MyTeslaMate
FC family

FC_a140_CA_bmsIncompatible

Unable to charge with CHAdeMO adapter

What does the FC_a140_CA_bmsIncompatible alert mean?

The vehicle is unable to CHAdeMO DC fast charge (FC) because the battery management system (BMS) reports an incompatible protocol version.

What you'll see in your Tesla

  • Unable to charge with CHAdeMO adapter
  • Vehicle software update required

What triggers it

The FC ECU detects that the BMS protocol version is not compatible with the CHAdeMO EVSE.

When it clears

The FC electronic control unit (ECU) detects that the BMS protocol version is compatible with the CHAdeMO electric vehicle supply equipment (EVSE), or the charge cable is disconnected.

Potential impact

DC fast charging is unavailable.

Affected models

Cybertruck Model 3 2017-2023 Model 3 2024+ Model S 2021+ Model X 2021+ Model Y Model Y 2025+

Track your Tesla's alerts automatically

Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.