A flurry of Twitter users complained on Monday that they were locked out of their Tesla cars and left stranded after its app stopped working.

Some drivers tweeted screenshots of the app, which showed a warning message that said: "Temporary Maintenance. Please try again later."

One of Tesla's selling features is that you can use the app to unlock your car, meaning you don't need to travel with the key. A representative for Tesla told Business Insider that she recommends customers carry a key as the app is not the primary way to unlock the car.

Tesla said that the app was only down briefly around 4 pm PST.

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Several Tesla owners were locked out of their cars on Monday and left stranded after the app stopped working.

The panicked drivers took to Twitter to complain and tweeted at Tesla and Elon Musk to ask what was going on:

Some drivers tweeted screenshots of the app, which showed a warning message that said: "Temporary Maintenance. Please try again later."

One of Tesla's selling features is that you can use the app to unlock your car and don't need to travel with the key. However, a representative for Tesla told Business Insider that the key is still the primary way of using the car and she recommends that customers always carry it in case their phone cuts out, for example.

Model 3 owners have a third way to unlock their Tesla by using the "phone-as-key" function, which connects to the car via Bluetooth and works separately from the app. If the app is down, customers would still be able to use this service.

Tesla said that the app was down at around 4 pm PST on Monday and was only briefly unavailable.