Before I get jumped on to use the search...I did. Googled it. Read through probably 50+ threads on various sites and forums.
Sad part was none I found had an answer at the end of them. Whomever started the threads with the code never had an answer to what fixed it.
So here we go again...
History. One year ago...Basically whole new top half of engine...From the block up. Truck was perfect for over 20K miles.
Got the code.
Ok, easy stuff first. Swapped cam sensors. No change.
Swapped VCT's. No change.
Tested oil pressure. Ford says 55-75 PSI at 2000 RPM. I am at 65 PSI and a little over 75 PSI revved up.
OK order new phaser from Tasca. I am a little under a year so they will warrantee it. Change phaser. Tensioners are tight. Timing didn't move.(At least I think it didn't) Guides are there. No change.
So every thing Ford says to do and check doesn't fix it...
Computer problem? Is the truck not advancing because
the computer isn't telling it to? Is it a wiring problem?
Any insight would be helpful not only to me but everyone else you has this and no answers.
Anybody fix this somehow in a similar situation?

 

What phaser did you replace? The passenger side?
If it was a dorman phaser then there is a good chance it failed already, they are turning out to be junk as replacement phasers.
Your problem should be on the passenger side judging by the code.
My guess is that it could honestly be the passenger side phaser.

 

All Ford parts...Phaser was the last thing done.
And yes...Didn't mention it but it's the passenger side.

 

Then it could be a plugged up passenger side VCT valve body as my next guess... Keep in mind, if I'm wrong, my next guess is the VCT solenoid.

 

At least you have ideas...I do appreciate it. I blew out the place the vct sits in best I could. And I swapped the vct valves and then replaced it also. No difference. Might have too change out that too if it could be plugged.

 

Maybe a good 15 - 20 minute engine flush additive run through the motor might clear it up if that's the problem...

 

I did that too...Have an appointment with a mobile diagnostic guy today...Not going to the dealer for this. He can graph it just the same.
Thanks for the input.
We'll see what he comes up with.

 

Well I'll complete this thread...Fixed the problem.
The diagnostic guy after a week of banging his head against the wall said my timing chain jumped a link.
All his testing showed all parts were functioning correctly. VCT's, phasers were advancing no problem. But I had the code still and it ran like crap.
So, ordered new chains, tensioners and guides from Tasca Ford.
I had done all of these a year prior. And changed the VCT and phaser a second time in hopes of that being the fix.
BUT...the tensioners I used were Cloyes. That's the important part...
Took it all apart Friday night. Everything looks normal. Of course can't tell if the old chain jumped a like cause the colored links aren't there anymore. Tensioners are tight. All looks fine.
Get the phasers off, guides and chains. Take off the tensioners...Guess what? The gaskets failed. A section no more than a quarter of an inch is blown out. NICE. Parts less than a year old fail.
Put it all back together. Fire it up and sounds like a new truck. Runs perfect.
Moral to the story....Only use Ford parts.
The code was there because these was not enough tension on the chains so when the phaser was advancing it was turning but taking up the slack and not advancing the timing. It never jumped a tooth. Failed tensioner.
That's it.
This is what fixed my P0012 code. Hope it helps someone ion the future.

 

After reading countless threads on failed aftermarket tensioners and dorman phasers, if I have to re-do the timing/phasers in mine I will definitely stick to all motorcraft parts. Some of the aftermarket parts are getting so cheap that I'll be using motorcraft more than I used to for many parts throughout the truck.