VCLEFT family
VCLEFT_a178_caliperStateUnknown
Parking brake requires attention
What does the VCLEFT_a178_caliperStateUnknown alert mean?
Electronic Parking Brake was not able to determine caliper state on boot.
What you'll see in your Tesla
- Parking brake requires attention
- Press park button to reset
What triggers it
Caliper state saved is unknown, corrupted, or mismatches Electronic Parking Brake Monitor
When it clears
Electronic Parking Brake reaches the fully parked or released state
Potential impact
Problem with initializing Electronic Parking Brake
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.