Originally Posted by Freddy J

The challenge you suggest was my thinking when I posted that stop/start inhibit list. It seemed apparent to me that the list came from the Land Rover side of JLR with that trailer inhibit. It looked like an attractive entry point to fool the system but not having any assurance that the XJ had a trailer output even considered in its design left me on the cautious side and I sure didn't want to mess up a perfectly functioning system with any experimenting i.e. unintended consequences. So, I put up with the no stop start warning light resulting from the disconnected ground lead.
Another thought and direction: There is a guy, Steve Klonsky, who has been making and selling devices that plug into the SDD port for GM and Chrysler vehicles that disables the stop/start feature. (Smart Stop Start - HOME) I've tried to get his attention to focus on developing a device for us Jaguar customers since 2018. He has replied to me that he might consider it for the future. Maybe more of us could encourage him to develop a fix. I'm sure his market and customer base size isn't with us guys, though.

Originally Posted by robertfyfe

2016 XJL. The only negative I can see when unplugging small wire bundle from the trunk mounted capacitor is there is no beep when locking the car.

Originally Posted by Freddy J

FYI, no joy. Steve Klonsky replied to my current inquiry whether his company, smartstopstart.com, will be doing anything for us x351 JLR owners is "Sorry, we decided not to support this vehicle".