Now I am just shooting in the dark here, and this is what I would maybe do if it was me. I know there are two connectors that go into the back on the message center, one white, one black, I just had my center console out recently. What I would maybe try to do if it was me is try to find and isolate the problem. Now I don't know if this would work or not, but maybe try have the power on to the truck and try only having one of those connects that go into the message center pluged in at one time.
My theory here is. MAYBE, like you said it could be the message center or something else. If it was MAYBE the message center, having one of two of those connectors might only supply power to the unit and not information. Meaning you could see if the message center still puts off the message with just power to the unit, If thats even possible. And if maybe that was the issue you could go about getting a new message center, Maybe even the button is broke on the message center for the oil reset. Who knows. At least you might get some more information that way.
Now if it is something else then the message center, I do not know where the information comes from (sensor w.e). Someone else more knowledge might be able to help on that or you might have luck looking on here.
