Detroit DD15 GEN 5 Engine

The Best Just Got Even Better

The new DD15® Gen 5 engine builds upon Detroit’s industry-leading heavy-duty engine legacy and proven technologies to bring efficiency and performance to the next level. The DD15 Gen 5 engine offers the best of the best in cutting-edge diesel engine technology and engineering, resulting in the most reliable diesel engine for your semi truck.

The DD15 Gen 5 has been significantly redesigned to offer new ratings, an all-new aftertreatment system, and numerous innovations to further increase efficiency, durability and performance. We’ve engineered key improvements to the design of the DD15, including increased downspeeding, better combustion and new swirl piston design --  culminating in a fuel efficiency improvement of up to three percent. All while meeting GHG 2021 standards.

Brochures and Videos Maintenance Intervals and Warranties

1550-1850 lb-ft

Torque Range

425-505 HP




The DD15 Gen 5 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 Gen 5 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, and the Gen 5 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.

Western Star
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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 Gen 5 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 Gen 5 at any of our 800+ authorized Detroit locations across the highways and back roads of North America.

Brochures and Spec Sheets

DD15 Gen 5 Engine Vocational Spec Sheet DD15 Gen 5 Engine OH Spec Sheet


DD15 Gen 5 - Vocational Features DD15 Gen 5 - On-Highway Features


DD15 Gen 5 Image DD15 Gen 5 Image_v2 DD15 Gen 5 Right Side Image DD15 Gen 5 Left Side Image DD15 Gen 5 Left Side v2


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