Home >> Jaguar >> 2018 >> XF S, AWD >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Deployable TOWBAR Control Module (DTCM) -- XF/X260 >> Diagnostic Trouble Code Index DTC: Deployable Towbar Control Module (DTCM) >> Description And Operation >> Deployable TOWBAR Control Module (DTCM) >> DTC B1548-23: Trailer Light Test Button - Signal stuck low >> Possible Causes