Mercedes-Benz G-Class 2020 Operator's Manual page 434

432 Display messages and warning/indicator lamps
Display messages Possible causes/consequences and
F
* The red F (USA only) or ! indicator lamp (Canada only) is lit.
(USA only)
!
(Canada only)
Turn On the Ignition to
Release the Parking Brake
You have attempted to release the electric parking brake with the ignition switched off.
Switch on the ignition.
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M M Solutions