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Thread: Gearbox Fault Warning Light.

  1. #1
    Junior Member
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    Gearbox Fault Warning Light.

    Hello everyone: I own a 2000 XJR with about 82,000 miles. The car has been totally trouble free durum my ownership of 6 years. About 4 months ago I decided to have the transmission fluid and filter changed as a preventative maintenance measure. I've probably put on 1000 miles or so since with no issues.

    Today i I pulled away from a stop light and hear a clunk during the transmission shift. Shortly thereafter a warning light came on "Gearbox Fault" and the car would not shift out of 2nd. I pulled into a parking lot and turned the car off for a minute and then started it back up. The car drove normally again for about a mile to my son's house where I had dinner. Then later when I left I got about a mile down the road and the same thing happened again when pulling away from a stop light. Now in addition to the fault message the check engine light came on.

    I returned to my son's house and parked it.

    I'm wondering if anyone has any ideas as to what might be going on? Thanks in advance.

  2. #2
    Senior Member
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    Unless I'm very much mistaken, this is the classic XJ8 forward/input ("A") clutch drum failure. She has to go to the transmission hospital, I'm afraid. IIRC,there's a kit you can buy with an updated/redesigned drum.
    JagFab
    97MY Sea Frost Green Daimler Super V8 LWB 140K miles (RHD)

  3. #3
    Senior Member Andy K's Avatar
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    The supercharged ones have Mercedes gearboxes in them. Do you still think its the clutch drum ?

    Personally I would get the gearbox codes read and go from there
    XJR 2001 Pacific Blue
    Range Rover Sport 2005 Red 2.7 TD

  4. #4
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    Oops! I missed the 'R' bit! Ha, ha! I'll get me coat...
    JagFab
    97MY Sea Frost Green Daimler Super V8 LWB 140K miles (RHD)

  5. #5
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    Thanks for your feedback. I've got the car at a specialist here in Minneapolis called Top Gear Automotive. I'll let you know what they find. Best regards! Tom

  6. #6
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    I went through all of this with my XJ8 sport including having a transmission rebuilt which had been rebuilt 50,000 miles previously. The problem returned and I traced it down to the encoder on the throttlebody. More accurately the connector to the encoder. When I remove the connector cleaned everything up and re-plugged it in reset the computer and the problem went away. My suspicion is that there’s some bad code in the firmware which cannot recover from noise or bad data on that circuit. I found three other people by way of the Internet who had the exact same problem except they had to have their throttlebody rebuilt in order to get a new encoder.
    it will cost you nothing to disconnect and reconnect all the wires going to the throttlebody, do the battery reset and see what happens.

  7. #7
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    Thanks very much for the tip. My car is at a Jaguar specialist who was a Jaguar dealer mechanic for many years before setting out on his own. So far he believes it is electrical related and mentioned both the throttle body and ABS module as possible suspects but before going there is replacing the battery ground strap (mine looked a little worn he said) and checking all the other ground points. I will pass along your tip to him. Thanks and stay tuned!

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