Home >> Land Rover >> 2017 >> Discovery Sport SE >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) -- Discovery Sport/L550 >> Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) >> Description And Operation >> DTC B1B72-13: LIN Bus #1 Power Supply Circuit - Circuit open >> Possible Causes