Gearbox fault question
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Thread: Gearbox fault question

  1. #1
    FRESHMAN ROVER
    Join Date
    September 14th, 2011
    Location
    Omaha,Ne
    Posts
    11

    Gearbox fault question

    Hey guys,

    I have a question about the gearbox fault. On the way home as I was turning into my development I got a gearbox fault message. Also my tac started bouncing up and down. The screen on my climate control went blank and the truck had a hard time getting up the driveway into the garage. I have searched and people say it is usually the battery. How does the battery affect the gearbox and how can I be sure thats it.
    2001 4.6 HSE 148,000

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  3. #2
    FRESHMAN ROVER
    Join Date
    September 14th, 2011
    Location
    Omaha,Ne
    Posts
    11

    Re: Gearbox fault question

    Also once I got it into the garage I turned the truck off and restarted it. Everything came back on and seemed normal. I took it around the block real quick and it happened again only this time the service engine soon light came on.
    2001 4.6 HSE 148,000

  4. #3
    SITE ADMINISTRATOR RRToadHall's Avatar
    Join Date
    April 12th, 2006
    Location
    Maltby, WA USA
    Posts
    15,663

    Re: Gearbox fault question

    Definately sounds like your charging. Once voltage drops all sorts of odd thigns happen. Gearbox fault is one of the primary ones. ONce in fault most your gear box will be locked to 3rd gear until reset/the fault clears. TO check your battery, alternator and charging system simply run through the tests in the electrical troubleshooting stickie above and report your reading back here. It could be a failing battery, dying alternator or just a dirty cable.
    Sucking at something is the first step to becoming sorta good at something.

  5. #4
    JUNIOR ROVER
    Join Date
    August 2nd, 2007
    Location
    Southern California, USA
    Posts
    659

    Re: Gearbox fault question

    I agree w/ ToadHall, definitely charging related.

    All the symptoms, including gearbox fault, point towards an alternator going bad.

    If you keep going at this rate, you'll start to see even weirder symptoms like HVAC turning itself off, radio going off or buzzing, NAV screen turning off...SRS light going off.....Essentially, anything and everything electrical related starts to go haywire....

    You can do the electrical test to be sure, or just have the alternator rebuilt or replaced.
    02 P38
    SoCal, USA

  6. #5
    FRESHMAN ROVER
    Join Date
    January 9th, 2011
    Location
    Brisbane, Australia
    Posts
    136

    Re: Gearbox fault question

    Definitely battery. If the battery is more than about 3 years old, or less in harsh conditions then I bet it's that. If the battery and alternator checks out then do the rounds on all the earth points and BeCM connectors, to make sure you are getting the electrons flowing in the right places.
    Glen Hendry
    Brisbane, Australia. 2000 P38A. HSE. 4.6. LPG. Auto. Dual Batteries. "Ranger Stacey". My first ever LR.

  7. #6
    FRESHMAN ROVER
    Join Date
    September 14th, 2011
    Location
    Omaha,Ne
    Posts
    11

    Re: Gearbox fault question

    Thanks for the info guys. Looks like I'll have to go get a multimeter. Problem is this is just the worst timing. Wife is out of town and I've got the kids here running around. I need the vehicle up and running to get to a family x mass party this weekend. To save time would the dealer be able to nail it on the first try. Or is this going to be an issue. I'll look at all the conections while the girls are taking their nap today but thats about all the time I'll have for it today.
    2001 4.6 HSE 148,000

  8. #7
    JUNIOR ROVER
    Join Date
    August 2nd, 2007
    Location
    Southern California, USA
    Posts
    659

    Re: Gearbox fault question

    Well, w/ all the symptoms that you're describing, especially about the erratic behavior of the tachometer (tach gets its input from the alternator), I say you need a alternator rebuild. You can get a new alternator or get yours rebuilt. Not sure about Omaha, but here in California, I can get one rebuilt for about $75, and the turnaround is about 3 hours.

    If you're handy with tools, you can definitely get this thing done in half a day. If you're experienced with repairs, shouldn't take more than 2-4 hours.

    As for the dealership, I'm pretty sure they can diagnose this problem pretty easily. If they are trustworthy, they will say that it's the alternator. If not, they will say that they will have to do a full electrical diagnosis, and perhaps even blame the becm.

    Good luck
    02 P38
    SoCal, USA

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