L9 is at the top of its class

With over 35 years of production and 5 million L-series engines produced globally with millions of miles driven, the L9 has the proven track record and higher power output you need for Class C and D buses used for longer trips and demanding routes. With ratings from 260 to 360 horsepower (194-268 kw), the L9 provides a range of options to meet every power need.

Long-lasting, heavy-duty components

Cummins L9 incorporates heavy-duty components and design elements from the X15 and X12 platforms. This includes our proprietary XPI™ fuel system, bypass oil filtration and replaceable cylinder liners. The 2024 L9 Single Module aftertreatment system provides size and weight reductions from its 2013 predecessor, as well as improved DOC and SCR catalysts that allow for increased ash-capacity and improved regeneration frequency and reliability. The L9 also features the updated UL2 with Next Gen Nozzle dosing unit, an improved differential pressure sensor for better uptime. 

A support staff that's always on

No matter where your school buses travel, there’s an authorized Cummins service provider nearby at one of our 3,700 locations. In the unlikely event of a fault alert, buses equipped with telematics can use our Connected Diagnostics™ option to send engine data to Cummins and get an all-clear signal for continued operation or the need for immediate service. Cummins Care is on call 24/7/365 at 1-800-CUMMINS™ (1-800-826-6467) to respond to your needs. That’s what it takes to power a world that’s Always On. 

Features & Benefits

Cummins designs, develops and supports every component, from the air handling to the exhaust aftertreatment, to work as a totally integrated system – so we can optimize every function better than other engine manufacturers.

• VGT® Turbocharger from Cummins Turbo Technologies - The patented design is widely recognized as an industry performance leader. Electronic actuation improves precision and responsiveness. The VGT Turbo is a key element in providing exceptional fuel economy and braking horsepower

• Connected Diagnostics™ - Wirelessly connects your engine to Cummins through a telematics device for immediate diagnosis of a fault alert. Provides a clear recommendation for continued operation, or the need for service, within seconds.

• XPI Fuel System from Cummins Fuel Systems - Delivers superior performance even in lower engine rpm ranges. Enables multiple injection events per cycle, for improved fuel efficiency with quieter, smoother operation.

• Single Module Aftertreatment From Cummins Emission Solutions - Combines high-efficiency SCR, a more reliable dosing unit and a DPF into a single flow-through unit. It is up to 70 percent smaller, so it’s easier to install, and as much as 30 percent lighter than the aftertreatment units it replaces. Better heat management improves fuel efficiency and minimizes periodic maintenance.

• Fuel Filters And Lube Filters From Cummins Filtration - Fleetguard® filters protect against corrosion and contaminants with innovative technology, including NanoNet® media, which provides 10 times better protection than conventional fuel filters.

• Single High-Capacity Electronic Control Module (ECM) - A higher capacity offers faster processing of more information, fully integrated control over the engine and aftertreatment system for optimized performance and improved engine lamp strategy.