EGR Issues

[Dieseldaddy59]

I've recently bought a 2010 KW T660 with a 2007 ISX 485 Cummins. I've not had a DPF motor before so this is new to me. I use to have a 2005. So it appears that when it is doing a passive regen going down the road. It seems to smoke more under power. It's a blue smoke and once it's done it stop smoking. It this normal or what is the possible problem. Is there any way to know that is doing a passive going down the road. Another thing is when sitting at a idle the check engine light comes on for a couple of minutes then goes off. Checking diagnostic it says Turbo Actuator. That is at idle does not act up going down the road. Thanks