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DISCO3.CO.UK > Technical (D4)

Gear shift module not rising. No led indicator. PLEASE HELP!
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

Got a wiring diagram. Am I right in thinking Fuse 30E 10amps in the engine compartment is in charge of this module?

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Post #23903493rd Apr 2025 3:48 pm
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

Checked fuse 30 - multimeter read 12v.
Checked for power to gear shift connector. Multimeter read 12v battery cable and 12v ignition cable.

So why does my gear shift module not rise up? It rises up with a direct 9v battery and also the solenoid works with a direct 9v battery.

What do you guys think is the problem?  
Post #23903884th Apr 2025 12:21 pm
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

Do you know what is the purpose of the resistors? Just ordered some. my next try.

jackvoyager wrote:
I had a similar problem with the selector, I fixed it... read here :
https://www.disco3.co.uk/forum/gear-select...93557.html
maybe you have something similar.



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Last edited by discofever16 on 5th Apr 2025 3:54 pm. Edited 1 time in total 
Post #23904615th Apr 2025 3:36 pm
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

Did you only resolder the x2 1ohm resistors? or all the other components?  
Post #23904625th Apr 2025 3:54 pm
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jackvoyager
 


Member Since: 02 Oct 2020
Location: UK
Posts: 63

United Kingdom 2012 Discovery 4 3.0 TDV6 HSE Auto Bonatti GreyDiscovery 4

only 2  
Post #23906998th Apr 2025 3:42 pm
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

Just waiting for the resistors to be delivered. Will let you know how it goes.  
Post #23907328th Apr 2025 9:56 pm
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

Soldered x2 1ohms resistors as you suggested. made no difference. nothing lights up, nothing raises, nothing changes. gearbox fault light on dash.
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Post #239125317th Apr 2025 12:08 pm
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jonno1
 


Member Since: 16 Jun 2010
Location: SW London
Posts: 736

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Santorini BlackDiscovery 4

I believe that it is the transistor (circled) that needs replacing for illumination and green ring.
It is a seriously tiny thing though.

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Post #239126717th Apr 2025 2:39 pm
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Gareth
Site Moderator 


Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26805

United Kingdom 

You could possibly have a look at this chap. He fixed my sealed for life headlamp on my Defender which saved me a fortune!

It’s a bit back street, but he says he does loads of these repairs.

http://kgautoelectronics.com/  
Post #239131118th Apr 2025 7:03 am
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

I've seen you can buy a new unit non genuine for £140. Does anyone know if it needs programming?  
Post #239134918th Apr 2025 9:29 pm
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jackvoyager
 


Member Since: 02 Oct 2020
Location: UK
Posts: 63

United Kingdom 2012 Discovery 4 3.0 TDV6 HSE Auto Bonatti GreyDiscovery 4

It seems that you have some other problem ...
Maybe it's not the selector but something else ...  
Post #239136519th Apr 2025 6:19 am
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

these are the fault codes. any ideas?

P0850-64 P/N switch input circuit
U0402-00 Invalid data sent from Transmission Control Module (TCM)
U0404-68 Invalid data sent from Transmission Control Module
U0103-00 Lost communication with gear shift module (GSM)

U101B-87 Lost communication with gear shift module (GSM) - multiple bus
b1087-88 LIN bus A
U0103-63 Lost communication with gear shift module (GSM)

U0103-00 Lost communication with gear shift module  
Post #239137019th Apr 2025 8:13 am
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discofever16
 


Member Since: 14 Feb 2024
Location: yorkshire
Posts: 36

United Kingdom 

Just in case anyone wanted an update. I purchase a new Chinese GSM online for under £200. It came preprogrammed so plug and play. Fitted it in 15 minutes. Back up and running as it should.  
Post #239416214th Jun 2025 10:48 am
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AustinJMJ
 


Member Since: 21 Nov 2024
Location: Leicestershire
Posts: 173

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Santorini BlackDiscovery 4

-snip-.. wrong thread! Embarassed All the best,
Austin  
Post #239425216th Jun 2025 11:40 am
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Frapp
 


Member Since: 19 Dec 2008
Location: Norff Zummerzet
Posts: 1656

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Indus SilverDiscovery 4

Gareth wrote:
You could possibly have a look at this chap. He fixed my sealed for life headlamp on my Defender which saved me a fortune!

It’s a bit back street, but he says he does loads of these repairs.

http://kgautoelectronics.com/


I have just had my spare repaired by him, super quick service Member of the carrot crank club

Embarrassingly in for the 2nd round, bought another two

D3 Jack Russell carrier
D4 Landmark for towing duties  
Post #23953234th Jul 2025 9:18 am
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