Hi there, I live in Colombia South America and I have a HYUNDAI Elantra 2001 automatic transmission and it behaves exactly like yours. I have the best mechanic guy intown and also the dealer garage take down the whole transmission and nothing changed. It seems now to be something with the electric wiring system.
I would recommend you to have the electric system checked.
Good luck.
Automatic transmission :Genuine Diamond automatic transmission fluid SP-11M.
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For Manual transmission :SAE 75W/90 gear oil
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