Home › Land Rover › 2018 › Range Rover Supercharged › 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 B153C-13: Left Deployable Side Step Illumination - Circuit open › Possible Causes