p0012 c.e.l.

[baseballfan416]

In the past 6 months, I've had three separate instances where my check engine light has lit up. All three have been the p0012 over-retarded cam timing code. In the previous two instances, I would reset the battery, and it wouldn't come back(we're talking months between c.e.l.'s). With it coming back now a third time, I'm concerned that it may not be a faulty connection. I reset the code earlier today, cel didn't come back yet.

I've ignored it merely as an odd connection in times past because
a) it always seems to come on when I'm driving on a rough surface (i.e. 1st time was a pot hole and last two occurred while driving on uneven construction pavement)
b) it seems weather dependent (only happens when we experience somewhat drastic temp decline) and
c) the symptoms suggesting an issue are not present (no loss of mpg, hesitation, rough idle or difficulty starting).


From what I gather, the issue could potentially be an oil control valve issue (located on block by alternator)?

How does one go about removing this (only diy I could find was for corolla)? Can it be cleaned/adjusted and put back in before buying an entirely new one? Is this even something to worry about? Car's out of warranty (07 with 80k miles)...