Mine has been ON for about 1.5 years now.
No matter what I do, I cannot get rid of it. Damn IMRC!
Replaced IMRC (3 times)
UIM/LIM rebuild and clean
2.5L died, replaced with 3L, still same code after swap
Changed IMRC grommets
Changed ECU
Only thing left is wire harness damaged. I finally have a parts car I can get the harness from, but now I need to find the time to swap them.