Try following the diagnostic procedure on
page EC-144 of the factory service manual to help diagnose your P0110 code.
And check the fluid level and condition as Chuck said above. Follow these steps to check the fluid properly:
1. Drive around for 10 minutes in the city after the transmission is at operating temperature.
2. Park on a level surface and apply the parking brake.
3. With P selected, shift through every gear and return to P.
4. Pull the transmission dipstick with the engine idling, wipe it clean, reinsert it completely, and read the level. It must be within the notched area labeled "HOT". Check for fluid contamination after wiping on a paper towel.
The fluid should be red, and not smell burnt.