I have 2 landrover discovery 3 and they are both being problematic at the moment

landrover 1 is a 2007 tdv6 gs automatic
starts up fine and drives but as soon as I drive uphill I get many warnings on the dash
HDC fault system not available
engine malfunction
special programs not available
transmission fault gears not available
park break fault
suspension lowered
the car then goes into limp mode im able to crawl to the top of the hill turn it off and then start it back up and it drives no problem till I hit another hill I have changed the battery as advised by a garage but this made no difference.

landrover 2 is a 2006 tdv6 s manual
most of the time this one won't even start as soon as I put the key in without even turning it I get the same faults listed above except the lowered suspension one as iv removed the air suspension and put it on coils this was done months before this problem started also the hazards lights come on I was advised to changed the glow plugs this made no difference when it does start it drives fine.

 

How is the battery in each one?

 

iv put a brand new one in the auto today and the other had a new one few months ago

 

Well, if you are going to be a 2x LR3 owner, I highly suggest a quality diagnostic tool like the IIDTool from GAP Diagnostics. You could read the codes and be three steps ahead of where you are right now. Otherwise we are flying blind....also, we don't have the TDV6 here in 'merica, so we may be less useful than a forum over in the UK. Best of luck!

 

You need codes read from a LR specific code reader, on the TDV6 the main issues for limp mode/multiple errors are battery voltage and worse case high pressure fuel pump issues but also look for split intercooler hoses and intercooler itself, egr valves - get any smoke clouds on acceleration ?
Without error codes we are just p*ssing in the wind, check out disco3 or AULRO forums for diesel engine specific issues.

 

a friend plugged it in for me and I have error code U2023

 

That is only a communication code ,you'll need a hard fault code to be of any help but i suspect a better reader would give you a P02290 code for low injector pressure.
This means an issue in the fuel delivery system and likely to be a failing HPFP, i would start with a new fuel filter and put some injector cleaner in the tank and see if it helps.

 

What he said... ^^^