Home >> Land Rover >> 2020 >> Range Rover SVAutobiography Dynamic >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Headlight Control Module (HCM) -- Range Rover/L405 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Headlamp Control Module (HCM) (G2167619) >> DTC U0046-88: Vehicle Communication Bus C - Bus off >> Possible Causes