Code Definition

B109F — Intrusion Sensor Module: Component or System Operation Obstructed or Blocked

System: Body  |  Type: Manufacturer-Specific  |  Make: Ford

About B109F

B109F is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B109F is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B109F is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) monitors an intrusion sensor that watches the vehicle interior for movement while the perimeter anti theft alarm is armed. DTC B109F is logged when the BCM detects that the sensor cannot perform its normal monitoring function because its operation is obstructed or blocked, for example by an object placed over the sensor, a failure to return a valid self test response, or an environmental condition preventing normal function. On most Ford models the intrusion sensor is located in the overhead console or headliner area above the front seats. When this code is active...

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