Whenever I take a picture with my dslr, there is a strange line that shows up on the left of the picture all the time. Can this be fixed my myself, or do I have to send this one in?
CMOS sensors are read a line at a time. This appears like it may be damage to the sensor causing that line to not be read (though I thought they were normally horizontal rather than vertical). My guess is that this will probably require servicing and possibly a new sensor to fix. There may also be a way they can treat them all as dead pixels and have it still work, but I'm not sure if they have that level of calibration or not.
Other things you might be able to try is doing dust delete for it and/or seeing if there is a dead pixel remap function available for your camera. While the dust delete will simply subtract the line from the image, the dead pixel map will alter the demosaicing as described in Michael Clark's comment so that some of the information can be recovered. That I don't know off the top of my head, though personally, with that many pixels being a problem, I'd personally send it in.