I had a car once that relied on the bank sending it a "payment was made" message to the car every two weeks. To say it was not reliable was an understatement. For a good two weeks after the original purchase, I could not rely on the car due to faults with their system working in an area with spotty cell coverage (which still exist even in the US).

To the last day of my obligation to that lender, I would have problems with it, typically due to weather, problems with the module itself, or any number of other factors.

I would hope that Renaults system is better than that... but I will be hard pressed to trust such a system ever again. Having your car shut down remotely due to faulty DRM really sucks.