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Hi Im David, please allow me a moment to get that information for you. thank you.
The flashing "D" is alerting you to a problem with the transmission control system.
It could just be a faulty sensor or something more major.We have seen more pressure switches go bad on the civics than actual transmission failures.
A pressure switch is an on/off type switch mounted on the transmission that is supposed to send a signal to the vehicles computer to let it know what gear the transmission has shifted into. If the switch goes bad the computer does not know what gear the transmission is in and causes the light to flash.A transmission sensor signals the engine computer the actual speed certain parts of the transmission are spinning at. If the sensor fails, the same thing can happen. The computer does not know what the transmission is doing and will cause the light to flash.
the best thing for you to do is take it to a shop, have the shop scan the transmission control module for faults and see waht faults are showing to determine what needs to be done.