Eh. Give it a few more miles. It'll start throwing codes. Your '03 has changes built in over the 97-01 years. Different style pump, solenoids, gaskets, seals that made the later versions more reliable, but didn't do anything to make them last longer overall. The earlier models would throw codes faster, because the root problems affected more things. Root problems being neglected broken down trans fluid, friction debris, and heat.
Hopefully you just have a clogged trans filter. It's true maybe 5-10% of the time.
My 98 was fine, except for a little too much slippage in 1st. Then Bang. Codes, massive slippage with hammering 2-3 shifts and no 4th. On the rebuild I found Torn input seals, sections of missing valve body gasket, fried 3rd clutches, slow pressure switches, worn pump shaft and 4th shaft splines, on and on ..... The car was at 113k mi, and driven fairly gently. 4t65e transmissions are Great. For about 50k miles. After that it's a crap shoot, and there is no "repairing" a problem. Just full rebuilds.
