What do these codes mean, p2503 u1402? Had to have alternator replaced.

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Have had problems with my 06 dodge Daytona since I got it. Had to have sunroof replaced, tie rods replaced, battery in trunk replaced. Ebs light stayed on. Gear shifter stuck had to have that replaced ,gas, filled up n car stalled constantly till I wasted 1/4 of my gas. Airbags replaced. This was all out of my pocket cause they claim there was no recalls on any of the problems I have had. Now the alternator....