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This engine will likely need detailed testing requiring the service tooling CAT ET and fuel system tools.
Do you have these items available?
The monitor does not have the ability to test the engine functions so, the only way to know is with ET tooling.
When I had this issue with older machines, it usually requires new injectors and maybe the injection pump.
Since this a a high pressure common rail fuel system, it could be anything in the engine electronics or fuel systems.
Thanks for the reply. I am sorry I could not help more. CAT has limited options for this model and ET is the only way to know what is happening.
Hopefully, this will be something simple.