Stop start supposedly use break regeneration.... although I'm curious also... I'm guessing it just wont  Freelander 2 TD4 Auto, SE, Narvik Black, Alpaca full leather, Rear Headrest Entertainment System, 6 CD, 18 HSE Wheels, Privicy tints

Stop start shuts off when the temperature drops to 4°C. Turn it off myself when doing short trips and trying to get the car warmed up.

In my mind the hdc or reduced traction fault occurs when you start a cold car because the oil supply to the haldex is a little slow at building up pressure when cold, the electrics then notice this initial low pressure and give a warning.

tractors do the same, chucking up mixed warnings upon cold starts At work
At home

"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

Mine has always (often) done that during winter/cold weather startups. Freely is now 3-years old and just started her 4th winter, so therfore this is not a problem or fault, it is as previously mentioned a normal message (warning if you like) when cold starting.

Looks like some people are getting paranoid and looking for faults that are not there  2007 Freelander 2 HSE TD4 Manual with Premium Pack & Moonroof.
Stornoway Grey with Ebony Black Pleather, Clear Indicators, Body Side Mouldings etc.

Nah - I'm not worried - although I do drive a LR so there is a bit of paranoia there  Freelander 2 TD4 Auto, SE, Narvik Black, Alpaca full leather, Rear Headrest Entertainment System, 6 CD, 18 HSE Wheels, Privicy tints

AndyC wrote:

Mine has always (often) done that during winter/cold weather startups. Freely is now 3-years old and just started her 4th winter, so therfore this is not a problem or fault, it is as previously mentioned a normal message (warning if you like) when cold starting.

Looks like some people are getting paranoid and looking for faults that are not there

Mine does this, it says there is a fault but will switch the HDC on andvit works,

Yes it does show the message BUT it shouldn't if there isn't a fault

I think CG explanation is plausible  Former Mod/Member, with the most post & Chicken George Arch nemesis

npinks wrote:

I think CG is fantastic

 At work
At home

"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

npinks wrote:

I think CG is paranoid

 2007 Freelander 2 HSE TD4 Manual with Premium Pack & Moonroof.
Stornoway Grey with Ebony Black Pleather, Clear Indicators, Body Side Mouldings etc.

This morning on starting the car I had the HDC fault warning, but wasn't worried has I had read the previous posts, as well as the warning there was no volume on the radio !

I dropped the wife off about 2 mile away stopped the car & re-started it, no fault warning and the volume back, I think the silence was better, it was that bloody annoying Graham Norton on the radio. What if there were no hypothetical situations?

I am bringing back this topic because I've found out which is the reason for the "HDC Not Available" warning message.
I've had the chance to play a little with the ABS controller and found out that this message is shown on the Instrument Cluster when the supply voltage is below a specific threshold.
Then all fell into place...

Let's think a little.
1.
We all know that HDC is working by selectively braking individual wheels in order to keep a certain speed.
All this is done by the help of the ABS system.
The pressure needed for the brakes to function is generated by the ABS system pump.
And guess what... The ABS motor pump is electrical.
So, below a specific battery voltage, the system is taking the decision that it isn't safe for HDC to be available, because of the pump inefficiency to create a specific system/brake pressure.
2.
At low ambient temperatures, the electrical load on the battery is considerable because of the glow plugs' activation.
Also, at low temperatures the performance of the lead batteries is much lower.
These will lead to a way to low system voltage, just before and during cranking.

The above combined will give us the "HDC Not Available" message.

But the system will work OK as soon the system voltage will reach nominal values once the engine is started and the generator will do its job.

So, it isn't the Haldex and its oil the ones responsible for this message. The ABS system is...
In fact the Haldex has nothing to do with HDC. The Haldex is almost deactivated when braking and ABS is active...

Last edited by alex_pescaru on 24th Jan 2011 12:15 am. Edited 1 time in total

Makes perfect sense to me. Thank you for making the connection.  We Don't Care About Pot Holes !!

Thanks Alex.

Saves me a trip to the stealers

Hi i`m hoping someone might be able to advise me i had my freelander 2 into dealers for q106 and the message HDC FAULT system not available but they said they couldn`t find any fault stored it came on again at weekend so i rang dealers again and i was told it has to go in for two days on the 23/2/11 just glad its under warranty

nick f wrote:

Hi i`m hoping someone might be able to advise me i had my freelander 2 into dealers for q106 and the message HDC FAULT system not available but they said they couldn`t find any fault stored it came on again at weekend so i rang dealers again and i was told it has to go in for two days on the 23/2/11 just glad its under warranty