Automatic Transmission Fluid Temperature Warning Light; Overdrive Off Light; Lane Departure Warning (Ldw) Light - Chevrolet 4500 HD 2023 Manual

58 Instruments and Controls
If this light comes on while driving, it
indicates that there is a malfunction in the
automatic transmission s electronic control
system. If the warning light is on, see your
dealer for service.
Automatic Transmission Fluid
Temperature Warning Light
This light comes on briefly when the engine
control switch is in the ON position as a
check to show the light is working. It should
go out when the engine is started.
The Automatic Transmission Fluid (ATF)
Temperature warning light comes on if the
ATF temperature is high. This usually occurs
when the transmission is overfilled and may
be accompanied by leakage of fluid from the
transmission breather hose.
If the light stays on, or comes on while
driving, slow down and pull off the road.
Stop the vehicle at a safe place and put the
vehicle in P (Park). With the engine idling,
wait until the light goes off. If the light
goes off, you can drive the vehicle again.
Continuing to drive while this light is on
may damage the transmission. While this
light is on, the transmission cannot operate
in all gears. If you attempt to shift gears,
the vehicle may not continue to move.
If you cannot drive to a dealer immediately,
have the vehicle towed.
Caution
Driving with the ATF warning light
constantly on can cause serious
mechanical damage to the automatic
transmission.
See Automatic Transmission 0 169.

Overdrive Off Light

This light should come on briefly when the
engine control switch is turned on as a
check to make sure the light is working.
It should go out automatically.
This light comes on when the overdrive off
switch on the selector lever is turned on.
Overdrive will not operate even when the
automatic transmission is in D, unless
engine speed is excessive.
Lane Departure Warning (LDW)
Light
If equipped, this light should come on when
the engine control switch is turned to the
ON position, and then should go out after
the engine is started.
The light will come on when the Lane
Departure Warning (LDW) function is turned
off or when there is an LDW malfunction,
and the light will flash when the LDW
activates while driving.
If the light does not turn off, stays
illuminated even though the LDW has not
been turned off, or does not illuminate
when the engine control switch is turned to
the ON position, see your dealer.