I've read tons of info on this, but I don't know how to fix it.

I get code P0508
I cleaned the idle air control value with PB blaster, fogging oil, heavy duty electrical cleaner (a little because it's more of a solvent) and I cleaned and applied electrical grease on the IAC connector.

It is strange because I got this code right after I did some AC work and I remember my arm was pushing on the IAC valve connnector a lot.
Enough that it left marks on my arm and I had to unplug it the get to the AC low-pressure port more easily, if I remember correctly.
I also had to put a long sleeve on my arm because the connector was gouging my arm, so it had a lot of force on it probably.
Only car I've owned where the AC low port is so hard to get not, not sure why.

 

Just updated this post because of the P0508 code.

 

For future reference to other unfortunate Pacifica owners this was caused by connector 3 or orange/black connector or 3rd one from the top on the PCM or computer module.

3 of the 4 wire groups that go to the PCM are routed through a solid plastic piece with a hole in the middle, but seem like the 4th wire they couldn't get through there so they just routed it under this plastic piece, between the frame and engine and engine mount. Gets real chompy when your mount gets more worn or broken and cuts through the wires.

 

Cool, thanks for update.

 

There was a recall on this. If it happens again, bring it to a Chrysler dealer and they should be able to fix it.