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Soi drove thru so high water three weeks ago n 20 min later at a stopsign it stopped n wont go into gear since

 
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Check for blown fuses
does it start?
Any check engine light?
Automatic or manual?
what year?

 
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dint know how to check fuses
Yes the engine light is on first it was coming up irregular gear ratio
Once tht was cleared now keeps throwing sumthing about a heater sensor issue

 
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Its a 2005 honda civic automatic

 
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Buy a $20 multimeter and watch a YouTube on how to check fuses. Could have water in the connectors as well.

 
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Changed the thread title to something more informative.

 
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I suspect two things, your gear range selector which is really low on the case might have water in it (even though it should be sealed).
Or your tranny dipstick was loose and let water into the case. These cars over 100k miles always have loose dipsticks when people dont take care of them. If you went through water that was significantly higher than the dipstick hole, (around the middle of the wheel) pressure could force water in there.

If water got in there, it could screw up the hydraulic manifold. Because water is the nemesis to transmissions, that would be really bad. Thats a rebuild. Water turns manifold gaskets into glue.
Look at the transmission oil to see if its milky.