Repairs could be a couple hundred dollars, or more. Depends on what's wrong. Sometimes it just needs more fluid, or minor repairs.
If you have to replace it, that gets expensive.
Probably $1500 to $2500 dollars. On the higher end if it's a 4X4.
Try to find a reputable place to go so you don't get ripped off, ask around friends and co-workers. Good luck.