Called Jaguar about wiring harness recall and was told it does not apply to my car but here is what happen then.
My FE's small battery was replaced 11 months ago but it went bad again about 2 weeks ago (measure at 5.4v then and now at 2.8v). After sitting more than 10 days at the local dealer's parking lot without a loaner, I was told that the wiring harness was the root of the problem and it is a 12 hours job to replace it according to Jaguar. Hower, my local dearler cannot do it as it requires two techs to do that and they have only one. Luckly, I have kept another appointment made two weeks at another dearler 85 miles away on Feb. 1 (with a loaner). The problem is that Jaguar won't cover towing from dearler to dearler (will cost more than $600). Told it would be ok if I get the car to, say, home then tow. I had over 100 miles when dropped at the local dealer but was down to 17 miles yeaterday just sitting there (not normal). The local derlar was able to jump and move the car close to one of their level 2 chargers. After an overnoght changing, it was at 100%, 82.5kwh, and 242 miles. The dealer told me I should be able to drive it to home. Have to jump it and back out the parking lot. Then heard some noise when applying the break and car won't move any more (can change gears). Dealer helped to push the car to a gas station next door. Called Jaguar roadside service again and this time the towing was arranged and the car is now at the other dealer after 5 hours. Now the waiting starts but at least I will have a loaner by Feb1 if needed.
Long story short, if your 12v batteries did not last as you think they should (I saw a few of you had them replaced more than once in the past year), you may want to see if this wiring harness could be a problem. If it happens after the warrnaty, that could be a serious problem (if Jaguar does not issue a gerenal recall).