VCTRAILER family
VCTRAILER_a204_stcStuckOn
Trailer functionality may be unavailable
What does the VCTRAILER_a204_stcStuckOn alert mean?
The vehicle trailer controller (VCTRAILER) detected current flowing through the Switched-Tank Converter (STC), in either the forward or backward direction, when VCTRAILER expected the STC to be powered off
What you'll see in your Tesla
- Trailer functionality may be unavailable
- Exiting and re-entering vehicle may restore functionality
What triggers it
Measured current through the STC is nonzero while it is commanded off
When it clears
Toggle Trailer Mode OFF and ON
Potential impact
Trailer brakes may be inoperative
Affected models
Cybertruck
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.