Hello. I'm in a 2005 Acura TL with just shy of 200k miles. I've gotten all the routine maintenance done on it since I bought the car 6 months ago. Since I've been driving it it had a blinking drive light, but shifts smoothly. I thought it was part of the car and even took it on a 500 Mile road trip with no issues. I also bought it with no service history so I've been replacing things intermittently as I get the money.

I just found out about the dreaded blink and have done what research I can to figure it out.

I got a 3x3 flush on the ATF and the light went away. Now it is coming back only after driving it for about 30 minutes and goes away when I turn the car off. I am starting to notice some slipping between 2nd and 3rd gear and sometimes it takes a sec to engage going from reverse to drive. The light has also turned completely off after a long day of commutes and the tranny stuck in third and then it seemed like the ECU reset and it started shifting perfectly fine and the light went solid. I haven't been able to replicate it since no matter how hard I push the car. None of the issues are consistent either. One trip will be perfectly fine and another will have one slip and the. The gears shift smoothly after. It's nerve wracking.

I have plans to replace the pressure switches and do another flush because I'm going to be down there anyways. Does anyone have any recommendations or know what the problem could be? I'm in college and can't afford to take it to a mechanic or the dealer. I will be getting it scanned once I get a scan tool, but I don't know if the transmission is scanable with OBD2.

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This D light is a signal that you have a transmission issue, and a blinking light means that you have to address this now. It could be just a low transmission fluid level, so check this first. If fluid is good, could be a mechanical fault, a shift solenoid, or a pressure switch.
You need to pull codes to see what they will tell you.
Also check out this video:

 

You can go to a place that has the Honda Diagnostic system or a good scanner and they can pull the code that the car is giving for the blinking D light.