Today and few days back my SD went high idle like regeneration but when i pressed brake pedal it stopped. And when I take my leg of the pedal it didn't went high idle like normally during regen, is it normal ??. I've got sct with latest tune

 

I am assuming that you are experiencing colder temperatures over there in Poland, if so this is normal operation. What you are experiencing is the trucks cold weather idle strategy. The cold weather idle strategy will idle the truck up to help bring the engine up to normal operating temperature faster.

 

Sounds like the warm up high idle. If the RPM's eventually went down it wasn't trying to regenerate.

 

Thanks! i thought so, by the way the black smoke rules