jc999
Member Since: 28 Sep 2020
Location: lockerbie
Posts: 10
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| discovery 4 gearbox fault |
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please help will not start error code u0402 invalid signal from tcm also p0915 gearshaft position- circuit rang/performance it will not start new battery and checked earth wire will not start in nutral or park lights come on them off within 2 seconds also come up with gear leaver not in park
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 28th Sep 2020 4:28 pm |
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disco4ever
Member Since: 23 Dec 2013
Location: under the car
Posts: 402
  
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most likely a missing connection or water ingress, i.e. corrosion in the module. please check the wiring leaving the TCM. Achim
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
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| 28th Sep 2020 5:12 pm |
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jc999
Member Since: 28 Sep 2020
Location: lockerbie
Posts: 10
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where is the tcm located the tcm is not behind battery this is the later model
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| 28th Sep 2020 6:12 pm |
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darrind
Member Since: 04 Jul 2008
Location: In A World of My Own!
Posts: 2863
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Is it a 6 or 8 speed box you have?
The 8 speed can have issues with the gear change rotary selector failing Must stop buying shiny toys....
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| 28th Sep 2020 6:44 pm |
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jc999
Member Since: 28 Sep 2020
Location: lockerbie
Posts: 10
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6 speed
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| 28th Sep 2020 6:47 pm |
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darrind
Member Since: 04 Jul 2008
Location: In A World of My Own!
Posts: 2863
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check as previously posted and also how is the linkage on the gear selector cable where it mounts to the gearbox lever - has it seized? Must stop buying shiny toys....
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| 28th Sep 2020 8:17 pm |
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jc999
Member Since: 28 Sep 2020
Location: lockerbie
Posts: 10
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gear linkage is ok and is moving free
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| 28th Sep 2020 8:35 pm |
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jc999
Member Since: 28 Sep 2020
Location: lockerbie
Posts: 10
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the pervious post does not tell me where the tcm unit is located
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| 28th Sep 2020 8:36 pm |
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disco4ever
Member Since: 23 Dec 2013
Location: under the car
Posts: 402
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the control unit sits in the engine compartment on the right behind the battery & fuses (LHD), so I assume it is on the left on a RHD vehicle.
From there you need to follow the wiring towards the gear box where it ends in a round insulating sleeve going into the mechatronic.
I suggest you download the workshop manual to get more explosion drawings etc. Achim
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
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| 29th Sep 2020 6:56 am |
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jc999
Member Since: 28 Sep 2020
Location: lockerbie
Posts: 10
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RHD ITS NOT behind the battery & fuses ITS ONLY THE ECU BEHIND THE BATTERY
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| 29th Sep 2020 7:22 am |
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disco4ever
Member Since: 23 Dec 2013
Location: under the car
Posts: 402
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you are right, got confused with the transfer box module.
TCM sits inside the auto box with external round plug. Which could cause trouble as well when o-ring is knackered and oil gets into the plug. Achim
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
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| 29th Sep 2020 10:14 am |
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jc999
Member Since: 28 Sep 2020
Location: lockerbie
Posts: 10
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can it be removed without removeing the gearbox
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| 29th Sep 2020 10:49 am |
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disco4ever
Member Since: 23 Dec 2013
Location: under the car
Posts: 402
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yes, it can. you need to take the sump off. but this would be my last action. I guess you are having a wiring issue. Achim
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
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| 29th Sep 2020 11:30 am |
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jc999
Member Since: 28 Sep 2020
Location: lockerbie
Posts: 10
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don't know will not start fault codes above says not in park but still will not start in neutral is there any way to bypass the gearbox to get it started
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| 29th Sep 2020 11:57 am |
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disco4ever
Member Since: 23 Dec 2013
Location: under the car
Posts: 402
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it will help to know what you have checked already. also try a hard reset and report back. Achim
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
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| 29th Sep 2020 12:03 pm |
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