Sentry IQ / Guides / Sentry Mode not working
Sentry Mode not working? The usual causes, in order.
Updated 19 August 2026
"Not working" usually means one of three different problems: the car will not arm, the car arms but does not record, or the car records but you never hear about it. Find your symptom below and work down the list. The causes are ordered by how often they turn out to be the answer.
It will not arm
- The battery is under 20 percent. Sentry Mode refuses to run below that level, and shuts off if the battery falls to it while armed. Charge first. Details in the battery guide.
- You are parked at an excluded location. If Sentry Mode is set to skip Home, Work or Favorites, it quietly stays off there. Check the Sentry Mode settings on the car's screen and look at where you are parked.
- It was never set to turn on. Sentry Mode is manual by default. It arms when you switch it on, from the screen, the Tesla app, or a voice command, and it does not arm itself. If you want it automatic, you need a schedule.
It arms but does not record
- No usable storage. On most cars Sentry clips go to the USB drive that also holds dashcam footage. If the drive is missing, full, failing, or formatted wrong, Sentry Mode can watch but cannot save. The car's screen shows a dashcam error icon when this happens.
- The drive needs formatting. Use the car's own Format USB drive option in the dashcam settings, which sets up the right filesystem and folders in one tap.
- The drive is quietly dying. Cheap flash drives wear out from constant writing, and the failure mode is silent gaps in your clips. The worst state a security camera can be in is not off. It is looking fine and saving nothing, and you find out the day you actually need the clip. If clips stop appearing where they used to, replace the drive before trusting it again, and check that new clips actually appear after an event; an icon that looks fine is not proof.
It records but never tells you anything
This one is not a fault. The Tesla app only pushes three kinds of Sentry notification: the alarm, a door or trunk opened while locked, and a hard impact. A person circling your car, leaning on it, or denting it in a parking lot is recorded silently. There is no setting to change that; it is the design. The full list is in the notifications guide.
If you want a push for every event, that takes an app on Tesla's official streaming platform. Sentry IQ does exactly this, free: every Sentry event on your phone in seconds, with honk, flash and lock one tap away.
Still stuck?
Reboot the screen (hold both scroll wheels), check for a pending software update, and try a different USB drive before assuming hardware failure. If Sentry Mode misbehaves after an update, it is worth searching the Tesla forums for your exact software version; regressions happen and are usually fixed in the next release.