Member Since: 06 Sep 2013
Location: Alunda
Posts: 330
P0915 Gearbox fault
Hello,
My D4 with 6 speed automatic has startes to warn for gearbox fault. Together with that I also get that HDC is not available. It happens sporadically and a restart of the car removes it. It mostly happens when stationary and shifting to P but today it happened during cruising and the car felt sluggish and didn´t want to change gear. A restart cures it and car works fine and shifts gears fine again. I read the codes and I only have one code for the gearbox which is P0915 Gearshift position - Circuit range/performance. I will put the car on the lift and check for suspicious electrics but I just wanted to check with the expertise of the forum for tips where to start looking.
Thanks
Peter2011 Discovery 4 3.0 TDV6 S Automatic
1999 Discovery 2 V8 ES Automatic
Earlier
2006 Discovery 3 TDV6 SE Automatic
1996 Discovery 300 Tdi ES Automatic
1975 Series 3 2.25 diesel
Nanocom Evolution for D2 V8, D3 and D4
Working kelpies for working the sheep
12th Oct 2020 7:54 am
PeterTh
Member Since: 06 Sep 2013
Location: Alunda
Posts: 330
More clues. I checked reoccuring faults after clearing the codes and besides the P0915 in the Automatic gearbox ECU I also get U0402 - Invalid data recieved from transmission control module in the ABS system, the parking brake and the transfer case ECU:s.
//Peter2011 Discovery 4 3.0 TDV6 S Automatic
1999 Discovery 2 V8 ES Automatic
Earlier
2006 Discovery 3 TDV6 SE Automatic
1996 Discovery 300 Tdi ES Automatic
1975 Series 3 2.25 diesel
Nanocom Evolution for D2 V8, D3 and D4
Working kelpies for working the sheep
12th Oct 2020 7:02 pm
PeterTh
Member Since: 06 Sep 2013
Location: Alunda
Posts: 330
Not so many replies unfortenately but I can report if someone else have similar problems that cleaning and lubricating the gear linkage at the gearbox seems to have cured the problem; at least for the last 14 days.
//Peter2011 Discovery 4 3.0 TDV6 S Automatic
1999 Discovery 2 V8 ES Automatic
Earlier
2006 Discovery 3 TDV6 SE Automatic
1996 Discovery 300 Tdi ES Automatic
1975 Series 3 2.25 diesel
Nanocom Evolution for D2 V8, D3 and D4
Working kelpies for working the sheep
2nd Nov 2020 3:38 pm
disco4ever
Member Since: 23 Dec 2013
Location: under the car
Posts: 402
have a look at the mechatronic sleeve, if oil poisoned the connector it may throw up all kind of faultsAchim
own garage certified LR tech
Disco 2 TD5 MY 2001 - gone but still driven by another owner
Defender 110 TD5 driving me bananas with all faults
Disco 3 TDV 6 HSE MY 2005 gone @280.000 km
Disco 4 SDV 6 HSE MY 2012
2nd Nov 2020 4:36 pm
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
P0915 -00
Gear Selector Position Circuit Range / Performance
Short circuit a
mass,
on nutrition,
open circuit o
high strength
in the circuit of
sensor of
location of
scooter of the
transfer box
Short circuit a
mass,
short circuit on
supply,
open circuit,
high strength
in the circuit of
sensor of
location of
fork of
selection of
transfer box
Sensor failure
position of the
fork of
selection of
transfer box
Motor failure
transfer box
Module failure
command box
referral
Consult the wiring diagrams and check
the possible presence of a short circuit a
ground, of a short circuit on
power supply, an open circuit or
a high resistance in the circuit of the
NOTE:
The resistance of the motor of the
transfer box must be
between 0.2 Ohm and 10.0 Ohm
NOTE:
In case of registration of other DTCs
related to box failures
return, first execute the
appropriate corrective actions, therefore
repeat the test
The sensor voltage of
position of the motor of the
transfer box (from the power supply
of the sensor to the mass of the
sensor) must be between
8 V and 11 V; resistance from
signal circuit A to the circuit of
mass must be between
16.0 Kohm and 20.0 Kohm and the
resistance from the signal circuit
B to the ground circuit must be
between 16.0 Kohm and 20.0
Kohm
The sensor voltage of
position of the selector fork
transfer case (from the circuit
power supply to the circuit
mass) must be between
4.0V and 6.0V
1247 motor position sensor of the
transfer box
Consult the wiring diagrams and check
the possible presence of a short circuit a
ground, of a short circuit on
power supply, an open circuit or
a high resistance in the circuit of the
fork position sensor
transfer box selection
Using the diagnostic system
approved by the manufacturer, clear the DTCs
and repeat the test. If the fault persists,
replace the position sensor of the
transfer case selection fork
and perform the "Replacement
transfer case "
Using the diagnostic system
approved by the manufacturer, clear the DTCs
and repeat the test. If the fault persists,
fit a new motor to the box
return and carry out the procedure
"Replacement of transfer case"
Using the diagnostic system
approved by the manufacturer, clear the DTCs
and repeat the test. If the fault persists,
mount a new command module
transfer case and carry out the
procedure "Replacing the box
postponement "Discovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition IID Pro MV License
3rd Nov 2020 1:26 pm
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
U0402-68
Invalid data received from TCM
Missing or invalid data from the command module exchange
Using the manufacturer's approved diagnostic system, check the shift control module for any related DTCs and consult the relevant DTC indexDiscovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition IID Pro MV License
3rd Nov 2020 1:29 pm
PeterTh
Member Since: 06 Sep 2013
Location: Alunda
Posts: 330
Thanks dgardel!
Where is the text from as I haven´t found it in the workshop manual?
//Peter2011 Discovery 4 3.0 TDV6 S Automatic
1999 Discovery 2 V8 ES Automatic
Earlier
2006 Discovery 3 TDV6 SE Automatic
1996 Discovery 300 Tdi ES Automatic
1975 Series 3 2.25 diesel
Nanocom Evolution for D2 V8, D3 and D4
Working kelpies for working the sheep
3rd Nov 2020 2:57 pm
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
Taken from the workshop manual... Discovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition IID Pro MV License
3rd Nov 2020 2:59 pm
PeterTh
Member Since: 06 Sep 2013
Location: Alunda
Posts: 330
Ok, weird. The one I am looking in is for D4 year 2009-2011 published in may 2011 and it only has the P0915-01 and P0915-64 but I will look again. Which version do you have?
//Peter2011 Discovery 4 3.0 TDV6 S Automatic
1999 Discovery 2 V8 ES Automatic
Earlier
2006 Discovery 3 TDV6 SE Automatic
1996 Discovery 300 Tdi ES Automatic
1975 Series 3 2.25 diesel
Nanocom Evolution for D2 V8, D3 and D4
Working kelpies for working the sheep
3rd Nov 2020 3:09 pm
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
You have a PMDiscovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition IID Pro MV License
3rd Nov 2020 4:06 pm
DiscoJimbo
Member Since: 27 Feb 2017
Location: Belfast
Posts: 10
Hi Peter, did you ever resolve this problem? I've got the same problem
27th May 2022 3:51 pm
PeterTh
Member Since: 06 Sep 2013
Location: Alunda
Posts: 330
Well, not really. By cleaning earth points and adjusting/lubricating the gearbox linkage under the car it gets temporarely better but reoccurs after some time. I am pretty sure the problem is the gear position sensor in the TCM in the autobox. It can be exchanged and there is one company in Bulgaria that do it. Will end up there eventually when it happens to often or the car won’t start due to believing it is not in Park. If you go to Land Rover it is a new Mechatronic unit (includes the TCM) which is not cheap. I assume more and more British Discos will have this fault and maybe there is a solution in the UK now?
Do you have the same problem?
/Peter2011 Discovery 4 3.0 TDV6 S Automatic
1999 Discovery 2 V8 ES Automatic
Earlier
2006 Discovery 3 TDV6 SE Automatic
1996 Discovery 300 Tdi ES Automatic
1975 Series 3 2.25 diesel
Nanocom Evolution for D2 V8, D3 and D4
Working kelpies for working the sheep
27th May 2022 4:38 pm
DiscoJimbo
Member Since: 27 Feb 2017
Location: Belfast
Posts: 10
Yes however I think it might be the selector stick/mechanism as the trigger is not really working well
27th May 2022 5:02 pm
DiscoJimbo
Member Since: 27 Feb 2017
Location: Belfast
Posts: 10
The problem has become worse, it throws up a transmission fault every time I drive it, mostly when stopped and shifting from D to R then onto P. same fault code P0915-01. I will have a look at the selector mechanism this week.
31st May 2022 1:01 pm
PeterTh
Member Since: 06 Sep 2013
Location: Alunda
Posts: 330
I can now add that my problem escalated so needed to do something. Removed the Mechatronic unit and removed the TCM. Sent it to Softelectronic (https://www.softelectronic.com/) in Bulgaria for repair. Not cheap but much cheaper than a new Mechatronic unit. All is now back in the car with new seals for the Mechatronic unit. So far all seems to work but need more time before I can say it is a definitiv fix.
//Peter2011 Discovery 4 3.0 TDV6 S Automatic
1999 Discovery 2 V8 ES Automatic
Earlier
2006 Discovery 3 TDV6 SE Automatic
1996 Discovery 300 Tdi ES Automatic
1975 Series 3 2.25 diesel
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