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Cummins ISX12 engine

The Cummins ISX12 is a 6-cylinder engine with ratings up to 425 horsepower and 1,650 lb.-ft. of torque. It features a VGT turbocharger with electric actuation, XPI fuel injection system with multiple injection events per cycle and a single high-capacity electronic control module.


 

Featured reviews:

Government/utility fleet in Northeast with 20 trucks

4.4 Rating
Reviewer Comments It’s the most dependable engine in my fleet today.

It’s the most dependable engine in my fleet today. We still run Cats and Detroits, but the Cummins provides better uptime all the way around.

We have two ISX engines and I really like them. They haven’t given us any trouble to speak of. And when we do have to work on them, the repair bills are cheaper than the other engines we have. I ran some older Cummins engines years back when the joke was they’d “Come Apart.” But they’ve really upped the quality on their engines today. The version of the engines out today is much better.

See the breakdown
  • Suitability for your application/business 5
  • Overall reliability/durability 5
  • Overall engine design 5
  • Serviceability 5
  • OEM support 4
  • Dealer support 4
  • Fuel economy 4
  • Horsepower rating 4
  • Torque rating 4
  • Acquisition cost 4
  • Resale value 4

Government/utility fleet in Southwest with 10 trucks

3.4 Rating
Reviewer Comments They’re very trouble-free engines.

It’s been a good engine for us. We’re a municipality and have two of them. They’re very trouble-free engines. Very few oil leaks. They have plenty of power for our applications. We’ve only had one problem – an oil leak that was fixed quickly and covered by the warranty.

We don’t tear into engines in our shop – we just do basic maintenance work. Dealer support has generally been good. We did have one instance where we couldn’t get anyone to work on the engine because all the dealers were backed up. It wasn’t a big deal – it took a little longer to get the work done. But they eventually worked us in and got it taken care of.

See the breakdown
  • Suitability for your application/business 4
  • Overall reliability/durability 3
  • Overall engine design 4
  • Serviceability 4
  • OEM support 4
  • Dealer support 4
  • Fuel economy 3
  • Horsepower rating 3
  • Torque rating 4
  • Acquisition cost 2
  • Resale value 2

Refrigerated fleet in Midwest/South with 50 trucks

3 Rating
Reviewer Comments For the most part, the drivers like them. And my mechanic does, too.

We’ve got several ISX engines and they do OK for us. But recently fuel pump issues with our 2010 and 2011 engines came to light. And that’s been a big problem. We’re waiting on repair kits to come and it’s been over a month now. So we’re not real sure what’s going on.

For the most part, the drivers like them. And my mechanic does, too. But he thinks they’re all easy to work on!

See the breakdown
  • Suitability for your application/business 3
  • Overall reliability/durability 3
  • Overall engine design 3
  • Serviceability 3
  • OEM support 3
  • Dealer support 4
  • Fuel economy 2
  • Horsepower rating 3
  • Torque rating 3
  • Acquisition cost 3
  • Resale value 3

*Averaged from 24 qualified fleet reviews

3.7 Average*
  • Suitability for your application/business 4.1
  • Overall reliability/durability 3.8
  • Overall engine design 3.8
  • Serviceability 3.8
  • OEM support 3.7
  • Dealer support 3.8
  • Fuel economy 3.4
  • Horsepower rating 3.8
  • Torque rating 3.7
  • Acquisition cost 3.4
  • Resale value 3.6