Sorry if I did a poor job of making my answer understandable. The point I was trying to make is if the car won't move because it's low on transmission fluid, where did it go? There's a good eight or nine quarts in there, and it would need to be probably three to five quarts low to not move at all. That's a really serious leak. If there's a slower leak, you would have had a pile of other symptoms for quite a while before this.
If the level is low, the cause needs to be addressed. If the level is normal, adding fluid won't fix anything. Filling the fluid too full can cause rotating parts to whip up the fluid and whip air into it. Since air compresses, it prevents the clutch packs from applying with full pressure. The resulting slippage will do a lot of serious damage in very short order.
What led up to this? You said you're stuck on the highway, so obviously the car was moving up to that point. Was it driving and shifting normally, then suddenly stopped moving? Is there a red puddle under the front of the car? If the cooler got hit or a seal started leaking, adding fluid might get you off the highway, but that's an expensive way to go a fraction of a mile.
My normal reference material doesn't show a picture of the transmission, but there are a few things I can share. First, some manufacturers have gone to sealed transmissions with no dipsticks or places to add. Special equipment is needed to inject the fluid. We haven't figured out the advantage of that other than to force people to go back to the dealer. GM owners already know all about that customer-unfriendly business practice. If you DO have a dipstick, they're pretty well-marked by all manufacturers now.
What is more likely is a computer problem. Your transmission is computer-controlled. Chrysler products will default to second gear so you can still drive the car slowly to a repair shop. Other manufacturers that copied the design usually did something similar, but that is not always the case.
You should also observe if the shift lever feels normal or if it moves too easily. If you don't feel the normal resistance or feel the clicks, the cable likely is disconnected on one end. That is more common than you'd think, and it's usually an easy and inexpensive fix.
Thursday, October 2nd, 2014 AT 10:19 PM