cost varies depending on the issue, ranging from a few dollars for a key fob battery replacement to several hundred dollars if the keyless entry receiver or BCM needs replacement or reprogramming.