2012 Town and Country P0016

Ok. Not good. I pulled the timing cover back off and found that the timing chain for bank 1 had slipped teeth on the exhaust cam ONLY. The other 3 cams were still aligned correctly. I found my new timing chain for bank one had stretched significantly. I pulled the exhaust camshaft and found it showed signs of significant wear on the frontmost lobe for cylinder 1. I suspected I would have a bunch of bent valves so I pulled the head. A real head scratcher. All of the valves looked fine but i took out the valve that correlated to the worn cam lobe. Nothing amiss....looks completely fine. Completely uniform and true. So what would cause the cam lobe to wear if the valve is good? Seems it could only be lack of oil. So this is where I am stuck right now. I want to make sure there is nothing hampering oil delivery to that lifter/lobe/valve guide area somehow. Getting that valve spring back on is going to be a real booger!

Ok. All good now...I think. We got her on the road and made a 200 mile trip with no problems. How did i fix it? I still had the old timing chains and put them back on. For bank1 i put on a new tensioner. The worn camshaft was not badly worn could not see or feel a ridge so I just used it. Got new headgasket and new head bolts. torqued it all down and reassembled everything. In fact, that makes it sound a whole lot easier than it is. used RTV to put timing chain cover and oil pan back on. She fired up first time. I erased all the codes and everything seems good now. I notice a slight an only occasional unevenness in the idle...i'm looking into that but am not really worried about it. She gets 25mpg on the highway at 75mph. Almost like new....so I'm happy. Just an FYI... you do NOT have to remove the alternator, airconditioner compressor or powersteering pump to pull the timing chain cover. But you DO have to pull the lower oil pan.

Update. Arghhhh! The P0016 is still here....or perhaps just came back. It is difficult to know if you actually got rid of it since it take 2 drive cycles to set it. And now the gas mileage has dropped and sometimes get random misfire codes. But with all that, it still runs dependably. I'm not worried to take it on a trip. Though it is probably going to mess up the catalytic converter driving it like this. Does anybody know if there is a code for same problem on bank 2? P0016 is crankshaft camshaft bank 1 correlation problem...does that mean the bank 2 is ok?

Ok....answered my own question earlier. Dont get old...it is amazing how quickly you can forget something. Ok if both banks think the crank is out of sync....then more likely it truly is. But since i know for a fact that it is not...that points to a crank shaft sensor problem. But it is new...so either it is an electrical issue or the flex plate could have slipped. Guess that is my next project. Will have to pull the transmission to get a really good look at the flex plate. Double Rats!

I know this is an old thread, but I wanted to say thank you for all the info. A friend of mine's van just popped up the p0016 code. We haven't started working on it yet, so when I googled it your thread came up. Thanks again! I hope everything worked out ok in the end