I did the same thing with my key fob just after we purchased our 2016 Volt Premier in July 2016. When I took my pants out of the dryer I noticed something in the right front pocket. When I pulled out the key fob all I could see is my wife's non smiling face and my wallet with me shucking out several several large bills.
When I just checked to see if it worked, it did. I could not believe it, and never had any issues with the key nearly 2 years later....
If you've ever opened it to replace a battery, you'll see there's basically nothing in there but a chip and a board. I'm sure the chip is waterproof and the contacts on the board should be OK once dried out. That's probably why it survives a wash. Only thing I can think of that might cause it trouble are the microswitches getting corrosion if left in water too long.
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