VCFRONT family
VCFRONT_a170_hcmUnderVoltage
Not Available
What does the VCFRONT_a170_hcmUnderVoltage alert mean?
The headlamp control module has detected an electrical problem.
What you'll see in your Tesla
- Not Available
What triggers it
An undervoltage is detected on the left or right headlamp.
When it clears
The headlamp no longer detects an undervoltage.
Potential impact
One or both headlamps may not function.
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
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.