The charger that came with my Volt appears to have broken inside the plug. It still works but I can't imagine this is safe. Since it's a certified pre-owned car is it possible this might be covered under warranty? I was going to superglue the one piece I still have then thought better. What if it breaks off inside the car socket? I looked closer and realized that the others are cracked as well. Is this common? So one prong is missing the plastic sleeve. I found another plastic sleeve nearby on the ground. There's at least one more that's cracked at the base.