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If I rember correctly.... The TCC will Lock up in 3 as well as D.... Put it in 3... drive it around (say to 55mph)... look at the RPM's of the engine. Then tap the brake (without letting up on the gas).. not enough to start stopping, just enough to turn on the brake lights. If you see the RPM's go up around 3-400 then the TCC is working.
Probably something wrong with a sensor, since they are computer controlled. Take it to a shop and have them scan the tranny computer for trouble codes... As tranny codes usually don't set off the check enging light.
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