Actually yeah, my school requires that you have a semester GPA of 2.5 to progress to the next semester without being put on probation. If, while your on probation, you make below a 2.5 for that semester, you go in front of a review board and they decide whether or not to let you continue.
Also, you have to have an overall GPA of 2.5 and pass Step 1 to progress to year 3.
FYI: we operate on an A/A-/B+/B/B-/C+/C/C-/D/F system