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You need a different scan tool, If the OD light is flashing then there are codes stored. Scan tools which can read transmission codes start at about 800$. Cheap scan tools can only retrieve engine codes. Since 1st and 2nd are good then the fault is going to be a failed direct clutch inside the transmission. Since it tries to shift and just slips this rules out the solenoids. The stored code is most likely going to 3rd and 4th gear ratio codes. The fix is a overhaul.