VCSEC-A303
VCSEC_a303_KeyfobUpdateInterrupted
Also written as VCSEC_A303 / VCSEC A303 / VCSEC_a303_KeyfobUpdateInterrupted / vcsec_a303_keyfobupdateinterrupted
Why does the exact Tesla alert ID matter?
Record the exact alert ID, including underscores, suffixes, and companion alerts. Tesla alerts that look similar can point to different modules, timestamps, and service procedures.
What does VCSEC-A303 mean?
Tesla alert code in the Vehicle Controller Security (VCSEC) module. Security controller could not update a keyfob but may try again The VCSEC has detected that there are no phone-keys connected while driving If there are no phone-keys connected after driving for 250 meters and NFC was not used for authentication User could leave their phone behind and be unable to re-start their vehicle
Original Description
Security controller could not update a keyfob but may try again The VCSEC has detected that there are no phone-keys connected while driving If there are no phone-keys connected after driving for 250 meters and NFC was not used for authentication User could leave their phone behind and be unable to re-start their vehicle
Affected Tesla Models
What You May Notice
- Vehicle Controller Security alert: Security controller could not update a keyfob but may try again The VCSEC has detected that there are no phone-keys conn
- Possible issue with keyless entry or passive entry
- Alert in the Tesla app
How to Diagnose and Resolve
- 1 Reboot the vehicle
- 2 Re-pair your phone key or key card in Controls > Locks
- 3 Schedule service if Sentry Mode or key access remains unreliable
Severity Notes
VCSEC-A303 is an Alert in the Vehicle Controller Security system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.