2012 model received a model change, but his debut at the Chicago Motor Show in February 2012, GM is now, according to the announcement of the GMC "Sierra HD" of the car brother, was published the specs for diesel new . Turbo diesel "Dura-Max" type eight-cylinder 6.6 liters V receives a supply from new Isuzu, 397ps/3000rpm maximum output, maximum torque 105.7kgm/1600rpm won the top of its class. Dura-Max than the former, then power up 32ps, also 14.5kgm, maximum towing capacity is 9072kg, to realize the maximum loading capacity 2873kg.
Fuel, corresponding to B20 biodiesel. Bio-fuel and B20, which was a mixture of 20% biodiesel 80% diesel oil, the effect is to reduce the emissions CO2. NOx in the exhaust gas was reduced by 63 percent compared with 2012 model year. In addition, according to GM, EPA fuel economy the United States expected to fast (Environmental Protection Agency) is called to be around 7.99km / l.