My truck threw a CEL after the first start today. The CTS reports it twice. I noticed it about two minutes after start.
P02E1 - Diesel Intake Air Flow Control Performance

The air box gauge is green and it doesn't reset when I push it so that appears to be fine.

The one thing I can easily notice is the sound of the turbo. Typically when I stop and park, the turbo spools up, then down, then spools again and gives a sigh of relief and it's then silent. It's not doing that currently.
Now, I can hear it constantly when parked and it spools down after I turn off the engine, even two minutes later. That is not normal for my truck when I wait for the above to finish its routine. When I start the truck, the turbo immediately spools to where I can hear it which is also not normal, as if it's building 0.5 psi. I realize that's funny to say on a turbo diesel but I know the sounds of my truck. The EGT's are fine, EOT, ECT, TFT are fine and I can build boost when driving without issue. I took the drive to work easy this morning so the highest I noticed was 10 psi.

I restarted the truck after a 20 minute drive to the office and it didn't clear the CEL. The CTS squawked four times when it woke up the second time but it didn't show me which PID it was upset about.

I'm thinking this has nothing to do with the CAI and this is something downstream of there. Any ideas? EGR related?
I haven't opened the air box yet, at work and in dress clothes so that'll need to wait.

More details for you. My past four or five regenerations all started between 1.94 and 1.97 soot gpl. That is also not normal and is something I have been keeping my eyes on. Currently the DPF is at 2.10 so it has made it further. Normal behavior (post emissions flash) is above 2.54 soot gpl for an AR.

Thanks all!

 

Updated info for the purpose of this post. Just throwing out as much detail as I can.

I decided tonight after checking the air filter, which was in good shape, I would run a manual regeneration based on the previous early regenerations even with the most recent regen finishing during four hours of highway driving. Something in the exhaust flow had to be below parameters and caused the CEL because the manual regen resolved the issue, at least for now.

Once that was done, I took it for a drive and took it to 22 psi boost several times and the CEL didn't return and nothing broke.
Once I was back home, cleared the code, shut the engine off, restarted, put in drive and the code didn't return. I'll see what happens over the next few days. If it's this simple, I'll take it. Better than a plugged EGR system or something. The turbo is back to its normal spool down routine as well, which is just interesting and I wish I understood what the computer modules were commanding the engine to do with the CEL activated. Also, no drive to clean messages and I've never seen that message.

This smoke was a new experience as well. Lots of new behavior from my truck lately.

 

I get this code, but it is because of tuning. Have you tried cleaning your MAF sensor?

 

No and good idea. The air box and intake pipe is spotless though. I did look that over. My truck is all stock.

 

I've read (I think) where a faulty MAF sensor can cause this.