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Engine-Codes – Generic – B168E

B168E Code - Front Fog Lamp Switch Stuck

Quick Answer

The diagnostic code B168E indicates that the Front Fog Lamp Switch is stuck in the ON position. Common causes include Faulty Headlamp Switch that may be mechanically stuckHeadlamp Switch harness is open or shorted, causing incorrect signalsPoor electrical connection within the Headlamp Switch circuitCorrosion or damage in the wiring leading to the BCMFaulty Body Control Module (BCM) that misinterprets the switch status. 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
B168E indicates Front Fog Lamp Switch Stuck.
Common causes
Common causes include Faulty Headlamp Switch that may be mechanically stuckHeadlamp Switch harness is open or shorted, causing incorrect signalsPoor electrical connection within the Headlamp Switch circuitCorrosion or damage in the wiring leading to the BCMFaulty Body Control Module (BCM) that misinterprets the switch status.
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 Nov 05, 2025
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Code B168E Description

The diagnostic code B168E indicates that the Front Fog Lamp Switch is stuck in the ON position. This switch is a momentary switch that is part of the Headlamp switch assembly, which is responsible for controlling the vehicle's fog lights. The Body Control Module (BCM) monitors the input from the Headlamp switch and regulates various exterior lighting functions based on this input. When the BCM detects that the Fog Lamp switch has been activated for an extended period, it triggers this diagnostic trouble code (DTC).
OBDII Code B168E - Front Fog Lamp Switch Stuck
B168E Code - Front Fog Lamp Switch Stuck

Common Causes of B168E

  1. Faulty Headlamp Switch that may be mechanically stuck
  2. Headlamp Switch harness is open or shorted, causing incorrect signals
  3. Poor electrical connection within the Headlamp Switch circuit
  4. Corrosion or damage in the wiring leading to the BCM
  5. Faulty Body Control Module (BCM) that misinterprets the switch status

Symptoms of B168E

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Fog lights remaining illuminated even when the vehicle is off
  3. Inconsistent operation of fog lights (flickering or failure to turn on/off)
  4. Battery drain due to prolonged fog light activation
  5. Potential issues with other exterior lighting functions

How to Fix B168E

  1. Perform a visual inspection of the Headlamp switch and wiring for any signs of damage or corrosion.
  2. Test the Headlamp switch functionality using a multimeter to check for continuity and proper operation.
  3. If the switch is faulty, replace the Headlamp switch with a new component.
  4. Inspect the wiring harness for shorts or opens and repair any damaged connections.
  5. Clear the DTC using a diagnostic scanner and verify that the issue has been resolved through testing.

Cost to Fix B168E

The cost to diagnose and repair the B168E code typically ranges from $150 to $400, depending on the specific repairs needed. Replacement parts, such as a new Headlamp switch, can cost between $50 and $150, while labor costs can vary significantly based on the shop's hourly rates, which generally range from $80 to $150 per hour. Dealerships may charge higher rates, while independent shops may offer more competitive pricing. The total cost may also vary based on the vehicle's make and model, as well as the region where the service is performed.

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Code B168E 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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