My employer did not request a transcript. Some don't, but some will.
You need to ask your self the question "Do I really want to work for company, who would reject someone for one C+?"
An employer may care more about you GPA for a first job with no experience. For a second job forward, your interviewing skills, your work experience, and the type of work relative to the job you are applying for count the most.
It is my experience that grades do not make the engineer, but work ethic and personality do.