If you got the letter, you really ought to make the trip to the dealer. The fix is not intended to impact your hybrid operation one way or the other UNLESS your vehicle is one that has the wiring / alternator issue. In that case, your overall satisfaction with the vehicle should improve. To over-simplify, the wiring harness can intermittently mis-communicate with the alternator. The alternator says "I don't know what you're trying to tell me to do, so I won't do anything". That includes charging the batteries. The fix is a more robust harness to alternator interaction via the replacement harness. Again, I am over-simplifying, but hopefully now you get the gist.

Peace,

Martin

I am NOT the official voice of GM with respect to Hybrid issues

I am NOT the official voice of GM with respect to Hybrid issues

I am NOT the official voice of GM with respect to Hybrid issues