Tesla Model S Owners & Service Manuals

Tesla Model S: Troubleshooting

Tesla Model S (2012-2025) Service Manual / Battery System / HV Battery Charge/Discharge - 4th Generation Tool (Out of Vehicle) / Troubleshooting

Charging does not start. The green "Ready" light in the software application is dimmed.

  • Check that the HV power supply is plugged in and turned on.
  • Check the connections at the rear of the charger/interface control box.

Discharging does not start.

  • Review the status box in the software application for information that could be helpful for troubleshooting.
  • Check that the discharger box is plugged in and its power switch is on.
  • Check that the load bank control cable is connected to the rear of the charger/interface control box.

The software application displays "Pack Communication Error!"

  • The emergency stop is engaged.
  • Check the LV connector to the battery pack.

The software application displays the "Safety Fault" light.

  • If the emergency stop is engaged then disengaged, the HV battery is reset. The software application reports a safety fault until the HV battery has completed all internal safety checks. Wait until the "Safety Fault" light is dimmed before continuing.

The software application status box displays HV connection errors.

  • Check for faulty HV connections.
  • Check for an open HVIL connection. Make sure all connections are fully seated--a plug might appear to be inserted without being fully seated.

The software application displays the "BMS Fault" light.

  1. Make sure the system is idle (select the Stop button in the software application if the pack is charging or discharging).
  2. Engage the emergency stop switch, then disengage it.
  3. Close the "Pack Communication Error!" warning in the software application.
  4. Wait until the "Safety Fault" light is dimmed, then try to charge or discharge the battery.
  5. If the BMS Fault light is displayed again, contact Service Engineering for assistance.

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