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B3101 2018 GMC Sierra Code - Keyless Entry Data Link Circuit

Quick Answer

The B3101 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Keyless Entry Data Link Circuit. Common causes include Faulty keyless entry module, Damaged wiring or connectors in the Keyless Entry Data Link Circuit, Corrosion or poor connections in the circuit. 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 keyless entry module, Damaged wiring or connectors in the Keyless Entry Data Link Circuit, Corrosion or poor connections in the circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code B3101 2018 GMC Sierra Description

The B3101 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Keyless Entry Data Link Circuit. This code indicates a problem with the communication link between the keyless entry system and the vehicle's electronic control modules. The keyless entry system allows the driver to lock and unlock the vehicle remotely using a key fob, and it also enables features like remote start and panic alarms. When this circuit malfunctions, it can lead to issues with the keyless entry system, affecting the convenience and security of the vehicle.

OBDII Code B3101 2018 GMC Sierra - Keyless Entry Data Link Circuit
B3101 2018 GMC Sierra Code - Keyless Entry Data Link Circuit

Common Causes of B3101 2018 GMC Sierra

  1. Faulty keyless entry module.
  2. Damaged wiring or connectors in the Keyless Entry Data Link Circuit.
  3. Corrosion or poor connections in the circuit.
  4. Issues with the body control module.
  5. Electrical interference affecting the communication between modules.

Symptoms of B3101 2018 GMC Sierra

  1. Inability to lock or unlock the doors using the keyless entry system.
  2. Remote start feature not working.
  3. Alarm system not responding to key fob commands.
  4. Key fob buttons not working as intended.
  5. Warning light on the dashboard related to the keyless entry system.

How to Fix B3101 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the Keyless Entry Data Link Circuit, checking for any visible damage to the wiring or connectors.
  2. Use a multimeter to test the continuity and resistance of the circuit components to identify any faulty parts.
  3. Inspect the keyless entry module and body control module for any signs of malfunction, and replace them if necessary.
  4. Repair or replace any damaged wiring or connectors in the circuit.
  5. Clear the DTC from the vehicle's computer system using a diagnostic scan tool after completing the repairs.

Cost to Fix B3101 2018 GMC Sierra

The cost of repairing the Keyless Entry Data Link Circuit issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of parts for this repair can range from $100 to $300, while labor costs may add another $100 to $200 to the total bill. Therefore, the total repair cost for addressing the B3101 code in a 2018 GMC Sierra could be around $200 to $500. It's important to note that these are rough estimates, and actual costs may differ based on factors such as location, labor rates, and the availability of parts. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate tailored to your specific situation.

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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 vehicle’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 vehicle’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.

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