I think a few questions have to be answered so you get the best advise. When I 1st read the start of this thread...engine quit, left me on the side of the road. I took that to mean "no crank" which lead me to believe RCM...but after I answered here comes the CPS advise...which means it must be cranking "no start".... Give us all the details when you are having problems... Like it quits and goes to limp mode.... RCM, CPS, problems will not put you into limp mode. CPS will give you signs with hard starts, rough idles, and quit all together, but will allow you to crank the motor. RCM symtoms are it will quit, and not crank over. Let it set for awhile, and it will start and run for awhile until hot again. Eventually, it will never start.... Limp mode, could be a throttle sensor problem....could be some other things... but my point is, give us all the symptoms....it will be easier for us all to sort out, rather than me or any others giving bad advise...