Lots of auto boxes need diagnostic equipment to check the fluid level, however lots of boxes also have a facility where a bung or a plug can be removed and a temporary dipstick fitted for the purpose of initial filling and with the correct service tool/dipstick it will also serve for in-service level checking.

No dipstick as to the check engine have vehicle scanned for code most auto stores offer this service for free the code will help in correcting your problem

There is no dipstick you have to take it to a Saturn shop or gm to get it checked there is a technic to check it.