check engine CHEVROLET TAHOE 2020 Service Manual

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13566622) - 2020 - CRC - 4/15/19
382 Service and Maintenance
The Tire Rotation and Required
Services are the responsibility of the
vehicle owner. It is recommended to
have your dealer perform these
services every 12 000 km/7,500 mi.
Proper vehicle maintenance helps to
keep the vehicle in good working
condition, improves fuel economy,
and reduces vehicle emissions.
Because of the way people use
vehicles, maintenance needs vary.
There may need to be more
frequent checks and services. The
Additional Required Services -
Normal are for vehicles that:
.Carry passengers and cargo
within recommended limits on
the Tire and Loading Information
label. See Vehicle Load Limits
0 200.
. Are driven on reasonable road
surfaces within legal driving
limits.
. Use the recommended fuel. See
Recommended Fuel (5.3L
V8 Engine) 0257 or
Recommended Fuel (6.2L
V8 Engine) 0257. Refer to the information in the
Maintenance Schedule Additional
Required Services - Normal chart.
The Additional Required Services -
Severe are for vehicles that are:
.
Mainly driven in heavy city traffic
in hot weather.
. Mainly driven in hilly or
mountainous terrain.
. Frequently towing a trailer.
. Used for high speed or
competitive driving.
. Used for taxi, police, or delivery
service.
Refer to the information in the
Maintenance Schedule Additional
Required Services - Severe chart.
{Warning
Performing maintenance work can
be dangerous and can cause
serious injury. Perform
maintenance work only if the
required information, proper tools, (Continued)
Warning (Continued)
and equipment are available.
If they are not, see your dealer to
have a trained technician do the
work. SeeDoing Your Own
Service Work 0286.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13566622) - 2020 - CRC - 4/15/19
Service and Maintenance 383
Maintenance
Schedule
Owner Checks and Services
At Each Fuel Stop
.Check the engine oil level. See
Engine Oil 0293.
Once a Month
. Check the tire inflation
pressures, including the spare.
See Tire Pressure 0337.
. Inspect the tires for wear. See
Tire Inspection 0344.
. Check the windshield washer
fluid level. See Washer Fluid
0 306.
Engine Oil Change
When the CHANGE ENGINE OIL
SOON message displays, have the
engine oil and filter changed within
the next 1 000 km/600 mi. If driven
under the best conditions, the
engine oil life system may not
indicate the need for vehicle service
for up to a year. The engine oil and filter must be changed at least once
a year and the oil life system must
be reset. Your trained dealer
technician can perform this work.
If the engine oil life system is reset
accidentally, service the vehicle
within 5 000 km/3,000 mi since the
last service. Reset the oil life
system when the oil is changed.
See
Engine Oil Life System 0295.
Extended Idle Use
When the vehicle is used in a way
that requires extended idle time,
one hour of use shall be deemed
the same as 53 km (33 mi). See
Driver Information Center (DIC)
(Base Level) 0145 or
Driver Information Center (DIC)
(Uplevel) 0147 for hourmeter.
Air Conditioning Desiccant
(Replace Every Seven Years)
The air conditioning system requires
maintenance every seven years.
This service requires replacement of
the desiccant to help the longevity
and efficient operation of the air
conditioning system. This service
can be complex. See your dealer.
Tire Rotation and Required
Services Every 12 000 km/
7,500 mi
Rotate the tires, if recommended for
the vehicle, and perform the
following services. See Tire
Rotation 0344.
. Check engine oil level and oil
life percentage. If needed,
change engine oil and filter, and
reset oil life system. See Engine
Oil 0293 and
Engine Oil Life System 0295.
. Check engine coolant level. See
Cooling System 0301.
. Check windshield washer fluid
level. See Washer Fluid 0306.
. Check tire inflation pressures,
including the spare. See Tire
Pressure 0337.
. Inspect tire wear. See Tire
Inspection 0344.
. Visually check for fluid leaks.
. Inspect engine air cleaner filter.
See Engine Air Cleaner/Filter
0 300.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13566622) - 2020 - CRC - 4/15/19
Service and Maintenance 385
Maintenance Schedule
Additional Required
Services - Normal12 000 km/7,500 mi
24 000 km/15,000 mi
36 000 km/22,500 mi
48 000 km/30,000 mi
60 000 km/37,500 mi
72 000 km/45,000 mi
84 000 km/52,500 mi
96 000 km/60,000 mi
108 000 km/67,500 mi
120 000 km/75,000 mi
132 000 km/82,500 mi
144 000 km/90,000 mi
156 000 km/97,500 mi
168 000 km/105,000 mi 180 000 km/112,500 mi
192 000 km/120,000 mi
204 000 km/127,500 mi
216 000 km/135,000 mi
228 000 km/142,500 mi
240 000 km/150,000 mi
Rotate tires and perform Required Services.
Check engine oil level and oil life percentage.
Change engine oil and filter, if needed.@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
Replace passenger compartment air filter. (1)@ @@@@@
Inspect evaporative control system. (2)@ @@
Replace engine air cleaner filter. (3)@@@
Change transfer case fluid, if equipped with
4WD. (4)@
Replace spark plugs. Inspect spark plug wires.@
Drain and fill engine cooling system. (5)@
Visually inspect accessory drive belts. (6)@
Replace brake fluid. (7)
Replace windshield wiper blades. (8)
@ @ @ @ @ @ @ @ @ @
Replace hood and/or body lift support gas
struts. (9)@ @
Replace air conditioning desiccant. (10)

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13566622) - 2020 - CRC - 4/15/19
386 Service and Maintenance
Footnotes—Maintenance
Schedule Additional Required
Services - Normal
(1) Or every two years, whichever
comes first. More frequent
passenger compartment air filter
replacement may be needed if
driving in areas with heavy traffic,
poor air quality, high dust levels,
or environmental allergens.
Passenger compartment air filter
replacement may also be needed if
there is reduced airflow, window
fogging, or odors. Your GM dealer
can help determine when to replace
the filter.
(2) Visually check all fuel and vapor
lines and hoses for proper
attachment, connection, routing, and
condition.
(3) Or every four years, whichever
comes first. If driving in dusty
conditions, inspect the filter at each
oil change or more often as needed.
See Engine Air Cleaner/Filter 0300.
(4) Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water can overcome the seals and
contaminate the transfer case fluid.
Contaminated fluid will decrease the
life of the transfer case and/or axles
and should be replaced.
(5)
Or every five years, whichever
comes first. See Cooling System
0 301.
(6) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
(7) Replace brake fluid every five
years. See Brake Fluid 0308.
(8) Or every 12 months, whichever
comes first. See Wiper Blade
Replacement 0312.
(9) Or every 10 years, whichever
comes first. See Gas Strut(s)0314.
(10) Replace air conditioning
desiccant every seven years.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13566622) - 2020 - CRC - 4/15/19
Service and Maintenance 387
Maintenance Schedule
Additional Required
Services - Severe12 000 km/7,500 mi
24 000 km/15,000 mi
36 000 km/22,500 mi
48 000 km/30,000 mi
60 000 km/37,500 mi
72 000 km/45,000 mi
84 000 km/52,500 mi
96 000 km/60,000 mi
108 000 km/67,500 mi
120 000 km/75,000 mi
132 000 km/82,500 mi
144 000 km/90,000 mi
156 000 km/97,500 mi
168 000 km/105,000 mi 180 000 km/112,500 mi
192 000 km/120,000 mi
204 000 km/127,500 mi
216 000 km/135,000 mi
228 000 km/142,500 mi
240 000 km/150,000 mi
Rotate tires and perform Required Services.
Check engine oil level and oil life percentage.
Change engine oil and filter, if needed.@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
Replace passenger compartment air filter. (1)@ @@@@@
Inspect evaporative control system. (2)@ @@
Replace engine air cleaner filter. (3)@@@
Change automatic transmission fluid and filter.@@@
Change transfer case fluid, if equipped with
4WD. (4)@@@
Replace spark plugs. Inspect spark plug wires.@
Drain and fill engine cooling system. (5)@
Visually inspect accessory drive belts. (6)@
Replace brake fluid. (7)
Replace windshield wiper blades. (8)
@ @ @ @ @ @ @ @ @ @
Replace hood and/or body lift support gas
struts. (9)@ @
Replace air conditioning desiccant. (10)

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13566622) - 2020 - CRC - 4/15/19
388 Service and Maintenance
Footnotes—Maintenance
Schedule Additional Required
Services - Severe
(1) Or every two years, whichever
comes first. More frequent
passenger compartment air filter
replacement may be needed if
driving in areas with heavy traffic,
poor air quality, high dust levels,
or environmental allergens.
Passenger compartment air filter
replacement may also be needed if
there is reduced airflow, window
fogging, or odors. Your GM dealer
can help determine when to replace
the filter.
(2) Visually check all fuel and vapor
lines and hoses for proper
attachment, connection, routing, and
condition.
(3) Or every four years, whichever
comes first. If driving in dusty
conditions, inspect the filter at each
oil change or more often as needed.
Engine Air Cleaner/Filter 0300.
(4) Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water can overcome the seals and
contaminate the transfer case fluid.
Contaminated fluid will decrease the
life of the transfer case and/or axles
and should be replaced.
(5)
Or every five years, whichever
comes first. See Cooling System
0 301.
(6) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
(7) Replace brake fluid every five
years. See Brake Fluid 0308.
(8) Or every 12 months, whichever
comes first. See Wiper Blade
Replacement 0312.
(9) Or every 10 years, whichever
comes first. See Gas Strut(s)0314.
(10) Replace air conditioning
desiccant every seven years.Special Application
Services
. Severe Commercial Use
Vehicles Only: Lubricate chassis
components every oil change.
. Have underbody flushing service
performed. See "Underbody
Maintenance" in Exterior Care
0 371.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13566622) - 2020 - CRC - 4/15/19
Service and Maintenance 389
Additional
Maintenance and Care
Your vehicle is an important
investment and caring for it properly
may help to avoid future costly
repairs. To maintain vehicle
performance, additional
maintenance services may be
required.
It is recommended that your dealer
perform these services—their
trained dealer technicians know
your vehicle best. Your dealer can
also perform a thorough
assessment with a multi-point
inspection to recommend when your
vehicle may need attention.
The following list is intended to
explain the services and conditions
to look for that may indicate
services are required.
Battery
The 12-volt battery supplies power
to start the engine and operate any
additional electrical accessories. .
To avoid break-down or failure to
start the vehicle, maintain a
battery with full cranking power.
. Trained dealer technicians have
the diagnostic equipment to test
the battery and ensure that the
connections and cables are
corrosion-free.
Belts
. Belts may need replacing if they
squeak or show signs of
cracking or splitting.
. Trained dealer technicians have
access to tools and equipment
to inspect the belts and
recommend adjustment or
replacement when necessary.
Brakes
Brakes stop the vehicle and are
crucial to safe driving.
. Signs of brake wear may include
chirping, grinding, or squealing
noises, or difficulty stopping. .
Trained dealer technicians have
access to tools and equipment
to inspect the brakes and
recommend quality parts
engineered for the vehicle.
Fluids
Proper fluid levels and approved
fluids protect the vehicle’s systems
and components. See
Recommended Fluids and
Lubricants 0392 for GM approved
fluids.
. Engine oil and windshield
washer fluid levels should be
checked at every fuel fill.
. Instrument cluster lights may
come on to indicate that fluids
may be low and need to be
filled.
Hoses
Hoses transport fluids and should
be regularly inspected to ensure
that there are no cracks or leaks.
With a multi-point inspection, your
dealer can inspect the hoses and
advise if replacement is needed.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13566622) - 2020 - CRC - 4/15/19
Technical Data 397
Vehicle Data
Capacities and Specifications
The following approximate capacities are given in metric and English conversions. SeeRecommended Fluids and
Lubricants 0392 for more information.
Application Capacities
Metric English
Air Conditioning Refrigerant For the air conditioning system refrigerant type and charge amount, see the refrigerant label under thehood. See your dealer for more information.
Engine Cooling System* L83 5.3L Engine 16.8 L 17.8 qt
L86 6.2L Engine 16.8 L 17.8 qt
Engine Oil with Filter 7.6 L 8.0 qt
Fuel Tank Short Wheelbase 98.4 L 26.0 gal
Long Wheelbase 119.2 L 31.5 gal
Transfer Case Fluid 1.5 L 1.6 qt
Wheel Nut Torque 190 Y140 lb ft
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this
manual. Recheck fluid level after filling.
*Engine cooling system capacity values are based on the entire cooling system and its components.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/-
Mexico-13566622) - 2020 - CRC - 4/24/19
Index 425
IndexA
Accessories andModifications . . . . . . . . . . . . . . . . . . 285
Accessory Power . . . . . . . . . . . . . . . 212
Active Fuel Management . . . . . . . 214
Adaptive Cruise Control . . . . . . . . 235
Add-On Electrical Equipment . . . 282
Additional Information OnStar . . . . . . . . . . . . . . . . . . . . . . . 416
Additional Maintenance
and Care . . . . . . . . . . . . . . . . . . . . . . 389
Adjustable Throttle and Brake Pedal . . . . . . . . . . . . . . . . . . . 204
Adjustments
Lumbar, Front Seats . . . . . . . . . . . . 48
Air Cleaner/Filter, Engine . . . . . . . 300
Air Conditioning . . . . . . . . . . . 178, 182
Air Filter, Passenger Compartment . . . . . . . . . . . . . . . . . 184
Air Vents . . . . . . . . . . . . . . . . . . . . . . . 183
Airbag System Check . . . . . . . . . . . . . . . . . . . . . . . . . . 86
How Does an AirbagRestrain? . . . . . . . . . . . . . . . . . . . . . 79
Passenger Sensing System . . . . 81
What Makes an Airbag Inflate? . . . . . . . . . . . . . . . . . . . . . . . . 79 What Will You See after an
Airbag Inflates? . . . . . . . . . . . . . . . 79
When Should an Airbag Inflate? . . . . . . . . . . . . . . . . . . . . . . . . 78
Where Are the Airbags? . . . . . . . . 76
Airbags Adding Equipment to the
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . 85
Passenger Status Indicator . . . 136
Readiness Light . . . . . . . . . . . . . . 136
Servicing Airbag-Equipped Vehicles . . . . . . . . . . . . . . . . . . . . . . . 85
System Check . . . . . . . . . . . . . . . . . . 74
Alarm Vehicle Security . . . . . . . . . . . . . . . . 33
Alert
Lane Change . . . . . . . . . . . . . . . . . 252
Side Blind Zone (SBZA) . . . . . . 252
All-Season Tires . . . . . . . . . . . . . . . . 331
All-Terrain Tires . . . . . . . . . . . . . . . . . 332
Antilock Brake System (ABS) . . . 227 Warning Light . . . . . . . . . . . . . . . . . 140
Appearance Care Exterior . . . . . . . . . . . . . . . . . . . . . . . 371

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/-
Mexico-13566622) - 2020 - CRC - 4/24/19
426 Index
Interior . . . . . . . . . . . . . . . . . . . . . . . . 376
Armrest Storage . . . . . . . . . . . . . . . . 111
Assistance Program,
Roadside . . . . . . . . . . . . . . . . . . . . . . 404
Assistance Systems for Driving . . . . . . . . . . . . . . . . . . . . . . . . 248
Assistance Systems for
Parking and Backing . . . . . . . . . . 244
Automatic Door Locks . . . . . . . . . . . . . . . . . . . . . 25
Emergency Braking (AEB) . . . . 250
Headlamp System . . . . . . . . . . . . 170
Level Control . . . . . . . . . . . . . . . . . 232
Transmission . . . . . . . . . . . . . . . . . 216
Transmission Fluid . . . . . . 296, 299
Automatic Transmission
Manual Mode . . . . . . . . . . . . . . . . . 219
Shift Lock Control FunctionCheck . . . . . . . . . . . . . . . . . . . . . . . .311
Auxiliary Roof Mounted Lamp . . . . . . . . . . 172
Axle, Front . . . . . . . . . . . . . . . . . . . . . . 310
Axle, Rear . . . . . . . . . . . . . . . . . . . . . . 311
B
Battery Exterior Lighting BatterySaver . . . . . . . . . . . . . . . . . . . . . . . 176 Load Management . . . . . . . . . . . . 175
Power Protection . . . . . . . . . . . . . 176
Battery - North America . . . . 309, 363
Blade Replacement, Wiper . . . . . 312
Blind Spot Mirrors . . . . . . . . . . . . . . . 38
Brake Pedal and Adjustable
Throttle . . . . . . . . . . . . . . . . . . . . . . 204
System Warning Light . . . . . . . . 139
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . 307 Antilock . . . . . . . . . . . . . . . . . . . . . . . 227
Assist . . . . . . . . . . . . . . . . . . . . . . . . . 228
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 308
Parking . . . . . . . . . . . . . . . . . . . . . . . 228
Braking . . . . . . . . . . . . . . . . . . . . . . . . . 189 Automatic
Emergency (AEB) . . . . . . . . . . . 250
Break-In, New Vehicle . . . . . . . . . . 204
Bulb Replacement Fog Lamps . . . . . . . . . . . . . . . . . . . 316
Front Turn Signal Lamps . . . . . 316
Halogen Bulbs . . . . . . . . . . . . . . . . 315
Headlamp Aiming . . . . . . . . . . . . . 315
Headlamps . . . . . . . . . . . . . . 315, 316
High Intensity Discharge(HID) Lighting . . . . . . . . . . . . . . . 315
License Plate Lamps . . . . . . . . . 318 Taillamps, Turn Signal,
Stoplamps, and Back-up
Lamps . . . . . . . . . . . . . . . . . . . . . . 317
Buying New Tires . . . . . . . . . . . . . . . 346
C
Calibration . . . . . . . . . . . . . . . . . . . . . . 120
California Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . 285
California Proposition
65 Warning . . . . . . . . . .285, 309, 363,
Back Cover
Canadian Vehicle Owners . . . . . . . . 2
Capacities and Specifications . . . . . . . . . . . . . . . . . 397
Carbon Monoxide Engine Exhaust . . . . . . . . . . . . . . . 215
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . . 27
Winter Driving . . . . . . . . . . . . . . . . 197
Cargo Tie-Downs . . . . . . . . . . . . . . . . . . . . .113
Caution, Danger, and Warning . . . . 2
Center Console Storage . . . . . . . . 112
Center Seat . . . . . . . . . . . . . . . . . . . . . 47
Chains, Tire . . . . . . . . . . . . . . . . . . . . 350