Automatic Transmission - Chevrolet 4500 HD 2023 Manual

When the exhaust system warning light
comes on, promptly have the vehicle
inspected and serviced at a dealer.
When a malfunction is detected in the SCR
system, the warning and the indicator lights
shown in the table come on. See Vehicle
Messages 0 67, Malfunction Indicator Lamp
(Check Engine Light) 0 54, and Diesel
Exhaust Fluid (DEF) Warning Light 0 61.
When the Diesel Exhaust Fluid (DEF) Tank is
Empty
If the DEF tank is empty and warning and
indicator lights are on, you must follow
below procedure to cancel the vehicle
restriction:
1. Turn the engine control switch to the
LOCK or ACC position, and add DEF.
2. After adding DEF, turn the engine control
switch to ON position.
3. Wait until buzzer stops, warnings and
indicators are turned off.
4. If the buzzer does not stop, return the
engine control switch back to the LOCK
position and add more DEF, and then
start over from step 2 above.
5. Restart the engine.
It may take a while until the warning lights
and indicators turn off and the buzzer stops
after turning the engine control switch to
the ON position.
It is desirable to fill up the tank with DEF to
avoid DEF remaining level warning indication
from reappearing.
When the outside temperature is low, refer
to Adding DEF in Cold Weather. See Driver
Information Center (DIC) 0 64, Brake System
Warning Light (Parking Brake Light) 0 54,
Warning Buzzers 0 72, and Winter Driving
0 125.

Automatic Transmission

On an automatic transmission vehicle, the
driver does not use a clutch pedal when
pulling away, changing gears, or stopping.
Only the selector lever, accelerator pedal,
and brake pedal are used.
Practice learning the characteristics of the
automatic transmission vehicle and how to
correctly operate it. When the vehicle is
stationary, remember to keep the brake
pedal firmly pressed, and if necessary, move
the selector lever in the P or N position and
apply the parking brake.
Driving and Operating
Creep : With the engine running and a gear
position other than P or N selected with the
selector lever, power reaches the wheels
even when the accelerator pedal is not
pressed, causing the vehicle to tend
to move.
Furthermore, the higher the engine speed,
the stronger the creep and the greater the
vehicle's tendency to move.
Starting
Start the engine in either the P or the N
position. The engine should not start in any
other selector position. If it does, something
is wrong. Have your truck checked by your
dealer as soon as possible.
Always apply either the foot brake or the
parking brake before shifting into any
driving position. This will prevent creeping.
The engine should be running at idle when
shifting from P or N to one of the driving
positions. See Selector Lever 0 177.
169