For those that have a tick they can't figure out, here is a possibility. I was getting no codes other than P0324 occasionally. Ticking when cold but sometimes ok when warm. Loss of power and rough shifting ... sometimes. Opened up valve cover to find this. Tightened it to 71 lb in (inches not feet) and put it all back together. Runs almost like new! 2013 206000 km.
Chevrolet Cruze Ecotec 1.4 P0324 Intermittent Ticking
Chevrolet Cruze Ecotec 1.4 P0324 Intermittent Ticking