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Sheena

Disco 3 gear gear sticking in 1st/2nd, transmission fault

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I have a 2006 Disco 3 HSE (@40kmiles) had been sticking in low gears (when it typically has been running for more than an hour) - not changing up till about 4.5k revs - which must be putting a lot of over reving on the gear box, it only seems to do it from 1st to 2nd or 2nd to 3rd - not any of the higher gears, if I use the sport mode, I can change up manually - which to me shows it isn't a gearbox problem...(perhaps) more a clutch or throttle play cable issue? Told Landrover but typically never failed when they test drove it - so couldn't identify a problem, and cannpot fix what they cannot diagnose - no fault coming up at this point.

Now yesterday, whilst out on a long drive, it started to stick at low speed again, and then suddenly on the motorway we got the "transmission fault" light, HDC, and suspension lowering warnings come up. So poodled up the M3 at 50 on lowered supension, until we could come off. We then turned everything off and waited 5 mins, by which everything seemed fine, then again after about 10mins, same thing happened. Second time we managed to get all the way home with no errors.

Now, having just replaced the whole supension kit in the car and new brakes and dif seal etc, (loads of money!) I really don't want to turn up to Landrover (mum with 3 young kids) and have them give me a long list of things that need doing(and £££££ to do it)if not totally necessary, just because the faults came up etc.

So if anyone knows what the gear sticking problem may be, without having to get a whole new gearbox etc, I would be very happy for the help, so I can explain to them what to look for - before they have to take the whole car apart and take 2 days to find a problem ( like last time re suspension, etc, etc)and the labour cost involved.

thanks

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If a warning light illuminated this time, there should be a fault code logged. The trouble with the D3 is that it's so damn complicated that everything affects everything else - example being we had a vehicle in a year or so back where the suspension was flat, the actual problem was a dud ABS sensor but because the vehicle argued with itself about what the vehicle speed was, the suspension then panicked and went flat. In that case it was not too hard to diagnose but if there is nothing stored in the computer its nigh on impossible - however this time there should be if it tripped a warning light.

The only thing I can think of offhand is whether the box thought it was in manual mode and thus would not change up automatically but would do using the lever - though I can't remember offhand how it all works, mercifully there are not too many of them here and most are manuals.

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ok

so I have had a diagnostic run and the only 100% fault that came up was:

p0705 Transmission range sensor circuit malfunction - it requested as a fix a software upgrade ....which didn't work.

Further investigation seems to be that this changing issue may be the above senor - which LR cannot find on the system to replace, so does anyone know where it is and whether it is part of the transmission ECU and valve block or is it situated somewhere else, and if there is an easily replaced part that can be purchased and replaced etc.

LR suggest a full gearbox replacement at £4k the valve block and ECU £1.8k

not really ideal given that is not guaranteed to fix the problem.

Any help or suggestions on this would be helpful, or even a diagram of the position of the Transmission range sensor - to enable us to check the connections etc.

thanks

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I'll try and remember to have a look tomorrow but I'm not sure offhand.

However from the fault code description I suspect it's in or on the transfer box and tells the system whether the vehicle transfer case is in high or low range so if it doesn't know what range it is in then it might panic as various transmission modes will depend on what range the vehicle is in (for example rock crawl can only be selected in low range). Probably what is happening is something like this ... you are pootling up the motorway at say 80mph and then the sensor suddenly tells the vehicle the transfer case has switched to low range at which point the electronics might think "ooo F that means we are about to get 9000rpm on the engine as it will only do 40mph in low range" and get all excited and start lighting up the christmas tree lights and bongs to tell you to slow down before conrods start coming through the bonnet.

Being a Disco 3 it may also be worth you asking the question on the Disco 3 owners forum http://www.disco3.co.uk/forum/ as to be honest the amount of knowledge on LR4x4 is a bit limited on the D3 and there are more owners and techs over there I think with it specialising in that model.

I know the manual transmission gear position sensor had an issue with calibration which was fixed by a software update so this might be the same but I'm afraid my experience on these is a bit limited.

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Hello Sheena,  2005 D3, 2.7, now 315000KM, already 2* changed the turbine. Same symphtons, what was the solution for your car? 

thanks 

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changed the break lamp swich near the break pedal: and all errors are gone. this is the second time this happend I never thought that swich can fall appart in few month. 

also can check the break bulbs...all this can cause crazy error messages and faults.

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Eight year old post so you'll be lucky to get a reply from the OP as they only ever posted 3 times!

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