Home >> Land Rover >> 2023 >> Range Rover Velar HST >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index Vehicles With: 8HP45 8 Speed Automatic Transmission AWD: DTC Transmission Control Module (TCM) -- Range Rover Velar/L560 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - Vehicles With: 8HP45 8-Speed Automatic Transmission AWD/8HP70 8-Speed Automatic Transmission AWD, DTC: Transmission Control Module (TCM) (G2364188) >> U0100-87: Lost Communication With ECM/PCM "A" - Missing message >> Possible Causes