My bora automatic gear can't change from 1st to 2nd after a long trip. Engine s sensore lights. I can smel gear oil very heat. When the car get cold it run normally. Engine s sensore lights off. n.b. I have this problem deacresing after oil changing

My v w bora 2001 automatic gear can't change from 1st to 2nd after a long trip. Engine s sensore lights. I can smel gear oil very heat. When the car get cold it run normally. Engine s sensore lights off. n.b. I have this problem deacresing after gear oil changing