CEL Code 45...what is this?

I tried looking up what code this is but came up with nothing...it seems the codes skip this number...what is this? my jeep randomly started throwing code 45 last night

I don't see a code 45 listed either.

In my case it indicated a transmission fault. Two of them. I had 45X2. I got rid of one of them: was the NSS. I can't figure out what the other fault is, but it's transmission related.

From Go Jeeps Website

Code 45:
Trans temperature/ Governor pressure voltage out of range. Less than 1.55 or above 3.73volts for temperature and less than .1 or above 4.89 volts. Trans temp. to high or low. OD switch input too low for more than 5 mins.

45 is an OBDII code, since you have a '97 that should be correct.