Service advancement warning came on the main gauge display screen while I was driving 62 mph with cruise control set. Vehicle is a 2021 jayco greyhawk 31f class c motorhome on ford e450 chassis with 7.3L gas v-8 and 6-speed automatic transmission. Cruise control stopped working and would not come back on. Hill start assist disabled message came on after I hit "ok" for the service advancement warning. Vehicle became very difficult to control with moderate crosswind. It would sway side to side and moved all over in...
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the lane as I steered and countersteered. Vehicle power also seemed to decrease as it would only go about 52 mph in 5th gear and would downshift to 4th in order to go from 45 up to about 55. It was terrifying to go that fast when a gust of wind hit. We pulled into a truck stop, turned off motor and let it sit a couple minutes. It restarted easily but even stationary in park and in drive (stopped) the service advancement warning came back on and the cruise control would not power on. Shut motor off and disconnected negative battery cable for about 20 minutes, hooked battery up and vehicle started with no warning lights. Drove another 20ish miles with no issues, then turned on cruise control and set it at 55. After 2 minutes the c/c shut off again, service activator warning came on, vehicle hard to control with crosswind and decreased engine power. Pulled to shoulder, tried to restart and same issue as at truck stop. Disconnected battery again 20 minutes, hooked back up and drove with no issues for 6 hrs (and 1 fuel stop) with c/c remaining off. Next day issue repeated itself: c/c turned off after about 2 minutes, service advancement light etc. Disconnect battery 20 min, restart and drove without turning on c/c for 7 hrs (w/ 2 stops) no issues. Full power and advancement electronic stability control work fine when service advancement warning is not on.*Dt*jb*dt*dt*dt*jb*jb*jb*dt