My 06 LR3 just started throwing codes and warnings for the HDC system, parking brake, and transmission. No CEL. Runs as it should, but the suspension will lower. If I shut it down and restart, the warnings clear and suspension cycles normally, but after a few miles they do re-appear and it'll lower again.

Read just about every post on the internet regarding this last night, and most people seem to have these faults appear immediately upon startup. Any recommendations as to what to test with my symptoms? Trying to narrow down where this electrical gremlin might be hiding...

 

First issue can be rear brake lamps or brake switch itself.

Other issue can be a bit more complex, like rear locking diff actuator (if equip) or transfer pox clutch solenoid.

Really need codes to narrow it all down, but I would check the rear brake lamps first.