Code Definition

B2120 — Door Passenger Set Switch Stuck Failure

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Ford

About B2120

B2120 is a generic (obd-ii standard) 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.

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.

Because B2120 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Body Control Module (BCM) or memory seat module monitors the passenger door set switch input which is used in conjunction with the passenger memory seat and mirror functions on equipped vehicles. DTC B2120 sets when the BCM detects that the door passenger set switch input has been held in the active state for longer than the calibrated time threshold, indicating a stuck switch condition. The set switch normally provides a momentary input that allows the passenger to store their seat and mirror position preferences to a memory preset. When this code is set, the passenger memory functions wi...

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