I believe I recently experienced a similar problem with my 2019 Defender HD-8. I had it's first service two months ago, from the dealership, and with less than 75 miles since then, it suddenly decelerated, started to run rough and the check engine light came on. I was less than a 1/4 mile from home and turned it off and waited a few minutes to restart it. I made it back to the house but check engine light came back on so I parked it.
I don't run it hard, I have a 38 acre farm and use it mainly for hauling and just cruising around. I have checked the battery connections and all the fluid levels look fine. Let me know if anyone has had a similar experience or if there are any suggestions.
