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Engine-Codes – Generic – B2108

B2108 Code - Trunk Key Cylinder Switch Failure

Quick Answer

The B2108 diagnostic trouble code refers to a trunk key cylinder switch failure. Common causes include Faulty trunk key cylinder switch, Wiring issues or electrical problems, Corrosion or debris in the trunk key cylinder. 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
B2108 indicates Trunk Key Cylinder Switch Failure.
Common causes
Common causes include Faulty trunk key cylinder switch, Wiring issues or electrical problems, Corrosion or debris in the trunk key cylinder.
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 07, 2024
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Code B2108 Description

The B2108 diagnostic trouble code refers to a trunk key cylinder switch failure. This code is typically found in vehicles equipped with a key-operated trunk lock. The trunk key cylinder switch is responsible for detecting when the key is inserted into the trunk lock and signaling the vehicle's computer system to unlock the trunk. When this switch fails, it can prevent the key from properly unlocking the trunk, leading to inconvenience for the vehicle owner.

OBDII Code B2108 - Trunk Key Cylinder Switch Failure
B2108 Code - Trunk Key Cylinder Switch Failure

Common Causes of B2108

  1. Faulty trunk key cylinder switch
  2. Wiring issues or electrical problems
  3. Corrosion or debris in the trunk key cylinder
  4. Mechanical issues with the trunk lock mechanism
  5. Poor connection between the switch and the vehicle's computer system

Symptoms of B2108

  1. Key does not turn or unlock the trunk
  2. Trunk does not open when key is inserted and turned
  3. Alarm system may be triggered when attempting to unlock the trunk
  4. Trunk light remains on even when the trunk is closed

How to Fix B2108

  1. Diagnose the issue by testing the trunk key cylinder switch with a multimeter to determine if it is functioning properly.
  2. Inspect the wiring and connections to ensure there are no loose or damaged wires causing the issue.
  3. Clean the trunk key cylinder and surrounding area to remove any debris or corrosion that may be interfering with the switch's operation.
  4. Replace the trunk key cylinder switch if it is found to be faulty or not functioning as intended.
  5. Test the trunk lock and switch after repairs to ensure proper functionality.

Cost to Fix B2108

The typical repair costs for a trunk key cylinder switch failure can range from $100 to $300, depending on the make and model of the vehicle and the labor rates of the auto repair shop. Additional costs may include diagnostic testing, replacement parts, and any necessary labor. It is advisable to contact local auto repair shops for accurate pricing information based on your specific vehicle and location.

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Code B2108 Information for Specific Makes

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.

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