Where is the transmission drain plug located in a 2007 saturn ion

Here's a video on your fuses. Interior Fuse Box Location 2003 2007 Saturn Ion 1 2003 Saturn Ion 1 2 2L 4...

Transmission Fluid Replacement 2002 2007 Saturn Vue

are there any codes

There isn't a drain plug you have to pull the whole pan off the bottom of the trans and if you change the fluid you also need to change the filter which is located under the pan once you remove it.

On this website you find fuse box diagram diagram and description for Saturn ION (2007)

Saturn ION 2006 2007 fuse box diagram Auto Genius

Your car takes Dextron III automatic transmission fluid.

Oil drain plug is its on the back passenger side of the engine out of sight unless you under the car itself .

It's a cartridge filter that goes into a canister.You'll need a 32mm oil filter canister socket to remove the cover to access the filter. You can find it at PepBoys for less than $10 by the other oil change supplies.

the drain plug and fill plug are on the drivers side right next to the subframe,the fill plug is back and above the left axle ,i get it from the drivers side with the wheel off and the drain plug you get from under the car ,,thats a tight one i actaully had to cut a allen wrench down to fit inbetween the trans and axle and its tight both to get the wrench in and realy tight to loosen use a breaker bar,,,,the fill plug is also tight,,,

Good day
If I remember the drain plug is on the right side (pass) of the oil pan. not on the bottom but the side close to the bottom
hope this helps

Cheers