from what I can find out it's inside the tranny.
part #11 Valve body Solenoid
The solenoid valve body assembly contains the transmission fluid temperature (TFT) sensor,
as well as five powertrain control module (PCM)-controlled output devices:
electronic pressure control (EPC) solenoid
shift solenoid No. 1 (SS1)
sift solenoid No. 2 (SS2)
3-2 timing/coast clutch solenoid (3-2 T/CCS)
torque converter clutch (TCC) solenoid 
