2021 GMC SIERRA Service emission system

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Page 116 of 461

GMC SIERRA 2021  Owners Manual GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Instruments and Controls 115
will light either ON or OFF, or either the on
or off symbo

Page 117 of 461

GMC SIERRA 2021  Owners Manual GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
116 Instruments and Controls
Caution
If the vehicle is driven continually with
this lig

Page 118 of 461

GMC SIERRA 2021  Owners Manual GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Instruments and Controls 117
service the vehicle may affect vehicle
operation. SeeAdd-O

Page 231 of 461

GMC SIERRA 2021  Owners Manual GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
230 Driving and Operating
In an emergency, if the vehicle cannot be
pulled over and mus

Page 233 of 461

GMC SIERRA 2021  Owners Manual GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
232 Driving and Operating
{Warning
Turning off the vehicle while moving may
cause loss

Page 285 of 461

GMC SIERRA 2021  Owners Manual GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
284 Driving and Operating
Recommended Fuel (6.2L
V8 Engine)
Premium unleaded gasoline m

Page 319 of 461

GMC SIERRA 2021  Owners Manual GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
318 Driving and Operating
If Tow/Haul Mode is off and this setting is
on for a Trailer

Page 324 of 461

GMC SIERRA 2021  Owners Manual GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Vehicle Care 323
Accessories and Modifications
Adding non-dealer accessories or making