Is it possible to trace the GFCI outlet you're trying to use back to the breaker panel to check the amperage of the breaker? Is the GFCI outlet tripping when you plug the #2 in or is the breaker tripping?
You should be able to plug the #2 into any outlet on a 15 amp circuit without tripping a breaker. So, to perform the tests OldeSmoker advises, first figure out the amperage of the GFCI outlet and plug something else that draws less than that amperage into that circuit to see if it trips. If it does, then you have a bad GFCI or circuit breaker. If it does not, there is a problem with the #2.
Another test, as OldeSmoker advises, is to try the same test using a different, known, 15 amp outlet. Plug the #2, then something else, into that outlet. If the #2 trips the breaker and the other item doesn't, then you have a problem with the #2.
GFCI outlets wear out. When they do, they'll trip when they shouldn't. You may have to replace the outlet.
I run my #2 on a 15 amp circuit with a GFCI outlet. I've never had a problem.