VCLEFTS_a172_wsteHtBlckdByMsmtch
Software update required
What does the VCLEFTS_a172_wsteHtBlckdByMsmtch alert mean?
The vehicle has detected at least one electronic control unit (ECU) required to supplement high voltage (HV) battery heating with waste heat running a firmware (software) version that may not be compatible with the firmware installed on the rest of the vehicle. When this occurs, the vehicle controller blocks the supplemental HV battery heating to make sure no ECU required is limited or unavailable due to firmware. May occur after an unsuccessful or incomplete firmware update, and may be resolved through a successful firmware update.
What you'll see in your Tesla
- Software update required
- Schedule service
What triggers it
The vehicle detects at least one ECU required to supplement HV battery heating with waste heat running a different firmware version than expected.
When it clears
The vehicle no longer detects any ECU required to supplement HV battery heating with waste heat running a different firmware version than expected.
Potential impact
Inability to use waste heat to supplement HV battery heating may make charging at colder temperatures limited or unavailable.
Affected models
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.