D4 Blinking usually indicates transmission issues, but it can also be triggered by issues with the ECU or Main Relay, which would prevent your fuel pump from priming. You should check the transmission trouble code, your main relay, and your ECU.
D4 is a transmission problem. It wouldn't cause the car not to start. If you don't hear the pump coming on when the key is turned on, Most likely the pump died. Could be the fuse or wiring also. Check grounds. Both could be a bad ground.
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