Flying my P2V+ V2 today. suddenly I got an MCU Error on my screen. All lights went red. I landed. Powered off restarted. Flew the rest of the battery cycle no problem. Can anyone explain an MCU error?

Please plug your Phantom into the Phantom Assistant and tell us what you see, at this point, too generic to guess but we could guess and send you on a wild goose chase in the process.
Please also check the manual as there are several references to the light sequences that may you give you a better indication first hand of what is going on.
Please let us know what you find.

As Mr. North said, we need more information to help effectively.  Always, the more information, the better.

I connected to the assistant.  Everything looks good.  I did an Advanced Calibration.  Got the green light.  I'l  look in the Manual,  I tried to Google what an MCU was and wasn't successful.

csiami Posted at 2015-3-30 10:32
I connected to the assistant.  Everything looks good.  I did an Advanced Calibration.  Got the green ...

MCU = Master Control Unit = Your Phantom's Brain has an issue, intermittent or otherwise and needs to be fixed...check out...

Also check this out...http://forum.dji.com/forum.php?m ... ght=mcu&lang=en
Are you using Android?

Yes was using Ken's app on an android tablet.  I'll pull the cover and inspect for damage.  I did have a crash about ten flights ago.