HV

Tesla Model S/X stuck HV contactor: BMS_f038 errors, won't sleep, won't charge — diagnosis and replacement

Sticking HV battery contactors on early 85/90 kWh packs cause BMS_f038 / BMS_f087 errors, prevent the car from sleeping (12V drains overnight), and after a charge-station pyrofuse trigger leave the car unable to drive or charge. Service Mode diagnostics, replacement procedure, and why this is one of the few HV jobs you should not DIY.