Rattling in engine throwing a P0018 code

Hello, P0018 speaks to camshaft position in relation to the crankshaft. So, it leads me to think - are cam chains stretched and there's an out of timing concern? Is there a cam phaser issue? Is there a lack of lubrication - either now, or historical that has caused a current or unresolvable concern? Hands on testing by a tech near you is needed. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops