If a signal strength bar displays an exclamation point, the modem timed out. If the modem times out for longer than 180 seconds, a Modem Not Responding message displays.
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Possible causes are:
There is no subscriber identity module (SIM) card in modem.
There is no cellular network available.
There is a bad modem connection or harness failure.
The modem is busy (for example, while transmitting data).
More repair case for John Deere,please refer to:John Deere Trouble Repair
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