Typical picture
- Moisture/condensate gets into the HV battery housing through the breather valves or the fuse block cover → corrosion of busbars/connectors, BMS_F107 errors, etc.
What to check
- Condition of the valves, corrosion of the fuse cover.
- Sealing test of the housing per the manual (low pressure ~0.19 psi).
Repair
- Local leak repair, cleaning/drying, replacement of affected BMBs/modules.
- With deep corrosion — pack removal and bench repair.
Cost in Belarus
≈ $600–4 000 depending on the extent of damage (often $1–2 k).
Links
- Problem overview (valves/AC drain): https://www.autoevolution.com/news/check-the-tesla-model-s-moisture-ingress-problem-with-comprehensive-video-199337.html
- Video: cover corrosion/water in the fuse compartment — https://www.youtube.com/watch?v=GZN8pawcQkg
Sources
- https://www.autoevolution.com/news/check-the-tesla-model-s-moisture-ingress-problem-with-comprehensive-video-199337.html
- https://www.youtube.com/watch?v=GZN8pawcQkg
- https://tesware.net/alerts/modelS/BMS_f107_SW_Cell_Voltage_Sensor
- https://t.me/teslacar_chat/682998
- https://t.me/teslacar_chat/518930
- https://t.me/teslacar_chat/512099
- https://t.me/teslacar_chat/265953
- https://t.me/teslacar_chat/37193
- https://t.me/teslacar_chat/603425
- https://t.me/teslacar_chat/565042
Related
Full list →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.
Model S/X 90 kWh: faster degradation than 85
90-kWh packs (NCA with silicon added to the anode) per owner reports degrade faster than 85. Fewer typical 'fatal' defects.
Model S/X: LDU problems (the large rear motor) — seal leak and failure
Typical defect: coolant leaks past the rotor seal → ingress into the stator/inverter, noise/corrosion and motor death. What to check, how to fix it, and what it costs in Belarus.