VCLEFTS_a171_driveBlckdByMsmtch
Software update required
What does the VCLEFTS_a171_driveBlckdByMsmtch alert mean?
The vehicle has detected at least one electronic control unit (ECU) 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 drive to make sure no vehicle functionality 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
- Unable to start vehicle
What triggers it
The vehicle detects at least one ECU required for drive functionality running a different firmware version than expected.
When it clears
The vehicle no longer detects any ECU required for drive functionality running a different firmware version than expected.
Potential impact
Vehicle is unable to drive until the firmware version mismatch is resolved, to make sure no vehicle functionality required for driving is limited or unavailable due to firmware.
Affected models
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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.