1. Attach scan tool to the data link connector and check for any codes.
2. Warm up engine and transmission, drain the transmission fluid, and refill with Mobil 1 Synthetic Multi-Vehicle ATF. Synthetic transmission fluids perform much better than conventional ATF, particularly in winter. Verify first that the Mobil 1 product meets the specs for your Accord. If this doesn't improve the situation, then you are likely facing a rebuild. Transmission problems normally stem from not changing the transmission fluid regularly.
3. If the transmission is sludged up, drain the transmission fluid, and add AutoRX to conventional transmission fluid. Go through the cleaning and rinse phases with conventional ATF, then switch to synthetic ATF.
4. The link below may help you:
https://www.askmehelpdesk.com/cars-t...tml#post219991