O8 Cummins emissions

Hey my 08 3500 Cummins has been throwing various emissions codes. They are never present when I check with a code reader but show as stored codes. I changed the air filter and crankcase breather. It did about 100 miles and then threw code p2002 witch is the particulate filter. First I dont even know what that is. 2nd I was told maybe someone tried deleting the emissions and its confusing the computer. Any thoughts?

Here's some info,

https://www.cumminsforum.com/forum/2010-2012-general-discussion/1941802-p2002-help.html