FC-W144
FC_w144_CA_flybackUnstable
Also written as FC_W144 / FC W144 / FC_w144_CA_flybackUnstable / fc_w144_ca_flybackunstable
Why does the exact Tesla alert ID matter?
Record the exact alert ID, including underscores, suffixes, and companion alerts. Tesla alerts that look similar can point to different modules, timestamps, and service procedures.
What does FC-W144 mean?
Tesla warning code in the Fast Charging (FC) module. This alert was formerly named FC_w144_CA_flybackUnstable_PT? in firmware versions prior to 2017.12. If FC_w144_CA_flybackUnstable_PT? appears on the vehicle or in the logs, update the vehicle firmware to the current version.
Original Description
This alert was formerly named FC_w144_CA_flybackUnstable_PT? in firmware versions prior to 2017.12. If FC_w144_CA_flybackUnstable_PT? appears on the vehicle or in the logs, update the vehicle firmware to the current version.
Affected Tesla Models
What You May Notice
- Fast Charging alert: This alert was formerly named FC_w144_CA_flybackUnstable_PT? in firmware versions prior to 2017.12. If FC_w144_CA_flybac
- Charging speed capped significantly below rated maximum
- Alert shown on the touchscreen when connecting to Supercharger
How to Diagnose and Resolve
- 1 Try a different Supercharger stall to rule out stall-specific issues
- 2 Reboot the vehicle and attempt to reconnect
- 3 Precondition the battery by navigating to a Supercharger in the Tesla app
- 4 Schedule a service appointment if the issue affects multiple chargers
Severity Notes
FC-W144 is a Warning in the Fast Charging system. Schedule service soon. Monitor your vehicle for additional warnings.