While charging at my parents condo garage, this is what I experienced. I had to use extension cord, 12 gauge, on advise of others in another thread. I would sometimes get a "extension cord detected" warning on my 1.5 - however, the charging would continue. This of course, worries me. So playing around with it, I found that if I just wiggle the connection between the extension cord and charging cable, I would hear a clicking sound, the ready light would go off for a second, but come back on. The 110 socket in the garage doesn't appear to be GFCI as it doesn't have a reset switch on the plate. And if I remember correct, a 'double GFCI' situation would trigger a GFCI fault code not a "extension cord detected" fault. And if it is a double GFCI issue, where's that thread with the 'hack' to solve it. I can't find it. Thanks.