Last month someone rear ended me and I had to get my bumper replaced. I received an error message that said "service side sensors". The bodyshop told me to take the Bolt to the dealer which I did. Apparently the blind side mirror detectors didn't work because the body shop failed to put butyl tape over the rear sensors. The butyl tape serves to cover radiowave signals which prevents false readings that a vehicle is present in your blind spot. Apparently, there is some bulletin covering this (dealer printed and showed it to me), but I was told that this wasn't covered under warranty because I was involved in an accident. The dealer (Penske Chevy in Cerritos) ended up charging me almost $500.00 to install the butyl tape. The service advisor told me the process was quite involved, which seemed pretty iffy to me to install a piece of tape. Nonetheless, I paid what they asked for since insurance reimbursed me for it anyway. Has anyone else had to pay for butyl tape installation after an accident, and if so, how much did your dealer charge you?