The Tesla Model 3 doesn’t come with a key fob – it’s designed to operate around the smartphone app. With the app, you can remotely operate the locks, as well as set it up to automatically unlock as you near the vehicle, and lock when you walk away from the Model 3.
If you forget this, and do something with your phone that you shouldn’t, your Tesla may not lock and you may be robbed (and thus sentry mode will not be enabled).
I was on a long road trip recently / moved out of my apartment so I had virtually everything in there. All of it got stolen out the trunk, and Sentry Mode recorded nothing because technically the car was unlocked.Reddit user 629afo src
Configure locking alerts on the Stats App
If you use the iOS Stats App, there is a feature that notifies you and locks the car if it notices you are away from your Model 3 and it is unlocked. The app can alert you if you enable the feature. Get the App on the Apple App Store
Leave Bluetooth Enabled
Your phone connects to your Model 3 via bluetooth. If you have bluetooth disabled when you leave your vehicle, your car will not lock when you walk away.
To leave your phone in your car, you need to turn off bluetooth on your phone, or turn your phone onto airplane mode, or turn off/power down your phone all the way.
Don’t leave your phone in your Tesla Model 3 – even for charging
This sounds obvious, as the phone is your key, but if your phone battery is almost dead, it’s easy to leave your phone charging just like you used to in your last vehicle. However, then when you walk away (even if you use the keycard), your phone/key is still in the car.
While I always keep my key card in my pocket, one mistake I make from time to time is leaving my phone in the car. Either charging in the box with the USB ports, or just laying on the seat. If a bad guy came along, he could open the doors, even if I had locked them with the keycard.Reddit user jselbie src
Another Reddit user tells of a time when he left his phone in the car, closed the door to put his kid in, and accidentally locked his kid inside. Anytime you leave your phone in your Model 3 when you aren’t in it can make your life difficult.
Caution when more than one phone enabled as Model 3 Key
If you and your spouse both have your phones set up as keys for the Model 3, then neither one of you can leave your phone in the car – it can cause the same issues as mentioned above
Carry your Tesla Key Card with you
In September 2019, Tesla’s Model 3 app experienced an outage that caused issues. Some owners couldn’t log into the app, others could, but had no cars listed. As a result, those owners couldn’t unlock their vehicles – some for almost 3 and a half hours!
Tesla provides key cards, and this incident is a reminder that it’s a good idea to always have one along.
Just remember – when using the keycard, the car doesn’t automatically lock when you walk away like when you use your phone as key.
You can also buy a Model 3 key fob for $150. The first editions of these didn’t support passive entry like other Tesla vehicle fobs. The current version of the Model 3 key fobs do support passive entry.
Configure multiple driver profiles to disable auto-locking at home
Some Tesla Model 3 owners don’t want their car to autolock when they are parked at home in their garage. There is currently no way to set that up, but there is a clever workaround: create multiple driver profiles.
Use your standard driver profile with autolocking configured, and create a second profile to use at home – and turn off auto-locking for that profile only. In order to prevent using the wrong profile and having auto-locking turned off when you aren’t at home, do something to help remind yourself to switch profiles like setting the seat or mirror position way off for your at-home profile.