Home >> Land Rover >> 2016 >> Range Rover Autobiography >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Deployable TOWBAR Control Module (DTCM) -- Range Rover/L405 >> Diagnostic Trouble Code Index DTC: Deployable TOWBAR Control Module (DTCM) >> Description And Operation >> DTC B1556-23: Deployable Side Step Button - Signal stuck low >> Possible Causes