warning CHEVROLET SILVERADO 2020 Owner's Manual

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
Vehicle Care 323
Vehicle Care
General Information
General Information . . . . . . . . . . 324
California Proposition65 Warning . . . . . . . . . . . . . . . . . 325
California Perchlorate Materials Requirements . . . . . 325
Accessories and Modifications . . . . . . . . . . . . . . . . 325
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . 326
Hood . . . . . . . . . . . . . . . . . . . . . . . . . 326
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . . 328
Engine Oil . . . . . . . . . . . . . . . . . . . . 335
Engine Oil Life System . . . . . . . 337
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . . . 339
Engine Air Filter Life System . . . . . . . . . . . . . . . . . . . . . . 339
Engine Air Cleaner/Filter . . . . . . 340
Cooling System . . . . . . . . . . . . . . 342
Engine Overheating . . . . . . . . . . 347
Overheated Engine Protection Operating Mode . . . . . . . . . . . . . 348
Engine Fan . . . . . . . . . . . . . . . . . . . 349 Power Steering Fluid . . . . . . . . . 350
Washer Fluid . . . . . . . . . . . . . . . . . 350
Brakes . . . . . . . . . . . . . . . . . . . . . . . 351
Brake Pad Life System . . . . . . . 352
Brake Fluid . . . . . . . . . . . . . . . . . . . 353
Battery - North America . . . . . . 354
Four-Wheel Drive . . . . . . . . . . . . . 356
Front Axle . . . . . . . . . . . . . . . . . . . . 357
Rear Axle . . . . . . . . . . . . . . . . . . . . 357
Noise Control System . . . . . . . . 357
Starter Switch Check . . . . . . . . . 358
Automatic Transmission Shift
Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . 359
Ignition Transmission Lock Check . . . . . . . . . . . . . . . . . . . . . . . 359
Park Brake and P (Park) Mechanism Check . . . . . . . . . . 359
Wiper Blade Replacement . . . . 360
Glass Replacement . . . . . . . . . . 361
Windshield Replacement . . . . . 361
Gas Strut(s) . . . . . . . . . . . . . . . . . . 361
Headlamp Aiming
Front Headlamp Aiming . . . . . . 362
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 362
Halogen Bulbs . . . . . . . . . . . . . . . . 362
LED Lighting . . . . . . . . . . . . . . . . . 363 Headlamps, Front Turn Signal,
Sidemarker, and Parking
Lamps . . . . . . . . . . . . . . . . . . . . . . 363
Taillamps, Turn Signal, Stoplamps, and Back-Up
Lamps . . . . . . . . . . . . . . . . . . . . . . 364
Center High-Mounted Stoplamp (CHMSL) and
Cargo Lamp . . . . . . . . . . . . . . . . . 365
License Plate Lamp . . . . . . . . . . 366
Electrical System
Electrical System Overload . . . 366
Fuses and Circuit Breakers . . . 366
Engine Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 367
Instrument Panel Fuse
Block (Left) . . . . . . . . . . . . . . . . . 370
Instrument Panel Fuse Block (Right) . . . . . . . . . . . . . . . . . . . . . . 372
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 375
All-Season Tires . . . . . . . . . . . . . . 375
Winter Tires . . . . . . . . . . . . . . . . . . 376
Low-Profile Tires . . . . . . . . . . . . . 376
All-Terrain Tires . . . . . . . . . . . . . . . 377
Tire Sidewall Labeling . . . . . . . . 377
Tire Designations . . . . . . . . . . . . . 379
Tire Terminology andDefinitions . . . . . . . . . . . . . . . . . . 381

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
Vehicle Care 325
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 0354
and
Jump Starting - North America
0 415 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
electronic keys, may contain
perchlorate materials. Perchlorate
Material –special handling may
apply. See www.dtsc.ca.gov/
hazardouswaste/perchlorate.
Accessories and
Modifications
Adding non-dealer accessories or
making modifications to the vehicle
can affect vehicle performance and
safety, including such things as
airbags, braking, stability, ride and
handling, emissions systems,
aerodynamics, durability, and
electronic systems like antilock
brakes, traction control, and stability
control. These accessories or
modifications could even cause
malfunction or damage not covered
by the vehicle warranty. Damage to suspension components
caused by modifying vehicle height
outside of factory settings will not be
covered by the vehicle warranty.
Damage to vehicle components
resulting from modifications or the
installation or use of non-GM
certified parts, including control
module or software modifications, is
not covered under the terms of the
vehicle warranty and may affect
remaining warranty coverage for
affected parts.
GM Accessories are designed to
complement and function with other
systems on the vehicle. See your
dealer to accessorize the vehicle
using genuine GM Accessories
installed by a dealer technician.
Also, see
Adding Equipment to the
Airbag-Equipped Vehicle 080.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
326 Vehicle Care
Vehicle Checks
Doing Your Own
Service Work
{Warning
It can be dangerous to work on
your vehicle if you do not have
the proper knowledge, service
manual, tools, or parts. Always
follow owner’s manual procedures
and consult the service manual
for your vehicle before doing any
service work.
If doing some of your own service
work, use the proper service
manual. It tells you much more
about how to service the vehicle
than this manual can. To order the
proper service manual, see
Publication Ordering Information
0 467.
This vehicle has an airbag system.
Before attempting to do your own
service work, see Servicing the
Airbag-Equipped Vehicle 080. If equipped with remote vehicle
start, open the hood before
performing any service work to
prevent remote starting the vehicle
accidentally. See
Remote Vehicle
Start 024.
Keep a record with all parts receipts
and list the mileage and the date of
any service work performed. See
Maintenance Records 0452.
Caution
Even small amounts of
contamination can cause damage
to vehicle systems. Do not allow
contaminants to contact the fluids,
reservoir caps, or dipsticks.
Hood
{Warning
For vehicles with auto engine
stop/start, turn the vehicle off
before opening the hood. If the
(Continued)
Warning (Continued)
vehicle is on, the engine will start
when the hood is opened. You or
others could be injured.
{Warning
Components under the hood can
get hot from running the engine.
To help avoid the risk of burning
unprotected skin, never touch
these components until they have
cooled, and always use a glove or
towel to avoid direct skin contact.
Clear any snow from the hood
before opening.
To open the hood: 1. Pull the hood release lever with the
isymbol. It is on the
lower left side of the instrument
panel.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
Vehicle Care 327
2. Go to the front of the vehicleand locate the secondary
release lever under the front
center of the hood. Push the
secondary hood release lever
to the right to release.
3. After you have partially lifted the hood, the gas strut system
will automatically lift the hood
and hold it in the fully open
position.
To close the hood: 1. Before closing the hood, be sure all filler caps are on
properly, and all tools are
removed. 2. Pull the hood down until the
strut system is no longer
holding up the hood.
3. Allow the hood to fall. Check to make sure the hood is latched
completely. Repeat this
process with additional force if
necessary.
{Warning
Do not drive the vehicle if the
hood is not latched completely.
The hood could open fully, block
your vision, and cause a crash.
You or others could be injured.
Always close the hood completely
before driving.
The Driver Information Center (DIC)
will display a message if the hood is
not fully closed, and the vehicle is
moving. Stop and turn off the
vehicle, check the hood for
obstructions, and close the hood
again. Check to see if the message
still appears on the DIC.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
Vehicle Care 335
1. Remote Negative (–) Location.See Jump Starting - North
America 0415.
2. Positive (+) Terminal (Under Cover). See Jump Starting -
North America 0415.
3. Battery - North America 0354.
4. Engine Air Cleaner/Filter 0340.
5. Engine Oil Dipstick. See “Checking Engine Oil” under
Engine Oil 0335.
6. Engine Cooling Fan (Out of View). See Cooling System
0 342.
7. Power Steering Fluid Reservoir. See Power Steering
Fluid 0350.
8. Engine Oil Fill Cap. See “When
to Add Engine Oil” under
Engine Oil 0335.
9. Auxiliary Battery. Battery -
North America 0354.
10. Brake Fluid Reservoir. See Brake Fluid 0353.
11. Engine Compartment Fuse
Block 0367. 12. Coolant Surge Tank and
Pressure Cap. See Cooling
System 0342.
13. Windshield Washer Fluid Reservoir. See “Adding Washer
Fluid” under Washer Fluid
0 350.
If the vehicle has a diesel engine,
see the Duramax diesel
supplement.
Engine Oil
For diesel engine vehicles, see
“Engine Oil” in the Duramax diesel
supplement.
To ensure proper engine
performance and long life, careful
attention must be paid to engine oil.
Following these simple, but
important steps will help protect
your investment:
. Use engine oil approved to the
proper specification and of the
proper viscosity grade. See
“Selecting the Right Engine Oil”
in this section. .
Check the engine oil level
regularly and maintain the
proper oil level. See “Checking
Engine Oil” and“When to Add
Engine Oil” in this section.
. Change the engine oil at the
appropriate time. See Engine Oil
Life System 0337.
. Always dispose of engine oil
properly. See “What to Do with
Used Oil” in this section.Checking Engine Oil
Check the engine oil level regularly,
every 650 km (400 mi), especially
prior to a long trip. The engine oil
dipstick handle is a loop. See
Engine Compartment Overview
0328 for the location.
{Warning
The engine oil dipstick handle
may be hot; it could burn you.
Use a towel or glove to touch the
dipstick handle.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
Vehicle Care 337
Specification
Use full synthetic engine oils that
meet the dexos1 specification.
Engine oils that have been
approved by GM as meeting the
dexos1 specification are marked
with the dexos1 approved logo.
Caution
Failure to use the recommended
engine oil or equivalent can result
in engine damage not covered by
the vehicle warranty.
Viscosity Grade
Use SAE 0W-20 viscosity grade
engine oil for the 5.3L and 6.2L
V8 engines. Use SAE 5W-30 viscosity grade
engine oil for the 2.7L L4, 4.3L
V6 and 6.6L V8 engines. Cold
Temperature Operation: In an area
of extreme cold, where the
temperature falls below
−29 °C
(−20 °F), use SAE 0W-30 oil. An oil
of this viscosity grade will provide
easier cold starting for the engine at
extremely low temperatures.
When selecting an oil of the
appropriate viscosity grade, it is
recommended to select an oil of the
correct specification. See
“Specification” earlier in this section.
Engine Oil Additives/Engine
Oil Flushes
Do not add anything to the oil. The
recommended oils meeting the
dexos1 specification are all that is
needed for good performance and
engine protection.
Engine oil system flushes are not
recommended and could cause
engine damage not covered by the
vehicle warranty.
What to Do with Used Oil
Used engine oil contains certain
elements that can be unhealthy for
your skin and could even cause
cancer. Do not let used oil stay on
your skin for very long. Clean your
skin and nails with soap and water,
or a good hand cleaner. Wash or
properly dispose of clothing or rags
containing used engine oil. See the
manufacturer's warnings about the
use and disposal of oil products.
Used oil can be a threat to the
environment. If you change your
own oil, be sure to drain all the oil
from the filter before disposal. Never
dispose of oil by putting it in the
trash or pouring it on the ground,
into sewers, or into streams or
bodies of water. Recycle it by taking
it to a place that collects used oil.
Engine Oil Life System
When to Change Engine Oil
This vehicle has a computer system
that indicates when to change the
engine oil and filter. This is based
on a combination of factors which

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
Vehicle Care 341
2. Disconnect the outlet duct byloosening the air duct
clamp (1).
3. Disconnect the electrical harness connector (2) from the
cover.
4. Remove the three screws on top of the cover of the housing,
then slide and lift the cover.
5. Lift and remove the engine air cleaner/filter.
6. Lightly tap and shake the engine air cleaner/filter, away
from the vehicle, to release
loose dust and dirt. Replace
the engine air filter if damaged.
7. Reverse steps 2–5 to reinstall the engine air cleaner/filter
cover housing.
8. If equipped, reset the engine air filter life system after
replacing the engine air filter.
See Engine Air Filter Life
System 0339.
6.6L V8 Engine (L8T)
1. Locate the air cleaner/filter assembly. See Engine
Compartment Overview 0328.
2. Remove the eight screws on top of the cover of the housing,
then lift the cover.
3. Remove the engine air cleaner/ filter from the housing. Take
care to dislodge as little dirt as
possible.
4. Clean the engine air cleaner/ filter sealing surfaces and the
housing.
5. Inspect or replace the engine air cleaner/filter. 6. Reverse Steps 2–4 to reinstall
the filter cover housing.
7. If equipped, reset the engine air filter life system after
replacing the engine air filter.
see Engine Air Filter Life
System 0339.
{Warning
Operating the engine with the air
cleaner/filter off can cause you or
others to be burned. Use caution
when working on the engine. Do
not start the engine or drive the
vehicle with the air cleaner/filter
off, as flames may be present if
the engine backfires.
Caution
If the air cleaner/filter is off, dirt
can easily get into the engine,
which could damage it. Always
have the air cleaner/filter in place
when driving.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
342 Vehicle Care
Cooling System
If the vehicle has the Duramax
diesel engine, see the Duramax
diesel supplement.
The cooling system allows the
engine to maintain the correct
working temperature.
2.7L L4 Engine (L3B)
4.3L V6 Engine (LV3)5.3L V8 Engine (L84) Shown, 5.3LV8 Engine (L82) and 6.2LV8 Engine (L87) Similar
1. Engine Electric Cooling Fans (Out of View)
2. Coolant Surge Tank and Pressure Cap
{Warning
An underhood electric fan can
start up even when the engine is
not running and can cause injury.
Keep hands, clothing, and tools
away from any underhood
electric fan.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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Vehicle Care 343
6.6L V8 Engine (L8T)
1. Engine Cooling Fan (Outof View)
2. Coolant Surge Tank and Pressure Cap
{Warning
Do not touch heater, radiator, a/c
pipes or hoses, or other engine
parts. They can be very hot and
can burn you. Do not run the
engine if there is a leak; all
coolant could leak out. That could
(Continued)
Warning (Continued)
cause an engine fire and can
burn you. Fix any leak before
driving the vehicle.
Engine Coolant
The cooling system in the vehicle is
filled with DEX-COOL engine
coolant. This coolant is designed to
remain in the vehicle for 5 years or
240 000 km (150,000 mi), whichever
occurs first.
The following explains the cooling
system and how to check and add
coolant when it is low. If there is a
problem with engine overheating,
seeEngine Overheating 0347.
What to Use
{Warning
Plain water, or other liquids such
as alcohol, can boil before the
proper coolant mixture will. With
(Continued)
Warning (Continued)
plain water or the wrong mixture,
the engine could get too hot but
there would not be an overheat
warning. The engine could catch
fire and you or others could be
burned.
Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant. This mixture:
. Gives freezing protection down
to−37 °C (−34 °F), outside
temperature.
. Gives boiling protection up to
129 °C (265 °F), engine
temperature.
. Protects against rust and
corrosion.
. Will not damage aluminum parts.
. Helps keep the proper engine
temperature.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
13337620) - 2020 - CTC - 1/27/20
Vehicle Care 345
Automatic Coolant Service Fill
Instructions (L3B Engine)
See 3.0L Duramax Diesel
supplement for the diesel engine
procedure.
If equipped, this feature assists in
filling and removing air from the
cooling system after service of
components or when coolant is
added after being too low.
To activate the fill and air removal
process:1. With a cold system, add coolant to the indicated mark
on the surge tank.
2. Replace the cap on the surge tank.
3. Connect the vehicle to a battery charger.
4. Set the ignition to Service or Accessory Mode. See Ignition
Positions (Keyless Access)
0 205 or
Ignition Positions (Key Access)
0 207.
5. Turn off the air conditioning. 6. Set the parking brake.
7. At the same time, press the
accelerator and the brake for
automatic transmission
vehicles for two seconds, then
release.
At the end of the cycle, check the
coolant level in the surge tank and
add coolant if it is low. Turn off the
vehicle, allow the Electronic Control
Module (ECM) to go to sleep, about
two minutes, and repeat Steps 3–7.
Listen for pump activation and
movement of the control valves
while watching the level of the
coolant in the surge tank. If the tank
empties, turn the ignition off,
carefully remove the surge tank cap,
refill to the indicated mark, and
repeat Steps 3–6. The fill and air
removal process will run for
approximately 10 minutes.
How to Add Coolant to the
Coolant Surge Tank for
Gasoline Engines Except L3B
If the vehicle has a diesel engine,
see “Cooling System” in the
Duramax diesel supplement for the
proper coolant fill procedure.
{Warning
Spilling coolant on hot engine
parts can burn you. Coolant
contains ethylene glycol and it will
burn if the engine parts are hot
enough.
{Warning
Plain water, or other liquids such
as alcohol, can boil before the
proper coolant mixture will. With
plain water or the wrong mixture,
the engine could get too hot but
there would not be an overheat
(Continued)