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Powertrain details
The GMC Sierra All Terrain HD concept is propelled by the new, production 6.6L Duramax turbo-diesel V-8 and Allison 1000 six-speed automatic transmission powertrain combination offered in the 2011 ...

Tire Pressure Monitor Operation
This vehicle may have a Tire Pressure Monitor System (TPMS). The TPMS is designed to warn the driver when a low tire pressure condition exists. TPMS sensors are mounted onto each tire and wheel as ...

Lumbar Adjustment
Manual Lumbar If equipped, increase or decrease manual lumbar support by turning the knob forward or rearward. See Lumbar Adjustment on page 3‑4 for more information. Power Lumbar To ...