There is almost no reference to paccakabuddhas in the Suttas....almost everything you will find wil be commentarial and frankly for me alot of it seems mythological. While I do think that some people attain enlighltenment without hearing about the Buddha's teachings I don't think that the Buddha had much to say about them and I think the commentaries are mostly confusing and off the mark.....but this is just my view....
P.S. Here's a link to an essay that deals with paccakabuddhahood pretty well I think:
The Paccekabuddha: A Buddhist Ascetic
A Study of the Concept of the Paccekabuddha in Pali Canonical and Commentarial Literature
Buddhist Publication Society
Kandy• Sri Lankahttp://www.bps.lk/olib/wh/wh305.pdf
You can check to see if what I posted is correct of not.....sometimes my memory isn't so good and I get things wrong.