For some reason I thought this was changed in a past patch, and I know there have been threads asking for this before.
I was certain that I saw this in the patch notes before, and it was irritating the last time my pass ran out and I used a bunch of CE without realizing I had to renew my pass.
Yet again, I logged on, used my ME for the day, and started playing levels, only to notice I'd been using CE for hours before I realized that it had expired.
I used nearly 100 CE when I would have readily renewed my pass, or just logged off to do something else if I'd known my pass had expired.
Please put a notification like the trinket and weapon slot upgrades get for elevator pass expiration!
Even though when you go to the elevator the button to go down says 10E instead of 0E, it is inconvenient to only find out your pass has expired when you need to use it at that exact moment and you only have ten seconds before it uses the energy to go down anyway.