I assume that you are talking about the OBD II connection. This is located drivers side under the dash, right around where the brake pedal is. Climb down on the floor and stick your head up there. It should be seen pretty easily
TRANSMISSION FLUID
Checking automatic transmission fluid
The 5R55N transmission does not have a transmission fluid dipstick.
Refer to your scheduled maintenance guide for scheduled intervals for
fluid checks and changes. Your transmission does not consume fluid.
However, the fluid level should be checked if the transmission is not
working properly, i.e., if the transmission slips or shifts slowly or if you
notice some sign of fluid leakage.
Transmission fluid should be checked and, if required, fluid should be added by a qualified technician.
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