2020 GMC SIERRA Owner's Manual

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 4/4/19
456 Service and Maintenance
PartGM Part Number ACDelco Part Number
6.6L V8 1262244141-114
Wiper Blades
Driver Side –55 cm (21.7 in) 84578275—
Passenger Side –55 cm (21.7 in) 84578275—

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 4/4/19
Service and Maintenance 457
Maintenance Records
After the scheduled services are performed, record the date, odometer reading, who performed the service, and the
type of services performed in the boxes provided. Retain all maintenance receipts.Date Odometer
Reading Serviced By Services Performed

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 4/4/19
458 Technical Data
Technical Data
Vehicle Identification
Vehicle IdentificationNumber (VIN) . . . . . . . . . . . . . . . 458
Service Parts Identification . . . 458
Vehicle Data
Capacities and Specifications . . . . . . . . . . . . . . . 459
Engine Drive Belt Routing . . . . 462
Vehicle Identification
Vehicle Identification
Number (VIN)
This legal identifier is in the front
corner of the instrument panel, on
the driver side of the vehicle. It can
be seen through the windshield from
outside. The Vehicle Identification
Number (VIN) also appears on the
Vehicle Certification and Service
Parts labels and certificates of title
and registration.
Engine Identification
The eighth character in the VIN is
the engine code. This code
identifies the vehicle's engine,
specifications, and replacement parts. See
“Engine Specifications”
under Capacities and Specifications
0 459 for the vehicle's engine code.
Service Parts
Identification
There may be a large barcode on
the certification label on the center
pillar that you can scan for the
following information:
.
Vehicle Identification
Number (VIN)
. Model designation
. Paint information
. Production options
If there is not a large barcode on
this label, then you will find this
same information on a label inside
of the glove box.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 4/4/19
Technical Data 459
Vehicle Data
Capacities and Specifications
The following approximate capacities are given in metric and English conversions. SeeRecommended Fluids and
Lubricants 0453.
If the vehicle has a diesel engine, see the Duramax diesel supplement.
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*
2.7L L4 Engine –1500 Series 11.8 L 12.4 qt
4.3L V6 Engine –1500 Series 11.5 L 12.2 qt
5.3L V8 Engine –1500 Series (L82) 12.8 L 13.5 qt
5.3L V8 Engine –1500 Series (L84) 13.1 L 13.8 qt
6.2L V8 Engine –1500 Series 12.6 L 13.3 qt
6.6L V8 Gas Engine –2500 Series and 3500 Series (L8T) 15.1 L 15.9 qt
Engine Oil with Filter
2.7L L4 Engine –1500 Series 5.7 L 6.0 qt

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 4/4/19
460 Technical Data
ApplicationCapacities
Metric English
4.3L V6 Engine –1500 Series 5.7 L 6.0 qt
5.3L V8 Engine –1500 Series (L84) 7.6 L 8.0 qt
6.2L V8 Engine –1500 Series 7.6 L 8.0 qt
6.6L V8 Gas Engine –2500 Series and 3500 Series 7.6 L 8.0 qt
Fuel Tank 1500 Series Standard and Short Box (4WD Gas and
Diesel) 90.8 L 24.0 gal
1500 Series Standard and Short Box (2WD Diesel) 83.3 L 22.0 gal
1500 Series Long Box 106.0 L 28.0 gal
2500 Series and 3500 Series Standard Box (Except
Double Cab Diesel) 136.3 L 36.0 gal
2500 Series and 3500 Series Standard Box (Double Cab
Diesel) 111.3 L 29.4 gal
2500 Series and 3500 Series Long Box (Except Regular
Cab Diesel) 136.3 L 28.0 gal
2500 Series and 3500 Series Long Box (Regular Cab
Diesel) 106.0 L 28.0 gal
3500 Series Chassis Cab –Front Tank 89.0 L 23.5 gal

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 4/4/19
Technical Data 461
ApplicationCapacities
Metric English
3500 Series Chassis Cab –Rear Tank 151.4 L 40.0 gal
Transfer Case Fluid (1500 Series Only) 1.5 L 1.6 qt
Transfer Case Fluid (2500 and 3500 Series Only) 2.3 L 2.4 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.
Engine Specifications
Engine VIN CodeSpark Plug Gap
2.7L L4 (L3B) K0.65–0.75 mm (0.026–0.030 in)
4.3L V6 (LV3) H0.95–1.10 mm (0.037–0.043 in)
5.3L V8 (L82) F0.95–1.10 mm (0.037–0.043 in)
5.3L V8 (L84) D0.95–1.10 mm (0.037–0.043 in)
6.2L V8 (L87) L0.95–1.10 mm (0.037–0.043 in)
6.6L V8 (L8T) 70.95–1.10 mm (0.037–0.043 in)
Spark plug gaps are preset by the manufacturer. Re-gapping the spark plug is not recommended and can damage
the spark plug.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 4/4/19
462 Technical Data
Engine Drive Belt Routing
If the vehicle has a diesel engine,
see the Duramax diesel
supplement.
2.7L Engine
4.3L, 5.3L, and 6.2L Engines
6.6L Engine (Single Generator)
6.6L Engine (Dual Generator)

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 4/4/19
Customer Information 463
Customer
Information
Customer Information
Customer SatisfactionProcedure . . . . . . . . . . . . . . . . . . . 463
Customer Assistance Offices . . . . . . . . . . . . . . . . . . . . . . 465
Customer Assistance for Text Telephone (TTY) Users . . . . . 466
Online Owner Center . . . . . . . . . 466
GM Mobility Reimbursement Program . . . . . . . . . . . . . . . . . . . . 466
Roadside Assistance Program . . . . . . . . . . . . . . . . . . . . 467
Scheduling Service Appointments . . . . . . . . . . . . . . . 468
Courtesy Transportation Program . . . . . . . . . . . . . . . . . . . . 469
Collision Damage Repair . . . . . 470
Publication Ordering Information . . . . . . . . . . . . . . . . . . 472
Radio Frequency Statement . . . . . . . . . . . . . . . . . . . 472
Reporting Safety Defects
Reporting Safety Defects tothe United States
Government . . . . . . . . . . . . . . . . . 473
Reporting Safety Defects to the Canadian
Government . . . . . . . . . . . . . . . . . 473
Reporting Safety Defects to General Motors . . . . . . . . . . . . . 474
Vehicle Data Recording and
Privacy
Vehicle Data Recording andPrivacy . . . . . . . . . . . . . . . . . . . . . . 474
Cybersecurity . . . . . . . . . . . . . . . . . 475
Event Data Recorders . . . . . . . . 475
OnStar . . . . . . . . . . . . . . . . . . . . . . . 476
Infotainment System . . . . . . . . . . 476
Customer Information
Customer Satisfaction
Procedure
Your satisfaction and goodwill are
important to your dealer and to
GMC. Normally, any concerns with
the sales transaction or the
operation of the vehicle will be
resolved by your dealer's sales or
service departments. Sometimes,
however, despite the best intentions
of all concerned, misunderstandings
can occur. If your concern has not
been resolved to your satisfaction,
the following steps should be taken:
STEP ONE : Discuss your concern
with a member of dealership
management. Normally, concerns
can be quickly resolved at that level.
If the matter has already been
reviewed with the sales, service,
or parts manager, contact the owner
of your dealership or the general
manager.
STEP TWO : If after contacting a
member of dealership management,
it appears your concern cannot be