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Thread: Discovery 3 Transmission Fault and recommended Perth repairers

  1. #11
    Join Date
    May 2014
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    Point Cook, VIC
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    786

    Discovery 3 Transmission Fault and recommended Perth repairers

    Quote Originally Posted by TDV6Robvdw View Post
    Thanks Bulletman - 265,000k on the clock.
    I will have a play with the cables.
    If the transmission has never had an oil and filter change then you should probably start to budget for a gearbox rebuild - but start with a flush and filter change plus some Dr Tranny as this can cure shudder problems and buy time.

    However, if the problem you are having is intermittent and sometimes it all comes good again - then definitely sounds like an electrical problem. When the D3 goes into fault mode, it can also cause the gear shift quality to change and if the gearbox is already worn then it will make it seem worse.

    Start by checking the earth cable mounting point behind the fuse box - it may have worked loose. Then check cables and plugs in general. The transfer box ECU is not well sealed and the plugs corrode out which will generate faults, and others have found broken and damaged cables in all sorts of places.

    You definitely need to get access to a fault code reader to see which faults were logged when the F fault came up. I have read one person even had the F fault come up due to a partially blocked fuel filter. The D3 ECUís can have faults generated in one system cause other unrelated faults in other systems - sort of a one out all out workplace rule. Even a blown brake light globe can cause unrelated ECU faults.

    As others have mentioned also replace the brake light switch. A faulty brake like switch will kill the throttle signal - and if intermittent could be the reason for sometimes having no throttle response. Plus it is a cheap part and you will need to replace at some point anyway.

    And a silly question - you donít use left foot braking by any chance? Even just resting a foot over the brake peddle can kill the throttle response.

    And all the above is to hopefully rule out needing to get the gearbox rebuilt. Keep posting what you find - eventually you will have that eureka moment.

  2. #12
    Join Date
    Apr 2020
    Location
    Perth
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    21
    Quote Originally Posted by DiscoDB View Post
    If the transmission has never had an oil and filter change then you should probably start to budget for a gearbox rebuild - but start with a flush and filter change plus some Dr Tranny as this can cure shudder problems and buy time.

    However, if the problem you are having is intermittent and sometimes it all comes good again - then definitely sounds like an electrical problem. When the D3 goes into fault mode, it can also cause the gear shift quality to change and if the gearbox is already worn then it will make it seem worse.

    Start by checking the earth cable mounting point behind the fuse box - it may have worked loose. Then check cables and plugs in general. The transfer box ECU is not well sealed and the plugs corrode out which will generate faults, and others have found broken and damaged cables in all sorts of places.

    You definitely need to get access to a fault code reader to see which faults were logged when the F fault came up. I have read one person even had the F fault come up due to a partially blocked fuel filter. The D3 ECUís can have faults generated in one system cause other unrelated faults in other systems - sort of a one out all out workplace rule. Even a blown brake light globe can cause unrelated ECU faults.

    As others have mentioned also replace the brake light switch. A faulty brake like switch will kill the throttle signal - and if intermittent could be the reason for sometimes having no throttle response. Plus it is a cheap part and you will need to replace at some point anyway.

    And a silly question - you donít use left foot braking by any chance? Even just resting a foot over the brake peddle can kill the throttle response.

    And all the above is to hopefully rule out needing to get the gearbox rebuilt. Keep posting what you find - eventually you will have that eureka moment.
    Thanks DiscoDB, I took the car back to the dealer where I purchased the car. They suggested a bunch of your points related to the electronics. I will also check the earth. The Bosch diagnostics highlighted a raft of faults including water in fuel etc etc.
    A bunch of the faults were reset to try and log the faults between the reset and now.

    Since the reset a few of my work commutes have been fault free. One drive the park brake fault would pop up and down and then stopped.

    Yesterday I got the spongey accelerator pedal during two separate trips which reset by putting the car into park and turning the vehicle off and on. On both occasions I could not shift back out of park until turning off the ignition.

    When there are no faults the car drives 100% fine but the intermittent nature of the faults that seem to be reset by cycling the ignition cause me to think itís electrical.

    The shudder at 90 k/hr is really minor and a Ďserviceí by changing oil, filter, the connector seal and maybe the seals between the valve body and gearbox hopefully will sort that out.

    Time to clean some terminals, wiggle some wires and tighten some earths that may have been loosened by the corrugated roads or first decent wet weather stronger than the typical showers.

  3. #13
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    May 2014
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    Discovery 3 Transmission Fault and recommended Perth repairers

    Certainly sounds electrical. I had a suspension fault which started the same way - initially could be reset by ignition off and back on, then over time it needed a hard reset, sometimes it would just come and go on itís own accord, and then eventually it stayed faulted continuously.

    This is what I found at the transfer control unit....



    If not found early corroded connectors will destroy the pins on the ECU.

    But this can happen almost anywhere on the D3. Water and electronics donít mix. Plus you can have problems with damaged wiring just due to incredible density of wiring runs throughout the car all packed tightly together.

    A collection of horror stories from other people around the world.....







  4. #14
    Join Date
    Oct 2012
    Location
    Perth
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    Discovery 3 Transmission Fault and recommended Perth repairers

    Autocode are Perth specialist LR electrical fault guys. Nearby Jordan Rovertec mechanics.


    European Car Service | Performance Tuning | Diagnostic Fault Finding

  5. #15
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    Oct 2012
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    Perth
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    Quote Originally Posted by DiscoDB View Post

    This is what I found at the transfer control unit....



    If not found early corroded connectors will destroy the pins on the ECU.

    But this can happen almost anywhere on the D3. Water and electronics donít mix. Plus you can have problems with damaged wiring just due to incredible density of wiring runs throughout the car all packed tightly together.
    Worth pulling those plugs and giving a light crc style spray?

  6. #16
    Join Date
    Mar 2016
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    Perth
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    Quote Originally Posted by PerthDisco View Post
    Worth pulling those plugs and giving a light crc style spray?
    Got to Jaycar/Altronics and get some contact cleaner with lubricant. Itíll clean the terminals and the lubricant will stop further corrosion
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  7. #17
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    May 2014
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    Quote Originally Posted by DiscoJeffster View Post
    Got to Jaycar/Altronics and get some contact cleaner with lubricant. Itíll clean the terminals and the lubricant will stop further corrosion
    Thatís exactly what I did. Highly recommend everyone with a D3 pull the plugs and inspect. Next opportunity I will do the same with any connectors beneath the car.

    Some of the photos are from a quick search and show this even happens with the gear selector connector.

    Needs to leak more oil like a proper LR to keep everything coated in an oil film.......

  8. #18
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    Apr 2020
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    Perth
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    Quote Originally Posted by DiscoDB View Post
    Certainly sounds electrical. I had a suspension fault which started the same way - initially could be reset by ignition off and back on, then over time it needed a hard reset, sometimes it would just come and go on itís own accord, and then eventually it stayed faulted continuously.

    This is what I found at the transfer control unit....



    If not found early corroded connectors will destroy the pins on the ECU.

    But this can happen almost anywhere on the D3. Water and electronics donít mix. Plus you can have problems with damaged wiring just due to incredible density of wiring runs throughout the car all packed tightly together.

    A collection of horror stories from other people around the world.....
    Wow - what a collection. I spent some time last Friday inspecting, pulling plugs and connectors looking for green corrosion etc. Everything looked pretty good. I cleaned and sprayed various plugs behind the primary battery.

    I removed the underbody protection and gave everything a wiggle - everything seemed pretty solid.

    I have only had the transmission fault pop up twice after daily driving to work and back and a six hour drive on the weekend. The main fault occurring now is a Park Drive fault. The stereo goes quiet whilst the fault illuminated on the dash and then sound is restored.

    Quick question, is there much wiring underneath the passenger carpet/mat? This area got extremely wet during the trip to Denham / Steep Point. I had to remove the mat to allow it and the carpet to dry. Iím curious if there is wiring or a connector in this area that has been water affected.

    Cheers and thanks for your advice and recommendations!!

  9. #19
    Join Date
    Apr 2020
    Location
    Perth
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    Quote Originally Posted by PerthDisco View Post
    Autocode are Perth specialist LR electrical fault guys. Nearby Jordan Rovertec mechanics.


    European Car Service | Performance Tuning | Diagnostic Fault Finding
    Cheers! I might give them a call.

  10. #20
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    Oct 2012
    Location
    Perth
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    Quote Originally Posted by TDV6Robvdw View Post
    Wow - what a collection. I spent some time last Friday inspecting, pulling plugs and connectors looking for green corrosion etc. Everything looked pretty good. I cleaned and sprayed various plugs behind the primary battery.

    I removed the underbody protection and gave everything a wiggle - everything seemed pretty solid.

    I have only had the transmission fault pop up twice after daily driving to work and back and a six hour drive on the weekend. The main fault occurring now is a Park Drive fault. The stereo goes quiet whilst the fault illuminated on the dash and then sound is restored.

    Quick question, is there much wiring underneath the passenger carpet/mat? This area got extremely wet during the trip to Denham / Steep Point. I had to remove the mat to allow it and the carpet to dry. Iím curious if there is wiring or a connector in this area that has been water affected.

    Cheers and thanks for your advice and recommendations!!
    In the passenger footwell outside kick panel there is wiring coming from the switch panel behind the glovebox plus runs down length of car under the LR emblazoned plastic strip at the door entry point

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