Ford F53 Owner's Manual page 27

Information Displays
Transmission
Message Action
CHECK TRANS TEMPERATURE The transmission fluid is overheating. This warning
may appear when towing heavy loads or when driving
in a low gear at a high speed for an extended period
of time. Stop your vehicle as soon as safely possible,
turn off the engine and let the transmission cool.
SHIFT TO PARK A reminder to apply the brakes, then shift to park.
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Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing