ISX15 SmartAdvantage™ Powertrain - HD Truck

Power 400 - 450 hp
298 - 336 kW
Torque 1450 - 1750 lb-ft
1966 - 2373 N•m
Certification EPA 2013


Heavy-Duty Truck

Available Regions

US and Canada,  Russia,  Africa & Middle East,  Mexico,  Philippines,  Singapore,  Brazil,  Bolivia,  Uruguay,  Paraguay,  Argentina,  Colombia,  Central America,  Europe,  Japan,  Korea


SmartAdvantage™ Powertrain.
The Smart Way To Get A 3-6% Fuel Economy Advantage.

The new SmartAdvantage™ Powertrain takes the power of Cummins ISX15 with SmartTorque2 (ST2) and combines it with the smooth shifting of the Eaton Fuller Advantage 10-Speed Automated Transmission for improved fuel economy. The engine and transmission share critical data, determining the torque required to deliver the power level drivers need. Error-free, guessproof shifting makes every driver in your fleet as efficient as your best driver.

Cummins ISX15 with SmartTorque2.
Cummins ISX15 with SmartTorque2 (ST2) is available exclusively with the SmartAdvantage™ Powertrain. Higher torque is delivered earlier in the rpm range so you can cruise at 1150 – 1240 rpm and still get the torque and power needed to match real-time load demand. Fuel economy is improved through the combination of downspeeding, optimized communications between the engine and transmission, and the effective use of direct drive. These advanced technologies make it easier for drivers to operate within a larger “sweet spot” for better fuel economy.

Four ratings are currently available: 400 hp 1450/1650 lb-ft, 400 hp 1550/1750 lb-ft, 420 hp 1550/1750 lb-ft, and 450 hp 1550/1750 lb-ft.  All ratings include proprietary SmartTorque2 as well as Vehicle Acceleration Management.

SmartTorque2 automatically senses vehicle weight, grade, and operating gear, then selects the optimum torque for the best fuel economy and performance in every gear. Whether you are driving up a hill, merging onto the highway or passing slower traffic, the SmartAdvantage Powertrain provides the power you need, when you need it.

Vehicle Acceleration Management is a unique electronic feature that is automatically enabled on Cummins ISX15 ST2 engines in the SmartAdvantage Powertrain™. It assists with the acceleration rate from the launch of the vehicle, maintaining more consistent acceleration due to a more efficient transition through the gears. VAM results in smoother acceleration and reduced driveline wear, while increasing fuel economy.

Eaton Fuller Advantage 10-Speed Automated Transmission.
New features of the Eaton Fuller Advantage 10-Speed Automated Transmission include the strategic use of lightweight components and Precision Lubrication. Small-step technology enables downspeeding in overdrive and efficiency in direct drive. Optimized shifting is based on grade, vehicle weight, engine torque and throttle position.

Fuel economy is further enhanced through precision lubrication. Precision lubrication technology reduces churning losses, and eliminates the need for a cooler in most applications, for reduced weight and increased reliability.

For additional details about Eaton’s Fuller Advantage 10-Speed Automated Transmission, visit

Advertised Horsepower 400 hp
450 hp
298 kW
336 kW
Peak Torque 1450/1650 lb-ft
1550/1750 lb-ft
1966/2237 Nm
2102/2373 Nm
Governed Speed 1800 rpm  
Clutch Engagement Torque 1000 lb-ft 1356 Nm
Number of Cylinders  6  
Engine Weight (Dry)  2964 lbs  1344 kg 
The Power of Choice: Direct Drive or Overdrive
  • Only integrated powertrain to offer both
  • An optimal solution for every linehaul application

Top Gear


Power hp (kW)

Peak Torque
lb-ft (N•m) @ rpm


Axle Ratios

Small-Step Overdrive

Cummins ISX15 400 SA

400 (298)

1450/1650 (1968/2240) @ 1000



Cummins ISX15 400 SA

400 (298)

1550/1750 (2103/2375) @ 1000


Cummins ISX15 420 SA

420 (313)

1550/1750 (2103/2375) @ 1000

Cummins ISX15 450 SA

450 (336)

1550/1750 (2103/2375) @ 1000

Direct Drive

Cummins ISX15 400 SA

400 (298)

1550/1750 (2013/2375) @ 1000



Cummins ISX15 450 SA

450 (336)

1550/1750 (2013/2375) @ 1000

VGT™ Turbocharger from Cummins Turbo Technologies – The patented design is widely recognized as the industry leader for performance. Electric actuation improves precision and responsiveness. The VGT Turbocharger also increases fuel economy and braking horsepower.

XPI Fuel System From Cummins Fuel Systems – Delivers superior performance regardless of engine rpm. Multiple injection events per cycle improve fuel efficiency and enable smoother, quieter operation.

Cummins Aftertreatment System from Cummins Emission Solutions – 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 DEF is widely available at authorized Cummins and Fleetguard locations, as well as in bulk delivery.

Single High-Capacity Electronic Control Module (ECM) – A single ECM manages the engine and aftertreatment system for optimum performance and fuel efficiency.

Duty Cycles*




Oil & Filter

40,000 mi
64,000 km

30,000 mi
48,000 km

20,000 mi
32,000 km

Fuel Filter

40,000 mi
64,000 km

30,000 mi
48,000 km

30,000 mi
48,000 km

Coolant Filter**

50,000 mi
80,000 km


Valve Adjustment

500,000 mi
800,000 km


Coalescing Filter

125,000 mi
200,000 km


DEF Filter

300,000 mi
480,000 km


Diesel Particulate Filter

200,000 mi
320,000 km


*Light Duty > 6.5 mpg; Normal Duty = 6.5-5.5 mpg, Severe Duty < 5.5 mpg

**With appropriate filter

For complete maintenance information, please consult your Owner’s Manual or Operations and Maintenance Manual.

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