Hi All,

My cars started coming up with a TRANS FAILSAFE PROG from time to time. Now what I find interesting about this is other than the car driving along as if it's slipping the clutch all the time (tq converter disabled?) it drives normally - goes up and down through the gears fine, and if I knock it across into manual mode I can go up and down through the gears without problem.

For the sake of completeness the car has had a strange issue since I got it - When I knock it across into manual mode instead of telling me I've gone into 'sport' mode, it lights up the 'Low' mountain. When I then go to change a gear instead of telling me I'm in manual mode it just shows the number of the gear I'm in, along with the low range mountain. Additionally when I put the car into low range it doesn't ask me to select neutral, it just waits until I've done so, and then the Low range mountain doesn't flash but you can hear the motor do something and when you drive off its quite clearly in low range, made obvious by the revs!!

Is it at all possible that these faults are related? I've read some things about the potentiometer on the transfer box motor... Could this be at fault? Or perhaps some kind of transmission ECU? I can't find anything quite like it having scoured the internet so I'm at a loss as to where to begin fault finding!!

From a gearbox point of view, its the only one I've driven so can't compare it to anything other than the L405 which i'm sure is completely different by design, but I think to me the gear changes feel ok. Perhaps a little clunky when cold but I've read that this is normal. Also possibly a tiny delay going from D to R and back again, but again I'd say this is only when cold, and doesn't clunk or anything just a small delay, half a second or so?

I had the car scanned today just after the TRANS FAILSAFE PROG came up, as I was on my way to my friends workshop anyway, and it said 'Mechanical Torque Converter Monitor Fault'

Not sure what this means and not sure I like the sound of it either

Hope someone can help!
Cheers
Matt

Hi,

If you fill in the car details on your profile then we will know what model you are talking about...... Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Sounds like your transfer box motor is working OK, if you are able to get into and out of low range alright.

When in manual mode it will tell you the number of the gear you are in. You are not in sport mode so it won't tell you you are. Could be you are doing a double when pushing the lever across, this is why sport does not come up?

Not sure about the "low mountain sign" though, does sound like a gremlin.

Battery disconnect procedure??

All that said, with a slipping box (have you checked the oil level in the box?) I fear the worst is to come...  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Sorry will update details now, it's an 03 TD6 vogue

What should I need to do to make it say sport mode then? Will try disconnecting battery for a while in the morning

You still need to put your car details in your profile mate. You will then have a little car icon under your avatar....

Moving the lever left and nothing more is sport mode.

Moving it backwards or forwards once there engages manual mode.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

I thought that was the case. So on my car putting into sport mode makes the low range mountain light up, then when I move up or down to enter manual mode it makes the mountain a little brighter! No messages displayed on the screen for either.

The gearbox only slips when the trans failsafe prog message is displayed, I thought I'd read this was because it deactivates the torque converter?

Does it only go into 4th and hold it there if it's a certain issue? As mines never ever done that!