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Old 09-15-2011, 09:22 PM   #1 (permalink)
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Default Gearbox fault, I've tried EVERYTHING! HELP!!!

Ok 95 Range Rover 4.0 P38... I turn the key, without starting, and immediately have a gearbox fault message. I have tried a new battery and different alternator, when I turn it over it drops to 11.3-11.5 and quickly ramps to 13.7-14.1 once it has started. Put it in drive and it shifts at 2200 RPMs in every gear, yes I have access to all gears, I can put it in 1st and hold the gear but it doesn't have as much power still. The check engine light is on thinking it is the o2 sensors... I have checked the MAF and TPS sensors by replacing them and the seem to be working. When I'm coming to a stop it down shifts HARD into 2nd and 1st. Any grounds that you know of that I should check would be awesome or if you think it's the ECU... I'm trying to avoid taking it somewhere just so they can give me and bill and still have a car with a problem.... Thanks for all the help!!!
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Old 09-15-2011, 10:29 PM   #2 (permalink)
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Have you actually pulled the codes to see what the truck is telling you?
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Old 09-15-2011, 11:00 PM   #3 (permalink)
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I didn't think my car had OBDII and thus I have no idea how to retrieve the codes. I take it that a dealer has to do it?
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Old 09-16-2011, 05:08 PM   #4 (permalink)
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Post your location, as we are not mind readers and have no idea where you are located at..
The OBD plug is in the passenger footwell (NAS spec LHD).
Go to a parts store and have them read the codes for you.
Post the results.

Martin
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Old 09-25-2011, 08:30 PM   #5 (permalink)
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pull your codes.

mine was starting to do the same thing. it ended up being the crankposition sensor. the part was $75 and only took about a hour to swap out. my hands are to fat to get into it easily. once i swapped it out, all my problems went away.
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Old 09-26-2011, 06:20 AM   #6 (permalink)
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While one should certainly investigate the easy and cheap OBD-II scanner responses, if this turns out to be a transmission/controller problem, you'll need to take it to someone with a Rover-specific diag computer.

The most common cause for the fault you have is electrical-related. It will be interesting to find out what the issue is here.
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Old 10-21-2011, 07:03 PM   #7 (permalink)
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Why dont you just check and drain the transmission fluid? Draining the transmission is as easy as changing the oil on our trucks.. May not take away the codes but probably will help with the rough shifts. The bolt is on the bottom of the transmission. Once you got it all out, make sure you use a strong thread locker to keep the fluid from leaking out when you drive.
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Old 10-21-2011, 07:35 PM   #8 (permalink)
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probably since he hasn't been back since the last time he posted.
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Old 11-08-2011, 05:53 AM   #9 (permalink)
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I was having the same issues, and my tach was dropping to 0 which led me to thinking it was a voltage-related issue. I replaced the alternator, battery, and both battery cables, mainly because they were all in need of replacement. That fixed the tach and other minor problems, but not the gearbox fault message.

It turns out that the transmission wiring harness clip, close to the bell housing, had broke. As a result, one of the fine gauge wires in the transmission harness was making contact with the spinning driveshaft which resulted in the wire becoming severed. I soldered the wire back together and relocated the harness - the fault went rite away.

Also check the transmission and transfer case ECU's. Hope this helps.

-Mark
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Old 11-20-2011, 10:17 PM   #10 (permalink)
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When i meet such prolbem,i will find my car engineer or other person for help.
i know one engineer at www.obdiichina.com is very professional in solving car problem,he help me much,maybe you can find him!
This is only my suggusetion!
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