Service Mode
2 article(s) on «Service Mode». Sorted by severity — most severe first.
Tesla battery errors (BMS): Service Mode codes decoded, what they mean & repair cost (2026)
Full breakdown of the scary Tesla battery codes from Service Mode: BMS_a066/a064/a079 (imbalance), BMS_f107 (sense tabs), BMS_a035/a037 (moisture), BMS_f038 (contactor). What each error means, who it affects (model/year/chemistry) and what the repair costs in Belarus, with links to detailed articles.
Radiator health in Service Mode: where the percentage comes from and why it falls
Firmware from the 2026.20.* branch added a radiator health percentage to Service Mode. In the summer of 2026 it sagged across the fleet: 79% on a refreshed Model 3, 83%, 76%, and for one owner 100% turned into 65% in three weeks. The number comes back to 100 neither after cleaning the stack nor after fitting a new radiator. What sits behind it, and when it really is about dirt.