[SGDM]

I was cruising at 60 mph in D and rpm spiked, I let off throttle, rpm settled, pressed throttle and nothing. I coasted into parking lot, popped hood, checked underneath-no fluid, nothing in engine bay. I ran diagnostics on Dash Command and no codes. 15,100 miles on car. I checked trans temp - 150 deg. Turned car off, started car and tried D, R, and manual. No go...

Any suggestions??? Ugh!