Keyless Entry - Keyless Entry Limitations

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Keyless Entry Limitations

Make sure your remote control is within 3 ft (1 m) of the front door handles and liftgate.

The system could not function if:

The remote control remains stationary for about a minute.
The vehicle battery has no charge.
The remote control battery has no charge.
There is interference causing issues with the remote control frequencies.
The remote control is too close to metal objects or electronic devices, for example keys or a cell phone.

2021 Mustang Mach-E Owner's Manual