GMC Sierra Owners Manuals

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California Fuel Requirements
If the vehicle is certified to meet California Emissions Standards, it is designed to operate on fuels that meet California specifications. See the underhood emission control label. If this fuel i ...

Noise Control System
The following information relates to compliance with federal noise emission standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 4 536 kg (10,000 lbs). The noise control syste ...

Daytime Running Lamps (DRL)
Daytime Running Lamps (DRL) system makes the low-beam headlamps come on at a reduced brightness in daylight when the following conditions are met: ○ The ignition is on. ○ The exterior ...