02 CRV--Transmission Sensor Switch Problem?

I have a 2002 Honda CRV with nearly 80,000 miles. I've had for about 2
years and it runs very well. Just recently, the drive button ("D")
started blinking. I checked the manual and it said it may be a
transmission problem. I took the car to Autozone and they read the code
and said it is a problem with the "transmission sensor switch". They
wouldn't really say anything else. Can someone tell me how serious a
problem this is, what to expect in terms of cost of repair, how major a
repair it is, etc. Thank you.

 

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At 80,000 miles, I'd drain-n-fill the tranny with Honda Z1 ATF, drive it
a week, and do it again. You need to tell us the actual numeric code
that they wrote down. Interpretation doesn't cut it.

'Curly'

 

Code is P0845--"Problem in 3rd Clutch Pressure Switch Circuit"

How serious is this? What should cost to fix be, approximately?

 

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'Curly'