If you are still in college, there might be a chance that you can turn your bad grades into good or even average. Opt for the extra classes. Take extra credits from the teachers. Volunteer for school work.
You can even take up a course to show your employer that your grades were just a mere misfortune and you are mature enough to handle working efficiently for them. This will show your greater zeal to learn more and will give you an advantage of being actually brilliant.