ISX15 for Motorhome (2013)


ISX15 for Motorhome (2013)Beyond Every Expectation.

For customers wanting the ultimate in performance from their premium motorhome, the engine of choice is Cummins ISX15 – the most popular heavy-duty engine sold in North America.  It is rated at up to 600 horsepower and 1950 of peak torque, making it ideal for even the largest,most heavily equipped units.

Its XPI fuel system delivers a precise quantity of fuel at ultra-high pressures. This allows multiple injection events per cycle. This, together with enhanced turbocharging and reduced power demand from external engine components delivers the ultimate combination of industry-leading fuel economy along with quiet, smooth acceleration. Best-in-class braking (up to 600 bhp) is accomplished through the Cummins Intebrake, which delivers greater vehicle control while reducing service brake wear.

The ISX15 maintenance schedule has been significantly improved over the last decade, with oil and oil filter changes, valve adjustments and fuel filter changes now recommended at twice the mileage of our 2010 engine. This, together with an increase in fuel economy of up to 2 percent, lowers total operating costs over the life of your motorhome.

Plus, when it’s time to trade up to a newer model, Cummins-powered motorhomes deliver traditionally higher resale value.

A Cummins-designed and manufactured aftertreatment system is fully integrated and now includes on-board diagnostics that continuously monitor engine and aftertreatment performance to ensure near-zero emissions.

All of this is backed by unmatched support, from the largest service network in North America. This includes exclusive programs like Coach Care™ and 24/7/365 assistance from your Cummins Care representatives at 1-800-DIESELS (1-800-343-7357).

For Cummins-branded merchandise, electronic tools, literature and more, visit the Powerstore. PowerSpec

Cummins PowerSpec is an electronic tool that makes it possible to tailor the operation of Cummins engines in every on-highway application.

Available for: On-Highway, Motorhome

See ISX PowerSpec Engine Features


Advertised Horsepower

550-600 hp

410-448 kW

Peak Torque

1,850-1,950 lb-ft

2,508-2,644 Nm

Governed Speed

1,800 rpm

Clutch Engagement Torque

800 lb-ft

1,356 Nm

Number of Cylinders


Biodiesel Compatibility

Up to B20


System Weight (Dry)

3,204 lb

1,453 kg

Engine Finder Specifications

Certification Level EPA 2013
Power 550 - 600 hp / 410 - 447 kW
Torque 1850 - 1950 lb-ft / 2508 - 2644 N•m


Engine Model 
Advertised Horsepower (kW) Peak Torque lb-ft (N•m) @ rpm Governed Speed
ISX15 600 600 (448)    1950 (2644) @ 1200   1800 rpm
ISX15 550 550 (410) 1850 (2508) @ 1200 1800 rpm


XPI Fuel System – Delivers superior performance at every speed. Multiple injection events per cycle improve fuel efficiency and enable smoother, quieter operation.

VGT™ Turbocharger From Cummins Turbo Technologies – The patented design is widely recognized as the industry leader for performance. Electric actuation provides quick throttle response and increased braking horsepower.

Cooled EGR – Next-generation system lowers combustion temperatures for reduced emissions and optimized fuel economy.

High-Capacity Electronic Control Module (ECM) – A single ECM manages the entire engine and aftertreatment system for optimum performance and fuel economy. This ECM is used across the board for Cummins on-highway engines, to simplify servicing

Intebrake – The standard internal engine braking system delivers best-in-class braking horsepower (up to 600 bhp) for greater vehicle control with reduced service brake wear.

Cummins Aftertreatment System From Cummins Emissions Solutions – The proprietary system consists of a Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) technology for near-zero emissions.

Fleetguard® Fuel Filters, Lube Filters And DEF From Cummins Filtration – Fleetguard filters protect against corrosion and contaminants that can cause performance issues. High-quality Diesel Exhaust Fluid (DEF) is widely available at authorized Cummins and Fleetguard locations.


Duty Cycles 
Oil and Filter  30,000 miles 
48,000 km
Fuel Filter*   30,000 miles
48,000 km
Coolant Filter*  50,000 miles
80,000 km
Overhead Adjustment 500,000 mi   
800,000 km
Coalescing Filter   125,000 mi
200,000 km
DEF Filter      300,000 mi
480,000 km
Particulate Filter Cleaning 200,000 mi
320,000 km

*With appropriate filter

Brochures Available

Title Bulletin Number Request View  
2013 ISX15 And ISX12 Engines For RV Applications Spec Sheet 4971465 Request View  Download
2013 RV Applications Brochure 4971462 Request View  Download
ReCon DPF Flyer 2878897 Request View  Download