Hello,
Long time lurker, first time poster.
I think I have exhausted my search with no real solution for my problem. My wife's 08 v6 LR2 has had the intermittent cold starting issues with HDC faults and this past summer I replaced the battery which seemed fix the issues until recently. She reported a few weeks ago after highway driving that the car hesitated to start but would eventually turn over with no fault codes or error messages. 2 weeks ago she went out to start the car after a significant rainstorm and reported it crank briefly and then nothing. She drove off in my LR3 while I was left to ponder the situation. I plugged my Blue Driver into the OBD2 port with nothing unusual to report. Lights, radio, instruments all appeared to light up and work. However when I went to turn the car over, nothing. No clicking of the starter, just a subtle click from the gear shifter. We then left for vacation for a week and returned yesterday. I figured if anything got wet it would be dry now and maybe start but no luck. I even tried to charge the battery for a few hours and even disconnected the negative terminal for a minute with no change in the results. The battery is reading 11.8 v when taken at the terminals and 12.8 volts when taken through the OBD2 port device.
I get no error codes or faults and for the first time a bit stumped. This car has been a real easy ownership since new. 72K and regular maintenance only required until now. I had it towed to the dealer for further inspection and a software update ( it has not sen the dealer in 7 years). Anyways I would be happy to hear any of your thoughts and will report back once I have the issue fixed.

Looks like a failed starter. I had it replaced $750 as well as 2 new FOBs. Hopefully this will do the trick and is not the beginning of the dreading battery drain debacle.
Cheers!

IF it is the Denso starter you can repair the solenoid, far cheaper than new starter. it does sound like the starter is at fault.