Tesla Cybertruck Slow Charging Error: High Voltage Wire Fault

Is your Tesla Cybertruck experiencing agonizingly slow DC fast charging speeds, or cutting off early at the Supercharger? You aren’t alone. A growing number of 2024 and 2025 Tesla Cybertruck owners are discovering a hidden hardware issue that severely bottlenecks or completely disables vehicle charging. While many drivers naturally assume a faulty Supercharger post, battery thermal management issues, or cold weather are to blame, real-world diagnostic troubleshooting points to a physical hardware defect in the high-voltage architecture.

Internal vehicle sensors frequently detect a major voltage drop across the AC junction box high-voltage harness. The root cause is a manufacturing defect where the factory crimp connection at the termination points was not performed correctly. When high-current DC fast charging pumps hundreds of amps through this weak terminal connection, the high-voltage joint acts like a heating element. To prevent localized heating, thermal damage, or dangerous arcing inside the battery bay, the Battery Management System (BMS) steps in to throttle charging performance—triggering error alerts like BMS_a063 and cutting charging speeds to a crawl.

Tesla has addressed this via service bulletin SB-25-16-006, classifying it as a mandatory proactive repair whenever a vehicle is in for service. Because this hardware fix requires fully disabling the mid-voltage and high-voltage systems and performing precise microohm impedance testing using a Hioki impedance analyzer, it cannot be handled by mobile service. Watch this video to see the full technical repair breakdown, the specific factory specifications, and how much this out-of-warranty hardware replacement costs at an independent EV repair shop versus a Tesla Service Center.

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Видео Tesla Cybertruck Slow Charging Error: High Voltage Wire Fault канала Fixbook