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Transmission control module fault
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JL
 


Member Since: 02 Jun 2015
Location: West coast
Posts: 50

Norway 2012 Discovery 4 3.0 SDV6 HSE Lux Auto Unknown ColourDiscovery 4
Transmission control module fault

2012 D4 157000km
While driving transmission suddenly did what seems like a very harsh gearghange ( harsh like older auto gearboxes did in "kickdown") . The whole christmastree lit up and multiple faults occured.
Car was drivable but D would flash on the selector switch and gearbox fault was coming up . Drove of the road ar first chance and ofcourse car would not move from there after I stopped it. It starts and everything is fine until I try to select gear . Wheel would jump back to park and all faults flash in the dash.

Did try the usual start/stop , disconect battery and brake switch without any luck . Screenshot of the fault codes from Iidtool .


I had to get the car rescued to nearest garage and get a rental . But I'm not sure if they are familiar with land rovers at all so better do some research . So any pointers ? Is the control module toast ?


Thanks
Jan
  
Post #20428073rd Apr 2019 3:25 pm
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grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6265

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

most worrying should be p0966-12 which according to manual if cleared and still shows up requires TCm replacement
g
  
Post #20428243rd Apr 2019 4:43 pm
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grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6265

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

also 850-64 might be pointing to comms issues between tcm and rest of system
loose connection somwhere?
good luck recovering it
g
  
Post #20428253rd Apr 2019 4:56 pm
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JL
 


Member Since: 02 Jun 2015
Location: West coast
Posts: 50

Norway 2012 Discovery 4 3.0 SDV6 HSE Lux Auto Unknown ColourDiscovery 4

I was kind of hoping someone would find some better news. . Any reason why the TCM should fail ? Is this the one behind the battery ?
  
Post #20428593rd Apr 2019 7:26 pm
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Discomadness
 


Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256

Wales 2007 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

If it’s the same as a D3 water ingress would be the culprit. Bonnet seal shrinks, opens a gap on the back corner and allows water to drip onto the tccm plugs. Kills the pcb inside.
 Jarrod

Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE. 
 
Post #20428923rd Apr 2019 9:03 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi

Could low oil cause this plse, or maybe needing an oil change ???

Or leaking oil going onto the gearbox connector

of course know ur far more knowledgeable, just always interested Bow down

Many thks as always
   
Post #20429043rd Apr 2019 9:35 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Discomadness wrote:
If it’s the same as a D3 water ingress would be the culprit. Bonnet seal shrinks, opens a gap on the back corner and allows water to drip onto the tccm plugs. Kills the pcb inside.


Hi buddy

Seen a few of them on the forum where waters got in, turning the pins green Thumbs Up

Hope all is well
   
Post #20429063rd Apr 2019 9:40 pm
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Discomadness
 


Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256

Wales 2007 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Hiya Gary mate.

Yeah I bought a second hand one and it was showing signs of water damage also so ended up buying a brand new oem one. I’ve altered the seal on the bonnet now and intend to fit a bit of a cover over the plugs.

Ah so so to be honest. Bung you an email soon buddy

Hopefully things settling down next couple of weeks Thumbs Up

Hope all is good with you ?
 Jarrod

Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE. 
 
Post #20429273rd Apr 2019 10:51 pm
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JL
 


Member Since: 02 Jun 2015
Location: West coast
Posts: 50

Norway 2012 Discovery 4 3.0 SDV6 HSE Lux Auto Unknown ColourDiscovery 4

Check regularly but never seen sign og water in there but never knows.
As I'm flying of to work the car is noe in the hands of what is hopefully a good mechanic. But I must say I fear they would spend hours doing diagnostic and/or just start changing parts at a hefty cost .
  
Post #20429714th Apr 2019 6:32 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Discomadness wrote:
Hiya Gary mate.

Yeah I bought a second hand one and it was showing signs of water damage also so ended up buying a brand new oem one. I’ve altered the seal on the bonnet now and intend to fit a bit of a cover over the plugs.

Ah so so to be honest. Bung you an email soon buddy

Hopefully things settling down next couple of weeks Thumbs Up

Hope all is good with you ?


Hiya

Climbing the wall still, roll on summer so can at least sit in the garden

Hope ur disco is now all resolved and seeing the light at the end of the tunnel

Will keep an eye out for the email buddy

Interesting how well we get to know our motors and it’s traits Laughing

Have a good one Thumbs Up
   
Post #20429984th Apr 2019 7:55 am
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JL
 


Member Since: 02 Jun 2015
Location: West coast
Posts: 50

Norway 2012 Discovery 4 3.0 SDV6 HSE Lux Auto Unknown ColourDiscovery 4

First garage gave up so now it is next to someone else. It was mentioned that it could be the solenoid and this means open up the gearbox
  
Post #20434305th Apr 2019 11:06 am
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grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6265

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

I would still checked all the bits mentioned on here in person to eliminate obious and typical issues

if nothign found ...

G
  
Post #20434425th Apr 2019 11:41 am
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JL
 


Member Since: 02 Jun 2015
Location: West coast
Posts: 50

Norway 2012 Discovery 4 3.0 SDV6 HSE Lux Auto Unknown ColourDiscovery 4

Me and my car is now 1200kms apart so I have to rely on a garage to fix it. Hopefully I can give them some pointers.
  
Post #20435455th Apr 2019 7:49 pm
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JL
 


Member Since: 02 Jun 2015
Location: West coast
Posts: 50

Norway 2012 Discovery 4 3.0 SDV6 HSE Lux Auto Unknown ColourDiscovery 4

So it seems like the solenoid valve needs replacement at a cost of around 4400£ .. New gearbox 11500£. I blacked out a little while
  
Post #20446009th Apr 2019 6:25 pm
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grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6265

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

wtf? Shocked
  
Post #204469910th Apr 2019 5:45 am
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