How to disable start-stop
Senior Member
Joined: Oct 2022
Posts: 179
Likes: 35
From: Malvern, Chester County, PA USA
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.
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.
Last edited by Paldi; Sep 30, 2024 at 12:33 PM.
Senior Member
Joined: Oct 2022
Posts: 179
Likes: 35
From: Malvern, Chester County, PA USA
I think I'll try hooking my relay up to the small wire bundle from the capacitor. That way I can set the ECO default to "off" and turn it on when desired. I just need to get the wiring diagram from Ken.
Senior Member
Joined: Jan 2018
Posts: 296
Likes: 83
From: Maryland
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". 
Veteran Member
Joined: Jan 2012
Posts: 1,877
Likes: 413
From: Houston
Looking at their website, the barely support any cars, so no surprise the won't spend time adding a low volume vehicle.
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