Colleges will consider other things besides current class grades when trying to transfer with a low GPA.
True: Some colleges have a guideline of looking at high school grades more closely if the student has earned less than (for example) 24 credits. Above that they will look at college grades more strongly, so being admitted on good high school grades would be more likely during a freshman vs. junior year.
If a student does poorly at one college they can simply re-apply as a freshman at another college.
False: Colleges consider students that took classes at any educational institution after high school as a transfer student, so they may not apply as a freshman. Colleges often consider it to be dishonesty if a student conceals that they attended elsewhere, and they risk expulsion if it is discovered they concealed attending a school.
It becomes harder to transfer with a low GPA as a student progresses further in college.
True: Some colleges will actually admit a transfer student based on their high school grades if they have not earned many college credits, so it can become harder to transfer the further along in college a student progresses if they are earning poor grades.
Four-year colleges want to see one or two successful community college classes before they will accept a student at their school after they did poorly at another college.
True: Four-year colleges usually say they want to see 12-24 credits of good grades at a community college before they will consider a low GPA student at their school. In semester hours, 12-24 credits is four to eight classes.
It is impossible to transfer to another four-year college with a GPA below a 2.0.
False: While it can be difficult to transfer with a low GPA, some colleges (under certain circumstances) will accept a student if their GPA at their first college was below a 2.0.