How do i fix a flashing overdrive light and an OBD2 code PO743 in Ford Crown Victoria

Question edited for clarity.
Question moved to model category.

Did you disconnect the battery recently before this happened? Is the anti theft light flashing?

https://www.google.com/search?q=1999+Ford+Crown+Victoria.+Cranks%2C+no+start

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P0743 Torque Converter Clutch Circuit Electrical
P0760 Shift Solenoid C Malfunction

if overdrive still works then its the bulb in shift handle end

Well it may not be a big enough problem to need to replace the trans.
It could be a solenoid or something electrical.
You need to know what the trouble codes are in the computer, and you may need to have a transmission shop take a look.
What you are saying is the trans will not shift into overdrive, hitting the button turns the overdrive off.

Take it to a repair shop & then use the
computer to study OBD2 Systems & get
a cheap code reader

Look at a fuse,they do not fix anything
& hardy ever blow.

When you say check light has been on for awhile
Are you not aware of why the dash light come on?
They have been on all vehicles for 31 years now

Any dash light is a System Malfunction,& you need to
check for codes within a couple of days or stop using
the car,each & every time,unless you understand the
current OBD2 Systems & have at least a code reader

Hi Rod, Your vehicle needs to be taken to a shop who have the correct scan tool for your vehicle. The scan will display what part is defective. The flashing light shows the need for attention and where the attention is required. As an example; if the engine check light is flashing that unit will be the centre of the investigation. When the overdrive light flashes, the problem is with the gearbox. Regards Johngee10

If your overdrive light is flashing, it is trying to tell you that there is a transmission failure. You will have to scan your powertrain control module to find out what is wrong.

Your Ford is in 'limp mode,' which is designed to protect the engine/transmission from damage when the car's computer detects a problem. You are going to have to check for any codes stored in the cars computer to help determine what is wrong. Most major auto parts stores will scan for trouble codes for free, they will plug a hand held scanner into the cars port, and read any codes. Since the overdrive light is flashing, it is obviously a transmission related problem.

electronic shift control bad. you would have to take to tranmission shop to be checked by computer or shift control linkage to throttle body needs adjusting. berrydalewolf

i think you got a bad transmission...thats what it sounds like anyway