DTC P1548 Ford

Cause and Solution

Short in the WHT wire between the Combination Switch Control Unit and the Relay Control Module (H L BACK-UP line) or between the Combination Switch Control Unit and the MICU Open GND circuit Blown fuse in the main under-hood fuse box Blown fuse in the under-dash fuse relay box Open or Short to ground at the Relay Control Unit Open or Short to ground at the Combination Control Unit. Faulty Relay Control Unit Faulty Combination Control Unit