Code Definition

B12FF (48) — Rear Door Switch Illumination

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

About B12FF

B12FF 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.

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.

B12FF 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) on the affected Ford controls and monitors the illumination supply for the rear door switch backlighting, which is typically driven as a low side or PWM controlled output so the BCM can dim the switch lighting in step with the dash panel illumination. DTC B12FF is logged against the rear door switch illumination circuit. The :48 sub code in UDS standard notation most commonly indicates a calibration or parameter memory failure for that circuit channel, although historical Ford interpretations have also referenced an over voltage condition or short to battery on th...

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