Solved Auto level crashing bed?

Hello. When I run the auto level it starts by homing the y and x then it does the first 6 points like normal. But when it gets to the back row of points the bed goes all the way and makes a terrible crashing sound. Do I have to change the limits in the firmware? How do I fix this. I really don't want to have to mod the firmware.

Thanks.

 

I actually figured it out. The bed ribbon was getting caught. Thanks.