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Home > Maintenance & Mods (L322) > Now that's a first.. adaptive cruise control Red Restriction

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ergobyte

Member Since: 03 Apr 2022
Location: bordeaux
Posts: 124

2012 Range Rover Vogue 4.4 V8 Java Black

Now that's a first.. adaptive cruise control Red Restriction

So this just happened to me on MY2012 4.4TDV8.
cruising at 50mph on highway around Bordeaux (expecting to regenerate my DPF), I'm using my adaptive cruise control.

there is a sudden traffic stop and I have to brake quite urgently --> immediate red performance restriction alarm !

I exit the highway and park in a quiet parking, plug the IID tool : here 's what I have

Click image to enlarge

Nothing in there relevant to my actual mileage (17950) or today's date (feb 22nd)...

While I'm parked I close the car and proceed to make some purchases at the grocery store (whose parking I'm using)
20mn later I get in the car, put igniton on and the Red Trinagle of Doom has disapeared...

I'm at a loss here

There might be a hint with the fault "invalid data received from speed control module" on jan 15th. is it linked to adaptive cruise conrol ?

Thoughts anyone ? "it needs some intelligence to undestand you may not have enough"

22nd Feb 2023 4:20pm

JayGee

Member Since: 27 Jul 2021
Location: London
Posts: 3241

2012 Range Rover Vogue 4.4 V8 Orkney Grey

Most if not all those faults are 'spurious' i.e always thrown up on every fault scan and don't relate to actual issues. 2012 TDV8 Vogue (L322)

22nd Feb 2023 7:29pm

Baltic Blue

Member Since: 13 Aug 2015
Location: North Wales
Posts: 3774

2011 Range Rover Vogue SE TDV8 Baltic Blue

Hi ergo,
Just a thought, are you sure it wasn’t a forward alert warning ?
They can be quite “alarming” when they are activated.
Cheers
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

22nd Feb 2023 8:39pm

ergobyte

Member Since: 03 Apr 2022
Location: bordeaux
Posts: 124

Hi Mike,

I don't think so.
It was the "restricted performance" red triangle of doom all right ! No further explanations.

Having had the same for my faulty EGR (before I changed it), I've seen it before

The fact that it left no trace in the IID tool AND that it disapeared all by itself is puzzling
Apparently it's a first allright...

Cheers
Ergo "it needs some intelligence to undestand you may not have enough"

23rd Feb 2023 7:36am

GraemeS

Member Since: 06 Mar 2015
Location: Wagga area
Posts: 2486

2012 Range Rover Autobiography TDV8 Bournville

Re: Now that's a first.. adaptive cruise control Red Restric

ergobyte wrote:
"invalid data received from speed control module" on jan 15th. is it linked to adaptive cruise conrol ?

That speed control module is the adaptive cruise radar unit.

If your PCM isn't at the latest level then I suggest that you update it as there were changes regarding ACC quite late in the production run. My April 2012 build didn't get the PCM version that had already been released a couple of months earlier.

23rd Feb 2023 7:39am

ergobyte

Member Since: 03 Apr 2022
Location: bordeaux
Posts: 124

Yeah thanks GraemeS,

I had my suspicions, given the circumstances: adaptive CC on, brutal braking inducing abrupt release of CC, all of that leading to a "faulty sense of inadequacy" of my poor "speed control module"
I could test this theory...
I don't know if I want to make it happen again though

Cheers Mate "it needs some intelligence to undestand you may not have enough"

23rd Feb 2023 7:48am

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