Responding Faster. Every Call. ISX12. Superior response is now available in the industry's most compact 10- to 13-liter engine. Cummins ISX12 builds on the legacy of the ISM and proven technology of the ISX15 to deliver better fuel economy, performance, reliability and durability. It has more horsepower and more torque, plus stronger acceleration – all in a compact design. It achieves near-zero emissions and reduces noise output. The ISX12 is built to respond faster to every call.

The ISX12 G natural gas engine delivers the strong pulling power and heavy-duty durability required for regional-haul truck/tractor, vocational and refuse applications. It features Stoichiometric cooled Exhaust Gas Recirculation (SEGR) combustion technology, which allows the use of a maintenance-free Three-Way Catalyst (TWC). Ratings range from 320 hp to 400 hp (239-298 kW) with 1450 lb-ft (1966 N•m) of peak torque. The inherent efficiency of this engine and an abundant supply of natural gas reduce operating costs, making the ISX12 G the natural choice for your fleet.