Advertise on DISCO3.CO.UK
Forum · Gallery · Wiki · Shop · Sponsors
DISCO3.CO.UK > Faults & Fixes (D4)

P0915 - what would cause the gearbox to Clunk between P/N/D?
Post Reply  Down to end
Page 1 of 2 12>
GBL78
 


Member Since: 03 May 2024
Location: Shrewsbury
Posts: 10

United Kingdom 2010 Discovery 4 TDV6 HSE Auto Baltic BlueDiscovery 4
P0915 - what would cause the gearbox to Clunk between P/N/D?

Hi,

Chasing around P0915 "Gearshift Position - circuit range/performance".

I can see it comes up here and there, but nothing concrete in terms of solution, although all of the symptoms are described in other posts, there isn't a resolution. These include U0402 and a selection of faults derived from invalid data from the TCM. (but I don't think its the TCM at fault)

Test Gear = Icarsoft LR3
Brake Switch = OK (changed anyway, but registering correctly in live data)
Battery = OK (meter tested and ECU recognises as good)
TCM Module = Dry, no corrosion (haven't removed, but will at some point if needs be)

This fault occurs when moving from P/N/D etc, sometimes when static. Never when driving.

99% of the time, the gearbox is smooth between selections of P/N/D.
1% of the time AND coinciding with P0915, the gearbox "Clunks" between P/N/D. Going into P, the selector will be locked into place until fault cleared or ignition cycled.

When P0915 occurs and the selector is on D, the TCM Live Data Reads:
Gear Commanded: Invalid/unknown
Transmission Gear Engaged: Invalid/unknown

On clearing the fault, the Live Data shows the 1st gear Commanded and Selected - as you would expect.

Whilst the symptoms are "mechanical" I feel the cause is "electrical", because the fault can be cleared and the P/N/D shifting is immediately smooth again.

This is where I need some expert advice from someone that really knows the cars as I am NO mechanic, but after £360 at a LR specialist, the fault is exactly the same.

1. What "thing" would need to stop working in an automatic LR4 transmission for it to start clunking between P/N/D?
2. Why would this "thing" stop working and what does clearing the TCM Module fault do in order to rectify the situation?
3. Could it be the gear position sensor?

Any help sincerely appreciated. I have tried to capture a live data recording at the time of the problem, but there is nothing that sticks out at all.

I will 100% come back with what has happened... I can see that this is frustrating when people don't...

Cheers

G
  
Post #23680743rd May 2024 6:12 pm
View user's profile Send private message View poster's gallery Reply with quote
GBL78
 


Member Since: 03 May 2024
Location: Shrewsbury
Posts: 10

United Kingdom 2010 Discovery 4 TDV6 HSE Auto Baltic BlueDiscovery 4

Removed headlight and improved GND connections, also on connections next to fusebox/battery. Both showed signs of corrosion, but nothing too bad.

Removed battery and checked ECU for water ingress etc. Didn't take apart but connectors were clean and the casing was fine, no signs of water nearby.

Took for a drive and fault occurred. Sad

I have played all my cards!
  
Post #23681214th May 2024 1:13 pm
View user's profile Send private message View poster's gallery Reply with quote
PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4856

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Try transfer case recalibration!
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #23681284th May 2024 3:45 pm
View user's profile Send private message View poster's gallery Reply with quote
GBL78
 


Member Since: 03 May 2024
Location: Shrewsbury
Posts: 10

United Kingdom 2010 Discovery 4 TDV6 HSE Auto Baltic BlueDiscovery 4

Thanks. Done. Will report back.

During the period that the car has this fault:
Actuator Supply Voltage 3.09V

Normal Running:
Actuator Supply Voltage 14.5V

But I don't know if this is a purposeful reduction in V or if its a loose cable is the actual cause of the fault.

Consulted the wiring diagram today and checked all wiring + earths that I could get to. Unfortunately the "good stuff" is on the transmission and out of my reach/expertise.

Cheers

G
  
Post #23681394th May 2024 7:43 pm
View user's profile Send private message View poster's gallery Reply with quote
GBL78
 


Member Since: 03 May 2024
Location: Shrewsbury
Posts: 10

United Kingdom 2010 Discovery 4 TDV6 HSE Auto Baltic BlueDiscovery 4

Transfer Case Recalibration (reset) did nothing. You can tell "something" has happened, but the fault is just as likely/often.
  
Post #23681995th May 2024 6:36 pm
View user's profile Send private message View poster's gallery Reply with quote
grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6295

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

might be of help


Click image to enlarge
  
Post #23682025th May 2024 6:56 pm
View user's profile Send private message View poster's gallery Reply with quote
grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6295

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

might as well be electrical issues in gear selector itself, have you taken it apart to check for damage on circuitboards?

or have you checked transfer case solenoid for operation? I had general gearbox fault due to leak which was getting into solenoids connectro completely confusing whole system

Greg
  
Post #23682045th May 2024 6:59 pm
View user's profile Send private message View poster's gallery Reply with quote
PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4856

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

The issue could be simple (shift cable adjuster sticking) or not so simple (TCM plug/wiring or mechatronic unit/plug/wiring)

Are you scanning all modules, and are there any other faults logged in them?
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #23682065th May 2024 7:09 pm
View user's profile Send private message View poster's gallery Reply with quote
GBL78
 


Member Since: 03 May 2024
Location: Shrewsbury
Posts: 10

United Kingdom 2010 Discovery 4 TDV6 HSE Auto Baltic BlueDiscovery 4

grzesiul wrote:
might as well be electrical issues in gear selector itself, have you taken it apart to check for damage on circuitboards?

or have you checked transfer case solenoid for operation? I had general gearbox fault due to leak which was getting into solenoids connectro completely confusing whole system
Greg


Hi Greg, Cool Name...

Thanks for the document, I will work it through.

With regards to the solenoid, I don't know how to check its working. Should I remove it? (its the part in pic attached right?)

Out of interest... if the solenoid stopped working, would the gearbox bump between P/N/D? This only happens when the fault occurs, all other times its very smooth.

I can tell why garage was reluctant to get into this...! (I have learnt a lot... about cars...)

Cheers

G
  
Post #23682235th May 2024 10:18 pm
View user's profile Send private message View poster's gallery Reply with quote
grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6295

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

Hey,
Soleniodshould be working fine if transfer case goes to low range with no issues. Just mentioned it as its connector flooded in oil caused major gearbox faults on mine two years back.
Also I ma not sure but I guess your D4 being 2010 is 6 speed?
If it was 8 speed which i doubt i could sent you my old gear shifter module to help in troubleshooting if it not shifter issue.

I would defo look into mentioned shifter cable as well as shifter body.

Rgds
Greg
  
Post #23682346th May 2024 9:25 am
View user's profile Send private message View poster's gallery Reply with quote
GBL78
 


Member Since: 03 May 2024
Location: Shrewsbury
Posts: 10

United Kingdom 2010 Discovery 4 TDV6 HSE Auto Baltic BlueDiscovery 4

Hi Greg,

Yes, 6 speed, thanks for the offer - very kind. It does go into hi/lo with no trouble. It drives very well (until this fault occurs).

The shifter is something I can look at today. Will read up on that.

Will come back to PROFSR when I have a list of the faults.

Cheers

Greg
  
Post #23682396th May 2024 10:02 am
View user's profile Send private message View poster's gallery Reply with quote
grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6295

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

if drives well i bet it issomething with shifter while switching gears

good luck
Greg
  
Post #23682446th May 2024 10:35 am
View user's profile Send private message View poster's gallery Reply with quote
GBL78
 


Member Since: 03 May 2024
Location: Shrewsbury
Posts: 10

United Kingdom 2010 Discovery 4 TDV6 HSE Auto Baltic BlueDiscovery 4

I removed the gear selector in the console. It was very dirty, but I couldn't see anything that I could usefully "do" to it. The "gear commanded" on the ECU does read correctly.

I measured the resistance of the transfer box motor, it is so completely wrong, that it must be me measuring it badly.

Really don't know what to do next as the garage has said just to keep driving it until it gets worse. But that doesnt seem like a good solution...


Click image to enlarge
  
Post #23683818th May 2024 9:34 am
View user's profile Send private message View poster's gallery Reply with quote
philipLR4
 


Member Since: 25 Mar 2024
Location: Limpopo
Posts: 10

South Africa 2010 Discovery 4 5.0 V8 HSE Auto Arctic FrostDiscovery 4

I had the same problem and changed the fluids and the four tube seals and element seal in the mechatronic. Posted my experience under D4 maintenance/mods.....5.0 V8 ZF 6HP. The transmission fault came up mostly while idle in Park but sometimes during driving. It is much better now but not completely gone. As it has become so much better it must have something to do with fluid pressure change inside the transmission and mechatronic. The transmission has always shifted well but when the fault code appears there was also the "clonk" when moving the shifter to R or D. The only remaining fault code is now from transfer case four-wheel drive low range indicator-short circuit to battery P1810. But I also do have faults from the BCM about driving lamps relay coil circuit. So I wonder if this is related? Battery is new as I know the D3&4 are sensitive with a bad battery.

Have you come across any new hints on your transmission faults?
  
Post #23707639th Jun 2024 10:46 am
View user's profile Send private message View poster's gallery Reply with quote
GBL78
 


Member Since: 03 May 2024
Location: Shrewsbury
Posts: 10

United Kingdom 2010 Discovery 4 TDV6 HSE Auto Baltic BlueDiscovery 4

Hi, sorry for the very late reply.

No… nothing has changed. The fault is almost constant. It sometimes does not permit starting due to “gearbox fault”. If it does start and run then usually moving from D into R causes the fault to come on (a terrible situation when doing a 3 point turn as you have to reset the fault!)

LR specialist has no ideas apart from to leave it until it completely fails then trace the problem.

Without being able to reset the fault codes, the car would be undrivable.
  
Post #237193826th Jun 2024 9:45 pm
View user's profile Send private message View poster's gallery Reply with quote
Display posts from the last:  
Post Reply Back to top
Page 1 of 2 12>
Jump to:  
Previous Topic | Next Topic >


Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



DISCO3.CO.UK Copyright © 2004-2024 Futuranet Ltd & Martin Lewis
DISCO3.CO.UK RSS Feed - All Forums

DISCO3.CO.UK is independent and not affiliated to Land Rover.
Switch to Mobile Site