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What is your question?
I literally just put a rebuilt transmission in 2000 Honda Accord 25 miles ago. Everything was fine until the check engine light came on at mile 17ish. Is it possible a sensor came unplugged causing these two codes? Does it relate to the wheel speed/abs sensor at all? I know that I cracked that and need to replace it, but I didn't figure that it would have anything to do with the transmission. Any ideas?

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The P0730 is a "gear ratio incorrect" code. The reason this code comes up is because the computer has detected variations of speeds between the shafts inside the transmission. It's usually caused by worn clutches allowing slipping. You may or may not notice the slip but the computer has.The only thing you can do is replace or rebuild the transmission. The P0780 code you are showing would mean to replace the transmission because the problem is internally affecting your solenoids and Honda has found out that just replacing the solenoids will not fix the problem. Unfortunately, your transmission needs to be rebuilt or replaced!!
I literally just had it replaced. 20 miles ago. Is it possible that it's just low on fluid and or the clutches are still obsorbing?
take it back to whoever rebuilt it.these transmissions are a common failure on you car and depending on mileage and year,Honda would buy the transmission and all you had to pay was the labor.my friends went out on hers and Honda told her it was under a warranty that she didn't even know about.all she paid was shipping cost,several years ago.