The Caterpillar C15 ACERT is an advanced version of the C15 diesel engine, introduced in 2004 to meet stricter EPA emission standards. The term "ACERT" stands for Advanced Combustion Emission Reduction Technology, focusing on optimizing air and fuel systems to reduce emissions.

The C15 ACERT is an inline six-cylinder engine with a displacement of 15.2 liters. It offers power ratings ranging from 440 to 595 horsepower (328 to 444 kW) at speeds between 1,800 and 2,100 rpm. These specifications make it suitable for various heavy-duty applications, including agriculture, construction, mining, and industrial sectors.