Upload a raw CSV or TXT log file from the powertrain CAN bus.
CSV or TXT file, max 25 MB.
VoltDecode is a diagnostic tool for people with in-depth knowledge of high-voltage battery systems. It is designed to analyze Tesla Model S and Model X Legacy batteries (2012–2020) using raw powertrain CAN-bus log files.
The tool has been primarily tested with logs recorded using SavvyCAN, but any correctly captured raw CAN log should work. Logs can be recorded with the battery installed in a vehicle or from a standalone battery on the bench. An example log file is available to test functionality.
If you only have an OBDLink MX+ Bluetooth OBD dongle, you can try this experimental Android app to log the CAN bus data. If you are missing a lot of values, try running the logging longer.
In addition to many values available through other tools (such as Toolbox or Scan My Tesla), VoltDecode exposes low-level BMS parameters particularly valuable for diagnostics and repair:
These parameters provide deeper insight into battery health, imbalance, degradation, and fault conditions.
If you encounter any issues or have feedback or questions, please contact us using the contact form.
You can upload a log file and immediately view a free preview of the decoded data. Values marked with an asterisk (*) are available after payment. Values marked as NA are not present in the uploaded log file and will remain unavailable after payment.
A single payment of €50 excl. VAT allows decoding of 10 log files from the same battery within a 6-month period. This enables comparison across multiple moments:
Each decoded log consumes one credit. The current number of available credits is shown in the top right corner.
VoltDecode stores no personal data and uses no tracking cookies. Your uploaded log file is stored temporarily. The decoded values are saved as a static page so that you can view them later or share them with others. Older data will be deleted periodically to keep the server clean, so make sure to save your results on your own device if you want to be certain that you can access them later.
VoltDecode translates and decodes the data present in the uploaded CAN log into human-readable values. Interpretation of this data and any actions taken based on it are entirely the responsibility of the user.
Incomplete, corrupted, or incorrectly recorded log files may result in incomplete or incorrect decoded values.