I wouldn't say it is a common problem that one grip isn't working, the common problem was that they wouldn't sufficiently heat. I would guess that you have a broken wire inside the grip some place. I would take a multi-meter, check for continuity in the grip to see if you have a broken wire. If it doesn't, check the resistance and compare it to the right grip that way you can narrow it down if it is the grips or not. They both plug in underneath the gauge pod in a rubber boot. There is a pile of connectors in the rubber boot so you will have to trace them down from the grips and test them.