MCU family
MCU_w108_ModemFwUpdateFailed
Modem requires service
What does the MCU_w108_ModemFwUpdateFailed alert mean?
Modem firmware update FAILED
What you'll see in your Tesla
- Modem requires service
- No cellular connectivity until modem is serviced
Affected models
Model S 2012-2020
Model X 2015-2020
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.