Home › Land Rover › 2021 › Range Rover Autobiography Fifty Edition › Repair and Diagnosis › Quick Lookups › Common Specs & Procedures › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Range Rover/L405 › General Information › Description And Operation › Diagnostic Trouble Code Index - DTC: Transmission Control Module (TCM) (G2364188) › DTC P0606-04: Control Module Processor - System internal failures › Possible Causes