Start button won't work

The same thing has been happening to me. Luckily it's still starting. Is there something we can do that doesn't cost a fortune?

These are keyless KESSI systems and the problems will be either the start button itself with poor contacts or something more complicated in how the button press is detected. V.W use KESSI button start on a number of their vehicles now, try searching for KESSI faults? The amount you pay to fix the fault near home relates to how important it is to start your car miles from home and the cost of towing, garage bills and a hotel stopover!

Here's one guess: Car manufacturers haven't learned much about switches and connectors they put into cars where humidity levels can be very high. The push start switch is probably sending a very low voltage and current signal to an electronic module. This low current is insufficient to keep switch contacts clean and they aren't gold plated. The other thing they do is put assembly grease inside switches to keep the plastic parts running smooth. Over time and with high temperatures, the grease leeches on to switch contacts which then make poor contact.

my 2015 is getting flakey, too...where can i spray contact cleaner?

The other thing they do is put assembly grease inside switches to keep the plastic parts running smooth. Over time and with high temperatures, the grease leeches on to switch contacts which then make poor contact.

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Spraying in contact cleaner can dilute and re-distribute their grease. Take it apart, clean, clean contacts, carefully re-grease and put it back together - or buy a new switch if it's important to you.

thanx

I assume it will be standard automotive contact switch taking very little current and without gold flashed contacts. If it's mounted horizonal or vertically that's the second problem, because a hot interior might cause their dielectric grease to run down inside the switch. For such a critical application starting a car, they should have designed it with an electronic Hall effect contactless push button switch.

Nice pics. Constructed as 4 conductive silicone pads making contact across the 4 plated grids. Very low current connected to logic. Looks like they all have to make contact at the same time? Make sure when the button is pressed, the pads are still long enough to touch the grids. I've met this type before. A membrane type switch is normally hermetically sealed against moisture and atmosphere, but this doesn't look like that. You've given it a new life but expect it may come back again? At least you haven't had to buy a new switch and I doubt the design would be any different.