Hi Guys,
Came out of work tonight and fired up the beast. Temp was reading -0.5C but as i went through the key positions the dreaded display pinged up "HDC Inactive" & "Air suspension inactive" . Reversed out the space and turned the car off, though i would have to do "lock to lock" to clear the air suspension as I still had the light on the hight display. As i turned the key back to start again i had no faults and she drove home fine.
Over the past few month i have every now and again had the HDC fault but its only just pinged up then cleared straight away.
Any ideas what could be the cause? Was she just off being left in the cold all day and had a mood swing or could there be something more to it?
Thanks in advance
Rob

Good luck, seems to be the "Holy Grail" of RR questions............

Not what i wanted to hear.

How old is your battery? The first thing to "ping" if the charge drops is "HDC Inactive". Mine does it if it has been left for a week and did it routinely before I changed the (five year old) battery. 2012 4.4 TDV8 Westminster
2007 3.6 TDV8 Vogue - gone!
2003 V8 HSE (LPG) - gone!
2018 F-Pace 25t Portfolio
1974 LR Series III Lightweight FFR
2014 BMW 640i Gran Coupe

No idea how old the battery is. Got the car in June and haven't had a problem with it. Looks quite new but that doesn't mean much.

Just put new battery (That I charged for 24 hours on mine) still HDC inactive/ Air Susp........

(Yes I did steer lock to lock after re-attaching battery)

have you had any faults read? Might need a reset then be ok.

EAS Kicker on route to my door now

a bit more info here;

http://rangerovers.net/repairdetails/airsu...aults.html 2004 black Vogue TD6

Found this-
http://forum.landrovernet.com/showthread.p...-TD6/page2

Taken from above thread-
"HDC Inactive" Message - Fault Found

Took Range to Stealer this morning and I have to say I was impressed. Very helpful and honest.

Plugged Range upto computer and found No Codes stored in any of the ECU's.

They explained that the reason why the "HDC Inactive" Messages Displays.

Technical Service Bulletin No. LM206-002, 04 January 2005

Subject/Concern: Range Rover (LM) - HDC Inactive Message after Engine Start in Low Temperatures.

Models: Range Rover (LM) 2002 - 2006 Engine: TD6

Markets: All

Section: 206-09

Section: Brakes

Summary: In low ambient temperatures the "HDC INACTIVE" message may be displayed during and/or shortly after cranking the engine.

NOTE: HDC functionality is NOT effected, this is a message display error only.

Cause: Low batter voltage during engine cranking triggers the message display.

Action: Should a customer express concern regarding the above, refer to the Service Instruction detailed in this Bulletin in order to replace the anti-lock braking (ABS) electronic control unit (ECU)

Richcl wrote:

Found this-
http://forum.landrovernet.com/showthread.p...-TD6/page2

Taken from above thread-
"HDC Inactive" Message - Fault Found

Took Range to Stealer this morning and I have to say I was impressed. Very helpful and honest.

Plugged Range upto computer and found No Codes stored in any of the ECU's.

They explained that the reason why the "HDC Inactive" Messages Displays.

Technical Service Bulletin No. LM206-002, 04 January 2005

Subject/Concern: Range Rover (LM) - HDC Inactive Message after Engine Start in Low Temperatures.

Models: Range Rover (LM) 2002 - 2006 Engine: TD6

Markets: All

Section: 206-09

Section: Brakes

Summary: In low ambient temperatures the "HDC INACTIVE" message may be displayed during and/or shortly after cranking the engine.

NOTE: HDC functionality is NOT effected, this is a message display error only.

Cause: Low batter voltage during engine cranking triggers the message display.

Action: Should a customer express concern regarding the above, refer to the Service Instruction detailed in this Bulletin in order to replace the anti-lock braking (ABS) electronic control unit (ECU)

So what is it then landrover? low ambient temperature, low battery voltage or ABS ECU....  2004 black Vogue TD6

Your guess is as good as mine, could be all of the above!...........

all the above at random maybe ?

...I have the trans prog error....on cold mornings, at random it seems ....sometimes just shift into neutral and back to park and it goes away ...got to be a bit of damp a in dodgy sensor somewhere I reckon

/typical British car I guess, used to be called "character" whereas nowadays its software bugs LOL  cheers
bogie

If starting the car in cold weather does cause a drain on the battery voltage, therefore triggering the lights/warnings etc, I'm going to attach a battery pack to the car when I start it tomorrow, hopefully boosting the charge enough to not trigger the warnings. Will see what happens....



(Would have liked this sorted, as i'm doing a 700 mile round trip next week to Scotland, would rather not have these warning lights on.) Well I suppose the battery will get a good charge!

Richcl wrote:

If starting the car in cold weather does cause a drain on the battery voltage, therefore triggering the lights/warnings etc, I'm going to attach a battery pack to the car when I start it tomorrow, hopefully boosting the charge enough to not trigger the warnings. Will see what happens....



(Would have liked this sorted, as i'm doing a 700 mile round trip next week to Scotland, would rather not have these warning lights on.) Well I suppose the battery will get a good charge!