I've had the dreaded serv 4wd and it went from 4wd into 2wd and got stuck in sand. I took it to the dealer and they did a software update for ABS module. They found a stored code C006A-62 multi axis speed sensor signal comparative failure. Should I ask for this update to be done? I have been back to the beach, but had it in 4 low just in case, would like to just use the proper sand/mud mode if I can. Thanks!