Tesla high-voltage battery repair, replacement & upgrade for all models

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Errors most commonly associated with battery failure

When a Teslas battery fails these are the most common errors that may appear on the Teslas odometer and main screen. Please keep in mind that in some rare cases you may receive one of these errors and it will not be related to battery. That's why we always recommend getting a diagnostic.


Maximum battery charge level reduced - BMS-U029

On the small screen, you will see an error message indicating a reduction in the maximum battery charge level, while on the center screen in the error menu, it will be identified by the code BMS-U029. This error signifies the presence of a definite problem, with high likelihood (95%) attributed to a malfunction in the high-voltage battery, and only a small chance (5%) that it could be caused by another factor. As a result of this error, your vehicle is unlikely to reach a full 100% charge. There are instances where the display may indicate a complete charge, but in reality, the battery would have only been charged halfway. Additionally, your car may experience rapid charging and discharging cycles, resembling a decline in battery capacity.


BMS- U018

Maximum battery charge level reduced - BMS- U018
The error message "Maximum battery charge level reduced" will be displayed on both the small and central screens, accompanied by the code BMS-U018 in the error menu. This error indicates an imbalance within the battery, meaning that one or more battery bricks have either lower or higher capacities than they should. To resolve this issue, a battery diagnosis is required to identify the faulty bricks, which will then need to be replaced.



This error is a companion of error BMS-U018. Both of these errors indicate a battery imbalance. This error is most associated with imbalanced power within the battery which could ultimately lead to total battery failure.

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EV's Republic is the trusted choice for Tesla owners seeking reliable HV battery repair, replacement, and upgrade services. Our engineering solutions, prompt service, transparent communication, fair pricing, and passion for electric vehicles provides value to the Tesla community exceeding customer expectations and delivering an unmatched experience. Choose EV's Republic for peace of mind and exceptional service.
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