Verified answer

The issue is with the torque converter clutch solenoid valve for the automatic transmission.

The torque converter clutch solenoid valve switches the hydraulic circuit to engage/disengage the torque converter clutch.

When the torque converter clutch solenoid valve is turned ON, hydraulic pressure is applied to the torque converter clutch.

When the torque converter clutch solenoid valve is turned OFF, hydraulic pressure to the torque converter clutch is interrupted.

The powertrain control module (PCM) controls the torque converter clutch solenoid valve. The driver circuit has a

diagnostic function that detects and outputs the state of a short or open circuit, and sends a return signal to the PCM. If the

return signal during the PCM’s command is not appropriate, the PCM detects a malfunction and stores a DTC.

basically what that means is the problem is electrical, not hydraulic or internal. you need to see if the solenoid valve is connected, if the terminal got smashed or if the connector is just hanging there. if the connector is in place and not damaged you'll have to replace the solenoid valve

the flashing D light means the torque converter isn't locking up when it is supposed to. fixing the torque converter solenoid valve will fix the blinking d light.

hope that helps

see a photo of the soleniod