Both the windshield and emblem should be checked and cleaned. I really do not understand what the service people are doing here? Of course this is the inter web So grains of salt needed.
I have a brand new 2017 CX-5 Grand Touring with stop and go cruise control. About 50% of the time I use the cruise control, I get this message: "Mazda Radar Cruise Control Disabled under 20 mph". The radar faceplate and the camera are both clean (I get a different message when they are obstructed). The dealership has checked the computer and found no errors or faults. There doesn't seem to be a pattern as to when it's disabled and when it's not, so I'm having trouble diagnosing.
The manual (page 4-126) says this message displays when there is an issue with the forward sensing camera, an issue with the stop hold control function, or the electric parking break.
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Hey man I think I found out why it does that. Well here is what solved exactly my problem.
My 2018 CX5 never said that till after I also got the remote start installed at dealer, but like yours it wasn’t factory Remote start. So yesterday I noticed that if I turn on the remote start get in car , drive off and then put seat belt I will get message.
But if I put my seat belt on, turn on car via push start, and drive off I don’t get the under 20mph disabled ...
That’s what solved my prob. Try it , I’m guessing it has something to do with the remote start or the installation process.
PS. I am also from Midwest. So it maybe the way they install it here.