Crankcase Pressure High on Cummins ISX 15 and X15 – How to Diagnose & Troubleshoot



Are you experience high crankcase pressure on your Cummins ISX15 or X15? Here are tips how to diagnose and troubleshoot.
#crankcase #semitruck #mechanic #emission

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30 thoughts on “Crankcase Pressure High on Cummins ISX 15 and X15 – How to Diagnose & Troubleshoot”

  1. Single costly issues like these in trucking and being an O/O is what piss me off the most and just makes me want to hang it up and say the hell with trucking…..smh it’s insane how mechanics want to charge ridiculous amounts of money to do these jobs also. Like bro do you think I’m just pulling money out my hat….smfh 💀🤦🏻‍♂️

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  2. Hello watched your videos. Have a question about my injector. I’ve been getting check engine lights because of fault code 1143 which is Injector solenoid 4 mechanical system not responding or out of adjustment. That injector has been replace twice but still gives me check engine light. Trucks runs just fine and not derating. Any ideas of what that might be thanks so much

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  3. I get high crankcase pressure when I pull hard then it wants to shut it down. I idle it along to where it's inactive plug in, delete the code and go again but I use some recycled oil for a year and a half against my better judgment then went back to my rotello. Still fighting the problem. Will be plugging in these things are eating injectors another subject for another day

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  4. At one time Cummins spec on blow-by, or crankcase pressure, was anything over 3.0 in H2o, was cause for concern. I wouldn't tear into an engine for that alone, I would want some excessive oil consumption to be present too.

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  5. I have worked at a KW dealership for 25 years I had to laugh about 7 years ago when we sent a truck to Cummins for a dyno run they sent it back and said it needed 6 cylinder kits because it didn't have enough blow by I can honestly say that was the first engine that I have ever rebuilt for not enough blow by. But as it turned out that was when they were having problems with carbon packing and they came out with the new anti polishing liners

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  6. HEY ryan on the kenworth cx15 semi 370 gear ratio we hauling gravel with dump trailer truck is t880 2021 this thing is super slow pulling the load an going up small hills can this truck be turned up.

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  7. Cummins are junk got sick of my fleet of them needing rebuilds every 300,000 miles. Switched to Scania and have 4 with 900,000 miles and havent done any engine rebuilds on any of them

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