Member Since: 02 Jun 2015
Location: West coast
Posts: 50
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
3rd Apr 2019 3:25 pm
grzesiul
Member Since: 11 May 2008
Location: UK
Posts: 6403
most worrying should be p0966-12 which according to manual if cleared and still shows up requires TCm replacement
g
3rd Apr 2019 4:43 pm
grzesiul
Member Since: 11 May 2008
Location: UK
Posts: 6403
also 850-64 might be pointing to comms issues between tcm and rest of system
loose connection somwhere?
good luck recovering it
g
3rd Apr 2019 4:56 pm
JL
Member Since: 02 Jun 2015
Location: West coast
Posts: 50
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 ?
3rd Apr 2019 7:26 pm
Discomadness
Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256
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.
3rd Apr 2019 9:03 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14136
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
Many thks as always
3rd Apr 2019 9:35 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14136
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
Hope all is well
3rd Apr 2019 9:40 pm
Discomadness
Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256
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
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.
3rd Apr 2019 10:51 pm
JL
Member Since: 02 Jun 2015
Location: West coast
Posts: 50
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 .
4th Apr 2019 6:32 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14136
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
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
Have a good one
4th Apr 2019 7:55 am
JL
Member Since: 02 Jun 2015
Location: West coast
Posts: 50
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
5th Apr 2019 11:06 am
grzesiul
Member Since: 11 May 2008
Location: UK
Posts: 6403
I would still checked all the bits mentioned on here in person to eliminate obious and typical issues
if nothign found ...
G
5th Apr 2019 11:41 am
JL
Member Since: 02 Jun 2015
Location: West coast
Posts: 50
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.
5th Apr 2019 7:49 pm
JL
Member Since: 02 Jun 2015
Location: West coast
Posts: 50
So it seems like the solenoid valve needs replacement at a cost of around 4400£ .. New gearbox 11500£. I blacked out a little while
9th Apr 2019 6:25 pm
grzesiul
Member Since: 11 May 2008
Location: UK
Posts: 6403
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