Detroit DD15 Engine

Six cylinders of industry-leading power

The DD15® builds upon the Detroit heavy-duty engine legacy to bring efficiency and performance to the next level. Offering the best of the best in diesel engine technology and engineering, the DD15 provides unmatched reliability for your trucks.

In addition to meeting GHG 2021 standards, the engine touts impressive power ratings, an innovative aftertreatment system and other key features to increase efficiency, durability and performance. Designed with enhanced downspeeding for better fuel economy and a swirl piston design for maximum combustion, the DD15 is up to three percent more fuel efficient than our previous model.

Brochures and Videos Maintenance Intervals and Warranties

1550-1850 lb-ft

Torque Range

425-505 HP




The DD15 engine has been significantly redesigned with innovative new features, building on the legacy of the most popular Class 8 diesel engine in North America.

More Specs


The best 6-cylinder diesel engine available in the heavy-duty commercial vehicle market just got even better. The DD15 builds upon proven Detroit® technology to offer industry-leading efficiency, performance and durability. Key design features include:

  • Better combustion  for better fuel economy
    • Ultra-high compression ratios paired with a new swirl piston design create better combustion—and up to 3% better fuel economy. Now more than ever, the DD15 has continued to prove itself as the industry leader, and one of the most efficient 6-cylinder diesel engines for sale in the market.
  • Versatility to be used in a wide range of applications
    • New power ratings and greater application coverage make this diesel engine powerful and durable - no matter what job it needs to do.
  • Enough power to get payloads moving quickly
    • A Ball Bearing Simple Geometry Turbo allows peak power and torque to be reached faster, which gets payloads moving without compromising efficiency.
  • Shorten regen cycles with new aftertreatment system
    • The innovative Thermocoasting features prevents aftertreatment system cool down during coasting and shortens regen cycles. This feature is one more way Detroit has continued to develop cutting-edge innovation on diesel particulate filters and aftertreatment systems, with the goal of decreasing potential ATS problems and increasing uptime.
  • Greater reliability than ever before
    • The engine offers less complexity and more durability in many of its key components to achieve an even higher standard. The DD15 is already one of the most reliable diesel engines ever made, this generation builds upon that legacy with expertly engineered improvements in engine technology.
  • Longer maintenance intervals
    • A new aftertreatment system is able to do more with less space, increasing ATS maintenance intervals.
  • Detroit’s trusted service and technology
    • Detroit’s #1-rated service network, along with the Detroit Connect Virtual Technician® remote diagnostic system, helps maximize uptime.

Model Options

Designed for a range of on-highway and vocational applications.

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Detroit Connect Virtual Technician remote diagnostic system

If maintenance issues come up while on the road, you can count on Detroit Connect Virtual Technician®. With Virtual Technician, you are notified within minutes when your vehicles experience a fault event, the severity of the fault and when, where and how to best fix the issue causing the fault so you can make informed service decisions.

Keep running

With the longest service intervals in its class and an easily serviceable design, the Detroit DD15 lowers your cost of ownership by decreasing your time in the shop. With oil and fuel filters positioned above the frame rails, you'll be back in the driver's seat fast.


Sharing common service operations and parts with the DD13 and DD16 ensures that trained technicians are ready to serve you and your DD15 at any of our 800+ authorized Detroit locations across the highways and back roads of North America.

Brochures and Spec Sheets

Detroit Engines Spanish Driver Card Detroit Engines French Driver Card Cascadia Detroit Engines Driver Card - French Cascadia Detroit Engines Driver Card - Spanish Cascadia Detroit Engines Driver Card DD15 | Sell Sheet | Detroit


Detroit Optimized Idle Training Video Detroit DDEC Training Video Detroit Engine Assembly Video Detroit Engines Regeneration Training Video Detroit DDEC Training Video Detroit Engines Family Product Video PasSmart Training Video Aftertreatment System Auto Elevate Training Video Pre-Trip HD Engine Inspection Introduction Training Video Pre-Trip HD Engine Inspection of Coolant Training Video Ralenti optimizado - Motor encendido - Video de entrenamiento Ralenti optimizado Detroit - Video de entrenamiento Pre-Trip HD Engine Inspection of Engine Oil & Oil Filter Training Video Pre-Trip HD Engine Inspection of Fuel Water Separator Training Video Pre-Trip HD Engine Inspection of Hoses Training Video Optimized Idle - Engine Not Running Training Video Optimized Idle - Engine Running Training Video Optimized Idle - System Safety Loops Training Video Parked Regen GHG17 - Overview Training Video Parked Regen GHG17 - Steps to Complete Regen Training Video Parked Regen GHG17 Dash Cluster - Overview Training Video Video de entrenamiento del sistema de autoelevado de ralenti - Posttratamiento Regeneracion Estacionaria GHG17  - Pasos para completar la Regeneracion - Video Regeneracion Estacionaria GHG17 - Cluster Dash - información general d - vídeo Ralenti optimizado - Motor apagado - vídeo de entrenamiento DD15 | On-Highway Features | Detroit Ralenti optimizado - Video de entrenamiento de bucles de seguridad del sistema Diesel Particulate Filter (DPF) Cleaning Procedure Video BlueTec Emissions Technology Video


Detroit Engines Trinity Image DD15 | Image | Detroit DD15 | Image_v2 | Detroit DD15 | Right Side Image | Detroit DD15 | Left Side Image | Detroit DD15 | Left Side v2 | Detroit


Maintenance Intervals


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Detroit Connect Portal

The Detroit™ Connect portal is easy-to-use, one-stop-shop for all vehicle performance data gathered, transmitted and analyzed by Detroit Connect.  The portal gives you access to insights delivered by  Detroit Connect Virtual Technician℠. The Detroit Connect portal will also give you access to new features, such as Remote Updates, and Analytics, available late 2017.

Detroit connect portal login


All DDCSN content has been migrated to our DTNAConnect web portal. All information previously on the DDCSN is now on DTNAConnect. We have created a quick reference guide to help you locate the migrated content on DTNAConnect. Existing DDCSN login credentials will also work with DTNAConnect. Please work with your security administrators for login or content issues. If you do encounter any technical issues, please contact the Software Support Center at 855-639-8680 or


DTNA Connect Portal

DTNA Connect is the starting point for working with all brands and franchises that fall under the Daimler Truck North America umbrella: Detroit, Thomas Built Buses, SelecTrucks, Sterling, Freightliner, and Western Star. Here, you can access the full spectrum of online applications, resources and tools you need. Whether you use DTNA online resources to complete repairs, purchase parts, submit warranty claims, spec new vehicles or track the status of your truck orders, DTNAConnect streamlines the tasks and activities that are part of your daily work routine.

DTNA Connect Portal Login