Cummins L9

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The Cummins L9 is an 8.9 litre, inline six cylinder diesel engine available for medium-duty trucks and urban transit buses. Introduced at the National Truck Equipment Association Work Truck Show in March 2016 and available beginning in 2017, the L9 is the successor to the Cummins ISL.[1]

New for Cummins' 2017 line of engines is a Single Module aftertreatment system which combines the Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) systems into a single canister. The more compact, lighter emissions control systems, according to Cummins, also boast greater thermal efficiency for improved engine operation.[2] Unique to the transit applications, the L9 will continue to use the Modular Aftertreatment System.[3]

The Cummins L9 features enhanced on-board diagnostics (OBD) that ensure emissions stay within the EPA limits as well as enhanced electronic controls. Cummins has also added a particulate matter sensor. The engine meets EPA 2016 and GHG 2017 regulations. It boats a 15 percent improvement in fuel economy over the 2007 ISL.[2]


  1. Redefining Classics: Cummins Introduces The Next Generation Of Iconic Midrange Engines. 01 March 2016. Press release. Cummins. Retrieved on 21 December 2016.
  2. 2.0 2.1 2017 Cummins L9 brochure. 2016. Cummins. Retrieved on 21 December 2016.
  3. Cummins Announces 2017 Engine Lineup for Transit. 16 May 2016. Press release. Retrieved on 21 December 2016.

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Current products
Diesel B4.5 / B6.7 - L9 - X12 / X15
CNG ISB6.7 G - ISL G - ISX12 G - L9N
Former products
Diesel ISB6.7 - ISL9 - ISX12 / ISX15 B5.9 - C8.3 - ISC - ISM - L10 - M11 - NH Series - VTB-903
CNG B5.9G - B Gas Plus - C8.3G - L10G - C Gas Plus - L Gas Plus
Propane B LPG Plus