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Gearbox Issues - Stuck in Park - SORTED
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Trailered Movements
 


Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1198

United Kingdom 2011 Discovery 4 3.0 SDV6 Commercial Auto Sumatra BlackDiscovery 4
Gearbox Issues - Stuck in Park - SORTED

D4 with the 6 speed auto, everything working normally until; Gearbox fault on dash, thumps when putting in D or R, put it in P and switched it off.

Wouldn't start and dash said it was not in P, but you couldn't move the gear lever.

Had just about every electrical circuit fault codes, nearly all due to 'loss of signal'.

Changed the brake switch and all problems go away.

The next day, put it in P again, Gearbox fault on dash, but able to put it in D or R, but thumped in.

Eventually had to put it in P, and then although it would stop and start OK, couldn't get it out of P.

Cleared the many faults, and it all went back to normal again, and for the last 2 days, not an issue.

Battery is a one month old VARTA AGM, 12.2v engine off but vehicle going through its checks, and 14.3v with engine on tickover just after starting.

As the problem appears to go away with simple fault clearing, it would appear to be an electrical fault rather than mechanical.

Any ideas of where to look please, and also, this only manifests itself when going into park, but could problems arise whilst travelling?

Many thanks in advance.


Dave
 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago) 


Last edited by Trailered Movements on 26th Apr 2022 4:40 pm. Edited 1 time in total 
Post #22861632nd Apr 2022 11:15 am
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TigerRecovery
 


Member Since: 31 May 2017
Location: Long Stratton, Norwich, Norfolk
Posts: 901

Wales 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

The thump is because the transmission is in a limphome mode where maximum line pressure is applied to protect the clutches (no slip). It could be oil in the connector to the gear box, it could be any number of things. It could even be an issue with the engine as the transmission will need accurate signals to be able to change gear correctly.
 1972 Range Rover Classic 2 door V8
2013 Land Rover Discovery 4 HSE - SCRAPPED
2016 Land Rover Discovery 4 Landmark
2022 Volvo XC40 T5 PHEV 282HP FWD 3 cylinder! 
 
Post #22861642nd Apr 2022 11:39 am
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Trailered Movements
 


Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1198

United Kingdom 2011 Discovery 4 3.0 SDV6 Commercial Auto Sumatra BlackDiscovery 4

An update on this, and further questions.

As the problem persists, it is now apparent it only happens when things are warm, today for instance, using my IID, once the gearbox temperature reached 74c, special functions and HDC not available on dash, stop and put it in P, and it wouldn't fire up or able to take it out of P for about 2 hours. I was parked on a slight slope which might not have helped.

I have changed the TCCM, which made no difference.

Although it seems 100% electrical, the fact that things have to get warm and take too long for an electrical unit to cool down, we are thinking electrical wires that sit in oil, as in the mechatronic unit.

The transmission place I asked the question of says the only unit he has ever changed was that in a BMW where the driver had been thrashing the car and there was not enough oil in the box. He is willing to change my unit, but is not 100% sure it would fix the problem.

Is there an external park position sensor on the 6 speed unit?

Could a faulty Transfer Box cause these issues?

Thanks

Dave

EDIT - The reason it won't start is because it says it is not in P, which it is.
 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago) 
 
Post #22871278th Apr 2022 6:52 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8041

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Have a look at this:
https://www.disco4.com/forum/autobox-gear-...rbox+pivot
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #22871869th Apr 2022 8:23 am
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8041

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Have a look at this, compliments to Disco_mikey Bow down :
https://www.disco4.com/forum/autobox-gear-...rbox+pivot
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #22871879th Apr 2022 8:25 am
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Trailered Movements
 


Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1198

United Kingdom 2011 Discovery 4 3.0 SDV6 Commercial Auto Sumatra BlackDiscovery 4

Thanks M3DPO, seen that before, linkage all OK.

Trawling through various sites and using various search words leads me to believe it needs a new mechatronic unit, the fact that it only happens when the oil is warm/hot indicative of position switches failing, and previous owners of the problem only fixing it with a new unit.


Dave
 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago) 
 
Post #22871979th Apr 2022 9:46 am
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Trailered Movements
 


Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1198

United Kingdom 2011 Discovery 4 3.0 SDV6 Commercial Auto Sumatra BlackDiscovery 4

To bring this post to a close, issue was indeed a failed mechatronic unit.

Specifically the Range Selector Switch, which is a non changeable part, unlike the valves.

Thanks to all who contributed.

Dave
 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago) 
 
Post #228931526th Apr 2022 4:23 pm
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