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Q: My car is starting not to shift right. on 2004 Buick Century

I had my transmission rebuilt about 3 years age. My ABS light is on and my no trac light is on. My car is not shifting right. Sometimes when I would stop and shut the car off for a few minutes it would start shifting again. Could the cause of that be the transmission again or could it be something else.
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We tried the speed sensor and it is doing the same thing. Other codes that came up are PO 502, PO503, C1216, C1221, C1225, C1226,C1232, C1233, C1245, C1248. Help I hope this doesn't mean the transmission needs to be rebuilt.
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