2020 CHEVROLET LOW CAB FORWARD key

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500 HD/XD/5500 HD/XD
Owner Manual (GMNA-Localizing-U.S.-13337621) - 2020 - crc - 12/5/18
Driving and Operating 203
When Parking Your Vehicle
The key cannot be removed unless
the selector lever is securely placed
in the P position (key interlock
system). Be sure to place the
selector lever in the P position when
parking the vehicle.
The shift lock system is a system for
safety to prevent incorrect operation
of the automatic transmission. Use it
correctly and drive safely.
If You Cannot Move the Selector
Lever from the P Position
Caution
When the selector cannot be
operated from the P position to
any other position even after
performing the operation below
repeatedly, the shift lock system
may have a failure. Have the
vehicle inspected at your dealer.If you cannot move the selector
lever from the P position after
starting the engine, perform the
following checks:
.
Check that you are firmly
pressing the brake pedal. When
the brake pedal is not pressed,
the shift lock system operates
and the selector lever cannot be
shifted from P to any other
position.
. Check if the area where your
vehicle is parked is not a slope.
. If your vehicle is parked on a
downside slope, the operation of
the selector lever may become
heavy to move. In this case, you
can operate the selector lever
more smoothly by moving the
selector lever towards the front
of the vehicle while pressing the
button. Releasing the Shift Lock in an
Emergency
If moving of the selector lever from
P to another position is still not
possible even after performing the
instructions given in the steps
above, with the brake pedal fully
pressed and the vehicle parked on a
flat surface, carry out the procedure
described under
“If You Cannot
Move the Selector Lever from the P
Position”.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500 HD/XD/5500 HD/XD
Owner Manual (GMNA-Localizing-U.S.-13337621) - 2020 - crc - 12/5/18
230 Vehicle Care
General Information
Your authorized dealer has trained
technicians and genuine parts to
service your vehicle properly. For
expert advice and quality service,
see your authorized dealer.
California Proposition
65 Warning
{Warning
Most motor vehicles, including
this one, as well as many of its
service parts and fluids, contain
and/or emit chemicals known to
the State of California to cause
cancer and birth defects or other
reproductive harm. Engine
exhaust, many parts and
systems, many fluids, and some
component wear by-products
contain and/or emit these
chemicals. For more information
go to www.P65Warnings.ca.gov/
passenger-vehicle.See
Battery - North America 0259,
Jump Starting - North America
0 301, Engine Exhaust 0168, and
the back cover.
California Perchlorate
Materials Requirements
Certain types of automotive
applications, such as airbag
initiators, seat belt pretensioners,
and lithium batteries contained in
remote keyless transmitters, may
contain perchlorate materials.
Special handling may be necessary.
For additional information, see
www.dtsc.ca.gov/hazardouswaste/
perchlorate.
Accessories and
Modifications
Factory-Approved Accessories
Your dealer can furnish a wide
range of comfort, convenience, and
safety accessories, especially
designed for you and your new
truck. They can install all of the
safety accessories you will need to comply with local, state and D.O.T.
regulations and advise you how to
comply with these regulations.
Be sure to ask your authorized
dealer about the accessories.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500 HD/XD/5500 HD/XD
Owner Manual (GMNA-Localizing-U.S.-13337621) - 2020 - crc - 12/5/18
Vehicle Care 231
Vehicle Checks
Doing Your Own
Service Work
Precautions for Checking and
Adjustments
Your authorized dealer has trained
technicians and genuine parts to
service your vehicle properly. For
expert advice and quality service,
see your authorized dealer.
{Warning
To help avoid personal injury, take
care when doing any
maintenance or making any
check or repair. Follow
manufacturer's instructions for all
materials used during service and
maintenance of this vehicle.
If used or handled improperly,
they may be hazardous. Improper
or incomplete service can also
affect the vehicle and result in(Continued)
Warning (Continued)
personal injury, or damage to the
vehicle or its equipment. If you
have any questions about
carrying out some service, have
the work done by a skilled
technician.
To prevent personal injury, keep
hands, tools and clothing clear of
the engine cooling fan when the
engine is running.
The engine, exhaust pipe and
radiator will be hot immediately
after the vehicle is driven. Be
careful around these parts to
prevent burns. Perform all checks
when the engine is cold.
Do not perform work near an
open flame or other heat sources.
Do not let the engine run in poorly
ventilated garages or sheds. This
could cause carbon monoxide
poisoning.(Continued)
Warning (Continued)
Performing maintenance work on
a truck or chassis can be
dangerous. In trying to do some
jobs, you can be seriously injured.
Do your own maintenance work
only if you have the required
know-how and the proper tools
and equipment for the job. If you
have any doubts, contact your
dealer.
You and others could be seriously
injured.
Pull firmly on the parking brake
lever and move the selector lever to
"P" and make sure the shift indicator
displays "P".
Make sure to turn off the engine and
remove the key from the engine
control switch before performing any
checks.
Select a place with a solid and level
surface to perform the checking and
maintenance work. Make sure to

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500 HD/XD/5500 HD/XD
Owner Manual (GMNA-Localizing-U.S.-13337621) - 2020 - crc - 12/5/18
282 Vehicle Care
Relay LocationRelay locations:
No. Description
1 STOP LAMP
2 DAYTIME RUNNING LAMP
3 KEY ON
4 PARKING/NEUTRAL
5 –
6 WIPER MAIN
7 HORN
8 WIPER HI LO
9 TRAILER BRAKE
10 POWER WINDOW
11 BACK UP LAMP
12 POWER WINDOW
13 HEAD LAMP LO
14 VACUUM PUMP
15 HEAD LAMP HI
16 TAIL LAMP
17 CIGAR LIGHTER
18 CORNERING LAMP

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500 HD/XD/5500 HD/XD
Owner Manual (GMNA-Localizing-U.S.-13337621) - 2020 - crc - 12/5/18
Vehicle Care 311
can cause serious damage to the
engine and its components,
particularly the fuel supply pump.
Handling the Radiator and
Charge Air Cooler
Cleaning the Radiator Core and
Charge Air Cooler Core
Cooling efficiency is compromised
when there is dirt or dust plugging
air passages in the radiator core
and charge air cooler core (diesel).This can also cause corrosion of
these cores. Wash the radiator core
with tap water every 24 months.
Make sure to turn the engine off and
remove the key from the engine
control switch before cleaning
cores.
The engine, exhaust pipe, and
radiator will be hot immediately after
the vehicle is driven. Be careful
around these parts to prevent burns.
Clean the engine when it is cold.
Do not clean the radiator, charge air
cooler (diesel) and their surrounding
areas using water that is supplied
under high pressure. Doing so may
cause damage.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500 HD/XD/5500 HD/XD
Owner Manual (GMNA-Localizing-U.S.-13337621) - 2020 - crc - 12/5/18
368 Index
Fluid (cont'd)Power Steering . . . . . . . . . . . . . . . 252
Washer . . . . . . . . . . . . . . . . . . . . . . . 252
Frequency Statement
Radio . . . . . . . . . . . . . . . . . . . . . . . . . 362
Front Seat Position Seats Adjustment . . . . . . . . . . . . . . . . . . . . . 26
Fuel Biodiesel . . . . . . . . . . . . . . . . . . . . . 219
Cold Weather Operation . . . . . . 221
Diesel Engines . . . . . . . . . . . . . . . 218
Economy, Driving for Better . . . 129
Filling the Tank . . . . . . . . . . . . . . . 225
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Running out of Fuel . . . . . . . . . . . 224
Water in Fuel . . . . . . . . . . . . . . . . . 221
Fuel for Diesel Engines . . . . . . . . . 218
G
Gauges
Diesel Exhaust Fluid (DEF) . . . . . 60
Engine Coolant Temperature . . . 60
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Odometer . . . . . . . . . . . . . . . . . . . . . . . 58
Speedometer . . . . . . . . . . . . . . . . . . . 58
Tachometer . . . . . . . . . . . . . . . . . . . . . 59
Trip Odometer . . . . . . . . . . . . . . . . . . 58 Gauges (cont'd)
Warning Lights and
Indicators . . . . . . . . . . . . . . . . . . . . . 56
General Information
Vehicle Care . . . . . . . . . . . . . . . . . . 230
Getting In and Out of the Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . 17
Glove Box . . . . . . . . . . . . . . . . . . . . . . . 43
GM Mobility Reimbursement Program . . . . . . . . . . . . . . . . . . . . . . . 358
H
Hazard Warning Flashers . . . . . . . . 82
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . 267
Bulb Replacement . . . . . . . 267, 270
Daytime Running Lamps(DRL) Indicator Light . . . . . . . . . . 69
Flash-to-Pass . . . . . . . . . . . . . . . . . . . 81
High-Beam On Light . . . . . . . . . . . . 69
High/Low Beam Changer . . . . . . . 81
Heated Mirrors . . . . . . . . . . . . . . . . . . . 22
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . 163
Heating . . . . . . . . . . . . . . . . . . . . . . . . . 121
High Idle System . . . . . . . . . . . . . . . 165
High-Beam On Light . . . . . . . . . . . . . 69
Hill and Mountain Roads . . . . . . . . 141 Hooks
Shopping Bag . . . . . . . . . . . . . . . . . . 45
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
I
Idle Shutdown . . . . . . . . . . . . . . . . . . 164
Idle Shutdown Light . . . . . . . . . . . . . 68
Ignition Positions . . . . . . . . . . . . . . . 157
Information Publication Ordering . . . . . . . . . . 362
Information on Loading the
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . 46
Instrument Cluster . . . . . . . . . . . . . . . 57
Instrument Panel Storage Area . . . . . . . . . . . . . . . . . . . 43
Instrument Panel
Overview . . . . . . . . . . . . . . . . . 8, 10, 11
Introduction . . . . . . . . . . . . . . . . . . . . . . . 2
J
Jump Starting - North America . . . . . . . . . . . . . . . . . . . . . . . 301
K
Keyless EntryRemote (RKE) System . . . . . . . . . 14
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500 HD/XD/5500 HD/XD
Owner Manual (GMNA-Localizing-U.S.-13337621) - 2020 - crc - 12/5/18
370 Index
P
ParkingBrake . . . . . . . . . . . . . . . . . . . . . . . . . .211
Over Things That Burn . . . . . . . 167
Passenger Compartment Air
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Pedals . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Perchlorate Materials Requirements, California . . . . . . 230
Phone
Bluetooth . . . . . . . . . . . . . . . . . . . . . . 111
Port USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Power
Door Locks . . . . . . . . . . . . . . . . . . . . . 21
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . 55
Reduced Engine Light . . . . . . . . . . 69
Steering Fluid . . . . . . . . . . . . . . . . . 252
Windows . . . . . . . . . . . . . . . . . . . . . . . 23
Power Take-Off (PTO) . . . . . . . . . . 227
Pregnancy, Using Seat Belts . . . . 35
Privacy Vehicle Data Recording . . . . . . . 363
Proposition
65 Warning,
California . . . . . . . . . . . .230, 259, 301, Back CoverPublication Ordering
Information . . . . . . . . . . . . . . . . . . . . 362
R
Radio Frequency Statement . . . . 362
Radio Reception . . . . . . . . . . . . . . . . . 89
Radios
AM-FM Radio . . . . . . . . . . . . . . . . . . . 85
Rear Axle . . . . . . . . . . . . . . . . . . 261, 262
Rear Seats . . . . . . . . . . . . . . . . . . . . . . 30
Rear Storage . . . . . . . . . . . . . . . . . . . . 45
Recommended Fluids and Lubricants . . . . . . . . . . . . . . . . . . . . . 339
Reduced Engine Power Light . . . . 69
Reimbursement Program, GM Mobility . . . . . . . . . . . . . . . . . . . 358
Remote Keyless Entry (RKE)
System . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacement Parts Maintenance . . . . . . . . . . . . . . . . . . 341
Reporting Safety Defects
General Motors . . . . . . . . . . . . . . . 363
U.S. Government . . . . . . . . . . . . . 363
Roads Driving, Wet . . . . . . . . . . . . . . . . . . 140
Roadside Assistance
Program . . . . . . . . . . . . . . . . . . . . . . . 358
Roofmarker Lamps . . . . . . . . . . . . . 274 Rotation, Tires . . . . . . . . . . . . . . . . . . 297
Routing, Engine Drive Belt . . . . . . 355
Running out of Fuel . . . . . . . . . . . . . 224
Running the Vehicle While
Parked . . . . . . . . . . . . . . . . . . . . . . . . 170
S
Safety Defects ReportingGeneral Motors . . . . . . . . . . . . . . . 363
U.S. Government . . . . . . . . . . . . . 363
Safety System Check . . . . . . . . . . . . 37
Scheduling Appointments . . . . . . . 359
Seat Belts . . . . . . . . . . . . . . . . . . . . . . . 31 Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Extender . . . . . . . . . . . . . . . . . . . . . . . . 37
Lap Belt . . . . . . . . . . . . . . . . . . . . . . . . 36
Reminders . . . . . . . . . . . . . . . . . . . . . . 60
Three-Point . . . . . . . . . . . . . . . . . . . . . 33
Use During Pregnancy . . . . . . . . . . 35
Seats Position, Front . . . . . . . . . . . . . . . . . . 26
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Security Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . 21
Selector Lever . . . . . . . . . . . . . . . . . . 205
Service . . . . . . . . . . . . . . . . . . . . . . . . . 126 Accessories andModifications . . . . . . . . . . . . . . . . 230