The automatic transmission does not have a transmission fluid dipstick.
Have an authorized dealer check and change the transmission fluid at the correct service interval.   See   Scheduled Maintenance.  Your transmission does not consume fluid. However, if the transmission slips, shifts slowly or if you notice a sign of leaking fluid, contact an authorized dealer.
Do not use supplemental transmission fluid additives, treatments or cleaning agents. The use of these materials may affect transmission operation and result in damage to internal transmission components.