If you drive or run a Freightliner Cascadia, there is a good chance it has a DD15 under the hood. It is one of the most common heavy truck engines on the road today, and when one fails, the truck stops earning. We have a Detroit DD15 engine for sale, tested, matched to your engine and shipped to buyers anywhere in the world.
Ready to buy? See the price, photos and stock for our fairly used Detroit DD15 engine for sale in the shop, or send your engine serial number through our contact page and we will reply with a written quote.
We sell engines and that is our whole business. A Detroit DD15 engine for sale is one of the most requested modern diesels we handle, mostly by fleets and owner operators who need a newer truck back to work without paying for a brand new engine.
This guide covers the DD15 specs, the trucks it fits, the different generations, the emissions system, the common problems, how we test and how buying from us works.
Why a Detroit DD15 Engine for Sale Makes Sense
Detroit launched the DD15 around 2007 as the replacement for the famous Series 60. It was a clean sheet design, built around a new 14.8 litre block, an amplified common rail fuel system and, on many versions, a turbo compound unit that turns exhaust energy back into power at the crankshaft. It was built to meet tougher emissions rules while using less fuel.
It worked. Fleets liked the fuel economy and drivers liked the torque. The DD15 became the standard engine in many Freightliner and Western Star trucks, and today there are huge numbers of them working worldwide.
A new DD15 is expensive and can be hard to get quickly. That is why a tested Detroit DD15 engine for sale makes so much sense. You get a modern, efficient engine for a fraction of the cost, and your truck is back on the road in days rather than weeks.
Detroit DD15 Engine Specifications
These figures cover the common truck versions. Ratings vary with the year and the software, so we confirm details from the data plate before quoting any Detroit DD15 engine for sale.
| Engine type | Inline 6 cylinder, four stroke turbo diesel |
| Displacement | 14.8 litres (903 cubic inches) |
| Bore x stroke | 139 mm x 163 mm |
| Valve train | Dual overhead camshafts, 4 valves per cylinder |
| Fuel system | Amplified common rail system (ACRS) |
| Turbo | Single or asymmetric turbo, with turbo compounding on some generations |
| Horsepower | About 455 to 505 hp |
| Peak torque | About 1,550 to 1,750 lb-ft on common ratings |
| Emissions equipment | Cooled EGR, DPF, and SCR with DEF from EPA10 |
| Common assembly numbers | 472906S (EPA10 and GHG14), 472910S (GHG17) |
| Dry weight | Roughly 2,800 to 3,000 lb |
| Production | 2007 to the present |
The assembly number on the data plate is the quickest way to tell which generation you have. Send it to us when you ask about a Detroit DD15 engine for sale.
Which Trucks Use the DD15?
The DD15 is mainly found in trucks from the Daimler Truck group:
- Freightliner Cascadia, Columbia, Century Class and Coronado
- Freightliner 114SD and 122SD vocational trucks
- Western Star 4900, 5700XE, 49X and 57X
- Some specialty and vocational chassis built on Daimler platforms
The Freightliner Cascadia is by far the most common home for this engine, while Western Star uses it in heavy haul and vocational work. Because wiring, aftertreatment and accessories changed between generations, we always ask about your truck before quoting a Detroit DD15 engine for sale.
DD15 Generations Explained
EPA07. The first DD15 engines used cooled EGR and a diesel particulate filter, with no DEF. These are found in early Cascadia and Century trucks around 2008 to 2010.
EPA10. From 2010 Detroit added selective catalytic reduction with DEF, branded BlueTec. This let the engine run more efficiently and is the start of the DEF era.
GHG14. Around 2013 to 2014 Detroit updated the engine for greenhouse gas rules, with changes to the turbo, the calibration and the aftertreatment, including the one box system on many trucks.
GHG17. From around 2016 to 2017 the engine was updated again for better fuel economy, with assembly numbers starting 472910S. Many of these are still working in fleets today.
Gen 5. The latest DD15 arrived around 2021, and some versions brought back turbo compounding for more torque and efficiency.
Generations are not always interchangeable. The ECUs, harnesses and aftertreatment need to match. That is why matching the generation is the first thing we do with every Detroit DD15 engine for sale.
The Emissions System
The DD15 is a modern emissions engine. Depending on the year it has cooled exhaust gas recirculation, a diesel oxidation catalyst, a diesel particulate filter, a hydrocarbon doser and selective catalytic reduction with DEF. All of these are monitored by sensors and controlled by the engine and aftertreatment computers.
When the system works it runs clean and efficient. When it does not, the truck may derate or stop. Many engine complaints on a DD15 are actually aftertreatment problems. Before you replace the engine, make sure the fault is really inside it. If you do need a Detroit DD15 engine for sale, you will usually keep your existing aftertreatment, as long as it matches the engine generation.
Known DD15 Weak Spots
The DD15 is a good engine, but even a healthy Detroit DD15 engine for sale has a few areas worth checking:
- EGR cooler and valve. Coolers can leak and valves can stick, causing coolant loss, power loss and fault codes.
- Doser and DPF. The hydrocarbon doser can clog and the DPF can load up, especially with lots of idling.
- NOx sensors and DEF parts. Common failure items that cause derates.
- Turbo compound unit. On engines that have it, seals can leak oil over time.
- Water pump and oil leaks. Normal wear items on a high mileage engine.
- High crankcase pressure. Can point to ring or liner wear, or a breather problem.
- Injector trouble from bad fuel. Common rail injectors do not like water or dirt in the fuel.
How We Test Every Detroit DD15 Engine for Sale
Before any Detroit DD15 engine for sale leaves our yard, we:
- Record the engine serial number, assembly number and rating from the plate.
- Read the ECM where possible for mileage, hours and stored fault codes.
- Run a compression or cylinder cut-out test where the engine runs.
- Check the oil for coolant, fuel or metal.
- Run the engine where possible and check oil pressure, crankcase pressure and smoke.
- Check the turbo and, where fitted, the turbo compound unit for play and leaks.
- Photograph the engine from every side, including the data plate.
You get the results and photos with your quote. More detail is in our guide to tested used engines.
What Comes With the Engine
Most of our DD15 stock is sold as a complete engine, which usually includes the block, head, injectors, turbo, EGR parts, manifolds, oil pan and front cover. Some engines come with the engine computer. The aftertreatment system is normally separate. Accessories like the air compressor, starter and alternator vary.
We list exactly what is included on every quote. If you need a long block, ask for that price.
Used, Rebuilt or Remanufactured?
Used engines come out of trucks and are sold after testing. They cost the least.
Rebuilt engines have new wear parts fitted, such as liners, pistons, rings, bearings and gaskets.
Remanufactured engines are restored to factory specifications throughout and cost the most.
Many fleets choose a tested used Detroit DD15 engine for sale because the DD15 is still young in engine terms and low mileage units are available. We will help you weigh up the options.
7 Checks Before You Buy Any Detroit DD15 Engine for Sale
1. Match the generation
Before you pay for a Detroit DD15 engine for sale, compare the assembly number with your old engine. EPA07, EPA10, GHG14 and GHG17 engines are not all interchangeable.
2. Check the computer
Know whether the engine computer is included and whether it needs programming for your truck.
3. Ask for fault codes and mileage
A seller who tested their Detroit DD15 engine for sale can share ECM data along with compression or cut-out results.
4. Check for coolant in the oil
Coolant in the oil can point to EGR cooler or oil cooler problems.
5. Ask for real photos
Get pictures of the actual engine and its data plate, not stock images.
6. Know what is included
Two listings for a Detroit DD15 engine for sale can look the same and still be very different once you count the turbo, EGR parts, computer and accessories.
7. Read the warranty
Know how long it lasts and what it covers. See our used engine warranty guide.
What Affects the Price
The price of a Detroit DD15 engine for sale depends on the generation, mileage, condition and what comes with it. Newer GHG17 and Gen 5 engines with low miles cost the most. Older EPA07 engines usually cost less, but they need to match the truck. Complete engines cost more than long blocks.
Freight is part of the total too, since a crated DD15 is heavy. We include freight options with every quote. Read our guide to replacement engine cost for more.
Signs Your Truck Needs a Replacement Engine
Some DD15 problems are simple fixes. Others point to serious internal damage. These are the signs that usually lead buyers to look for a Detroit DD15 engine for sale:
- Knocking from the bottom end that grows with load
- Metal on the oil filter or drain plug
- Coolant and oil mixing that is not caused by a cooler
- Very high crankcase pressure and heavy blow-by
- Low oil pressure when the engine is warm
- A dropped valve or a hole in a piston
Send us your symptoms and fault codes and we will give you an honest opinion before you spend money.
How Long Does a DD15 Last?
A DD15 that is serviced on time can run a million miles or more in highway work. Engines that fail early usually had coolant problems, bad fuel, long idle times or overheating. Clean fuel and clean DEF matter a lot on this engine.
When you compare a Detroit DD15 engine for sale, the service history and ECM data tell you more than the miles alone.
Habits that help a DD15 last
- Change oil and filters on schedule with the right low ash oil.
- Use clean fuel and drain the water separator often.
- Keep DEF fresh and clean.
- Avoid long idling, which loads up the DPF.
- Fix coolant leaks and overheating at once.
Rebuild Your Old DD15 or Replace It?
An in-frame rebuild keeps your own engine, but the truck is off the road while the work is done, and hidden damage can push the bill up. A tested Detroit DD15 engine for sale is usually faster to install, and you know its condition before you pay. Your old engine may also have core value. If the block or crank is damaged, or the truck earns every day, replacement usually wins.
Programming and Parameters
The DD15 is controlled by an engine computer, and on most generations there are separate modules for the engine, the aftertreatment and the truck. These talk to each other over the vehicle network. When a replacement engine goes into a truck, the software has to match what the truck expects.
In practice that means a few things. The engine computer needs the right calibration for the engine, with the correct injector codes loaded. The truck settings, such as road speed limits, cruise control, idle shutdown and power ratings, need to be set for your truck. And the aftertreatment module has to recognise the engine and its sensors.
Most heavy truck shops with Detroit diagnostic software can handle this, and in many countries there are independent workshops that do it too. When you buy a Detroit DD15 engine for sale from us, we tell you whether the computer is included and share the engine data so your mechanic has what they need. It saves a lot of time on the day of the install.
Information worth having before the install
- The engine serial number and assembly number
- The injector trim codes
- Your truck VIN and model year
- Your old engine rating and any custom settings you want kept
Fuel Economy and Everyday Driving
Fuel economy is one of the main reasons fleets picked the DD15. On long highway runs with an automated manual gearbox and good aerodynamics, many trucks report figures from the mid sixes to above eight miles per gallon, depending on load, speed and terrain. Older EPA07 trucks usually sit lower, and the newer GHG17 and Gen 5 engines sit higher.
How you drive matters as much as which engine you have. The DD15 makes its best torque low in the rev range, so short shifting and running at lower engine speeds saves fuel. Long idling hurts economy and loads up the particulate filter, so idle shutdown and an auxiliary power unit are worth having on sleeper trucks.
A healthy Detroit DD15 engine for sale should deliver economy close to what your old engine did when it was fresh. If yours was using noticeably more fuel before it failed, that was likely part of the problem, often a tired turbo, leaking injectors or a clogged aftertreatment system.
Matching the Aftertreatment
Most buyers keep the aftertreatment that is already on the truck. That works well when the replacement engine is the same generation. If you move between generations, for example from an EPA10 engine to a GHG17 engine, the aftertreatment, sensors and software usually need to change too. That can add a lot of cost, so it is better to match the engine to the truck from the start.
If your old engine failed in a way that sent oil, coolant or metal into the exhaust, check the aftertreatment carefully before you fit the new engine. A diesel particulate filter soaked in oil will clog quickly and can even catch fire during regeneration. Cleaning or replacing it is much cheaper than damaging a fresh engine.
We are always happy to help you work out which Detroit DD15 engine for sale matches your truck and its aftertreatment. Send us your VIN and the details from the old engine plate.
Buying for a Fleet
If you run several DD15 trucks, it can make sense to keep a spare engine ready. When an engine fails, a swap takes far less time than waiting for a repair, and the truck is back earning quickly. We work with fleet buyers who need more than one Detroit DD15 engine for sale, and we can help match engines to different generations across your trucks. Ask us about multiple engine orders when you request your quote.
Worldwide Shipping
We ship engines to buyers across Africa, Europe, the Middle East, Asia, Latin America, the Caribbean and North America. Each engine is drained, sealed, strapped or crated and shipped with tracking. We prepare the export paperwork and work with your clearing agent.
Read our shipping policy for timing details.
Installation Tips
When your Detroit DD15 engine for sale arrives, these steps help:
- Flush the cooling system and check the radiator.
- Clean the charge air cooler if the old engine failed with oil or metal in the intake.
- Check the aftertreatment. A DPF full of oil from a failed engine should be cleaned or replaced.
- Fit new filters, add fresh oil and prime the fuel system.
- Program the engine computer for your truck and clear old codes.
New to buying engines online? Read how to buy a used engine online.
DD15 vs Series 60 and Other Engines
The DD15 replaced the Detroit Diesel Series 60. The Series 60 is simpler, while the DD15 is more efficient and meets newer emissions rules. In the same class you will also find the Cummins ISX15 and the Volvo D13. For more on the company, see the Detroit Diesel page.
Which one is right comes down to the truck you already own. If your chassis was built around the DD15, the easiest and cheapest path is almost always another DD15 of the same generation. Changing engine brands means new mounts, wiring, cooling parts and software, and the bill grows fast. Stick with what the truck was designed for and the job stays simple. If you are unsure, send us the VIN and we will tell you exactly what fits.
Other Heavy Diesel Engines We Sell
We also supply the Caterpillar 3406E, the Cummins N14 and the Caterpillar C13. See all our used diesel truck engines and our guide to low mileage used engines.
Why Buy From NJ Global Auto Parts
We test our engines, describe them honestly and ship worldwide. We confirm the fit before you pay. Every Detroit DD15 engine for sale from us comes with real photos, a written quote, tracking and a written warranty. Our refund and returns policy is open to read before you order.
Frequently Asked Questions
What year did the DD15 come out?
Around 2007, first in Freightliner trucks for the 2008 model year.
How much horsepower does the DD15 make?
Most ratings fall between 455 and 505 hp.
Can I fit a GHG17 engine in an EPA10 truck?
Not as a simple swap. Wiring, computers and aftertreatment differ. Ask us before you buy.
Does your Detroit DD15 engine for sale include the aftertreatment?
Usually not. Most buyers keep their existing aftertreatment. The quote always says what is included.
Do you ship worldwide?
Yes, with export paperwork handled.
How do I pay?
Bank transfer only. Details come with your written quote.
How do I get a quote?
Send your engine serial number, assembly number or VIN through our contact page or call +1 (209) 733-0882.
Get Your Truck Back on the Road
Every day a truck sits, it costs money. If you need a Detroit DD15 engine for sale that has been tested, matched to your truck and shipped with tracking, get in touch today. We will confirm the fit, send photos and give you a straight price, wherever you are.