same thing happened to my 500i and what it turned out to be is for some weird reason i had to pull the handbrake in harder so try that before you pay the 50 dollars cause i actually brought mine to the shop not knowing and he said i had to just pull hard on the brake and it worked fine after knowing that

 

My dealer told me on the AC 500 that the start in gear was a simple link to the brake light instead of some complex mechanism.

I asked this before purchase, I like to know these things.

Make sure the tail light is coming on with your handbrake...

Good luck.

-JC

 

our 2002 cat 300 4x4 did the same . we checked 2 see if the rear brake lit up when we applied the hand brake. we noticed that the rear light was staying on after the hand brake was released .what we did was we sprayed some lubricant around the master cylinder where the hand brake hits the plunger to activate the brake ,the plunger was sticking and now its free and our start in gear works again. good luck .

 

Thanks for the responces guys, just got back from using the ATV all weekend and the start in gear worked everytime. I did mess with some wires and whatever before the weekend so maybe it was just something small. I will look more into it if it happens again.

Again, thanks for all your responces!