C13 crankcase pressure....

hi tp all!

This summer I cheked '07 Columbia with C13. Everething was OK, but last week driver called me he lost power and CEL is on. He read fault code: crankase overpressure.

When truck has been back to garage, I've inspected crankcase ventilation and found it good and I see that there is oil around dipstick.

Driver says he has to add oil! So it looks like cylinders, pistons, rings went bad!!! Engine burns oil!!!

I cant understand how is it possible to wear engine in 10K.

I inspected air filter and I cant see any problem.

No any engine protection event exept of crankcase pressure stored in ECM.

The only thing I know that truck ran to Omsk, Syberia, amd roads there are usually dusty. And may be driver had to change filters. And it was installed wrong ones....