Chevrolet 2003 Silverado 1500 Pickup Owner's Manual page 221

TRANSMISSION HOT
If the transmission fluid temperature becomes high, the
message center will display this message.
When the transmission enters the protection mode, you
may notice a change in the transmission shifting
patterns. When the transmission fluid temperature
returns to normal, the display will turn off and the
transmission shifting patterns will return to normal.
Notice: If you keep driving your vehicle with the
transmission TRANS FLUID HOT message
displayed, you can damage the transmission. This
could lead to costly repairs that may not be covered
under your warranty.
The following situations can cause the transmission to
operate at higher temperatures:
Towing a trailer
Hot outside air temperatures
Hauling a large or heavy load
Low transmission fluid level
High transmission fluid level
Restricted air flow to the radiator and the auxiliary
transmission oil cooler.
A temporary solution to hotter transmission operating
temperatures may be to let the transmission cool down. If
the transmission is operated at higher temperatures on a
frequent basis, see Scheduled Maintenance on page 6-5
for the proper transmission maintenance intervals.
TRANS HOT IDLE ENGINE (Allison
Transmission Only)
If the transmission fluid in the vehicle gets hot, this
message will appear on the DIC, and you will hear a
chime. The chime will stop when the transmission fluid
temperature is less that 265°F (129°C). Driving with
the transmission fluid temperature high can cause
damage to the vehicle. Stop the vehicle and let it idle to
allow the transmission to cool. This message will
clear when the fluid temperature reaches a safe level.
Notice: If you keep driving your vehicle with
the transmission TRANS HOT
...
IDLE ENGINE
message displayed, you can damage the
transmission. This could lead to costly repairs that
may not be covered under your warranty.
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