"Transmission Fault" Explained
I happened by a LR dealer in another state yesterday and asked the service manager to look at a minor problem ("fuel tank cap loose or missing" message). While they had the truck I asked him about the "Transmission Fault, Traction Reduced" message that I get pretty regularly after not driving my truck for a week or so.
His response was that the LR3 "wakes up" several times a day to look around. Each time it does this it uses some battery power. After some period of time (days or weeks depending on a bunch of factors) the voltage gets too low for the initial boot handshake between the various compters to go properly and you get the first fault in the list ("Transmission Fault, ..."). It has nothing to do with the transmisison.
I had noticed that I get the message when the truck has sat for a while. Then every day after that for a few days I get the message the first time I start it in a day. For the first few days it comes up right after the boot finishes, later it comes up after cranking the engine, finally it goes away. I was thinking it was some sort of transmisison fluid thing, but it is a battery voltage thing--the more you drive it the higher the voltage and the less frequent the fault happens.
He recommended leaving it on a trickle charger when you're not driving it for several days. The logistics seem tough, but I'm thinking maybe I can have a Cannon Plug installed in the grill so I can plug a trickle charger in without having to leave the hood up.
2005 LR3, New Mexico