Have 1990 Honda Accord EX, it's locked in high gear with the Super light on, I can drive it by manually shifting the gears. How can I fix it back to Automatic

SOURCE: Rough shifting automatic transmission on Honda Accord from 1st to 2nd gear

it has a problem with the second gear drum it cracks and does not fully engauge the n shifts to 3rd ..many honda owners also learn the 8 bucks a quart is the only fluid to pour in a honda..but remember 3 qaurts per drain and fill the tranny holds 7q ....it will take a case to do a drain flush...a high pressure flush will ruin a automatic tranny with alot of miles or metal deposits floating around inside..DRAIN AND FILL 3 QUARTS AT A TIME NO GASKET NEEDED ITS BUILT AND DESIGNED LIKE A MANUAL TRANNY

SOURCE: 92 Accord Automatic shifting

Has anyone change the transmission fluid and used anything other than Honda ATF-Z1. If so, have the fluid/filter changed in this car and use only Honda Fluid. This is the only fluid that you can use in a Honda. Even if you have used the correct fluid an fluid/filter change may help. If that is not the case then I suggest you seek out a trusted professional.

SOURCE: 96 honda accord ex transmission shift problem

the first common possibilty would be to check fluid level, if the fluid level is good, I would recommend changing the transaxle fluid and filter. if this does not correct the issue, a professional transmission repair person will need to diagnose for you, good luck!

SOURCE: 1992 Honda Accord Station Wagon stuck in 2nd Gear

If it won't shift down to 1st when you come to a stop but you can shift it down manually its probably the tranny computer located under the carpet on the frnt passenger side floor. 1991- 1993 had weak electronics in the computers go to a junkyard and get a new one. if not the right symptom refer to comment 1

SOURCE: My honda accord 2003 automatic wont let me put

Sounds like your brake interlock is not working. You can manually override it. Check your owners manual, but there should be a small square around the trim around the shifter. Pry up the square and there is a release mechanism to manually release the solenoid. It should be covered in your owners manual how to override it.
I think to replace it you need to take apart the shifter trim.