High crank case pressure

Have dirt daubers invaded your draft tube?

 

Have you gotten to the dealer with the code active...?

And a cat house is probably your best bet.

 

Can you elaborate on active and nothing shows up?

 

How many miles on it and what is it? Usually a new filter straightens them out.

And the the dealer is clueless . Gotta love it.

 

Maybe dpf needs a good cleansing, where it disappears, oops, my mistake.

 

The Engine Control Module (ECM) activates this code when the crankcase pressure has exceeded the limit for a programmed time period. The amber warning lamp is illuminated. The code is logged. Engine power is derated.

This code can be caused by an obstructed tube, an obstructed filter (if equipped), or an obstructed hose. Also, a plugged OCV system will cause the code.

Plugged OCV System a plugged OCV system will cause excessive crankcase pressure, check the OCV for plugging.
Faulty Check Valve can cause excessive crankcase pressure. A faulty check valve will not allow the crankcase to vent properly,replace the check valve.

A plugged disposal tube will not allow the crankcase to vent properly check the disposal tube for obstructions.

Faulty Sensor
Connect Caterpillar Electronic Technician (ET) to the service tool connector.

Turn the keyswitch to the ON position, But Do NOT start the engine.
Remove the oil filler cap. Monitor the crankcase pressure in Cat ET.

Or

Internal Engine Problem
Damaged pistons or rings can cause too much pressure in the crankcase. This condition will cause the engine to run rough. There will be more than the normal quantity of fumes (blowby) entering the OCV system. The OCV system can then more quickly become restricted, causing oil leakage at gaskets and seals that would not normally have leakage. Blowby can also be caused by worn valve guides or by a failed turbocharger seal.

To determine whether the piston rings leak, measure the crankcase blowby. Use the following service tools, along with Software License, NETG5044:
285-0900 Blowby Tool Gp (SMALL ENGINE)
348-5430 Multi-Tool Gp