Ducati Diavel Carbon Owner's Manual page 127

Entering PIN CODE function for vehicle release
This function turns on the motorcycle "temporarily"
in the case of HF (Hands Free) system
"malfunctions".
To activate the function, press the "emergency"
Hands Free button (7, fig. 90) if the motorcycle
cannot be turned on using the normal starter button.
After pressing the button, the instrument panel
activates the "INSERT PIN CODE" indication on the
display with four dashes "----" in the bottom line
highlighted in green to enter the 4 digit PIN code.
Entering the code:
press the reset button (12, fig. 12).
each time you press the button (2, fig. 14) "▼" the
displayed number increases from "0" to "9" and
then returns to "0";
to confirm the number, press the reset button (12,
fig. 12);
repeat the procedure until inserting the fourth digit;
Press the reset button (12, fig. 12) again to confirm.
If the code is incorrect, the instrument panel will
return to the four dashes " - - - - " indication in order
to enter the code again.
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Note
There is no limit to the number of times the
code can be re-entered; the instrument panel will
turn off automatically 120 seconds after an attempt
to enter the code.
If the entered code was correctly, the message
"CORRECT" will flash on the display for 3 seconds.
After 3 seconds, the instrument panel will return to
the "normal" view (with all indications active).
From this moment, the vehicle can be started using
the start button (Key-On).
Note
The vehicle can be started until a Key-Off is
performed; if the problem still persists upon the next
starting attempt, repeat the procedure from the
beginning in order to start the motorcycle
"temporarily".
Important
If this procedure is necessary in order to start
the vehicle, contact an Authorised Ducati Service
Centre as soon as possible to fix the problem.