Has your gearbox had the software updates available through SDD diagnostics ? or try to reset Adaptations, you could also try doing a hard reset by disconnecting battery for a few minutes and touching terminals together

I've done two atf fluid changes at 105k and 130k but no software update. Haldex also feels like it needs a service so not sure if that's an issue? The hesitation seems to coincidence with the noise the haldex makes when pulling away, three or four short bursts of a sort of scuffing noise.

you could take the prop of and see if it makes any difference, trouble is noises can confuse you and throw red herrings sometimes.

Tempted to pull the haldex fuse and see if that works

oops I meant to say that as well give it a try

has this fault not been mentioned before?With the cure being a software problem.

Autobox software?

The software update is supposed to stop the clunk when putting it into drive isnt it? Not a hesitant throttle?

Hi all....

My car is a 2011 SD4 XS....111000 miles

The full symptoms are as follows ...

Car runs fine but when stationary at a junction, gearbox in drive and car held on brake, when you press the accelerator to move off nothing happens apart from the car moving forward very slowly (as it would if you lifted off the footbrake only).

Reverse works fine and command shift won't work either. You can press the accelerator to the floor and ther are no extra revs, just idle.

I parked up and returned a few hours later and all was back to normal.

Hope this makes sense.

Ps....carpets are not stuck under accelerator!!

That's exactly the symptoms I have but it only lasts 5 to 10 secs then returns to normal. Neen happening once or twice a day, then I changed the crank sensor and it's gone to chugging almost stalling rather than no throttle response at all.

Are you sure it’s not one of the sensors on the throttle pedal? Fly by wire controls that are fitted don’t have a physical connection between pedal and fuel pump, just an electrical circuit controlled by computer chips, with inputs and feedback loops. Your foot might have commanded increased engine speed but do you know that the signal got to the fuel system?

No idea, can the pedal unit be checked? New unit from LR is about 260 ish, so a bit pricey just to try it. Could always get one from a breakers I suppose

You’d need an OBD device see outputs from the throttle sensors and compare demanded and actual fuel rail pressure to compare what was asked for and what was given.

I've got a cheap obd dingle and car scanner pro app but not a proper code reader. I'm assuming it will only show a problem when the fault occurs, so not easy to diagnose when the fault isn't occurring.

Needs a data logging type set up for a few days to see what is happening

CarScanner can do data logging, you just have to connect up your phone and remember to disconnect again at the end of the journey. Not certain it will log demanded verses actual throttle positions or fuel rail pressures but it does give instantaneous readings as graphs.

Openroad515 wrote:

Hi all....

My car is a 2011 SD4 XS....111000 miles

The full symptoms are as follows ...

Car runs fine but when stationary at a junction, gearbox in drive and car held on brake, when you press the accelerator to move off nothing happens apart from the car moving forward very slowly (as it would if you lifted off the footbrake only).

Reverse works fine and command shift won't work either. You can press the accelerator to the floor and ther are no extra revs, just idle.

I parked up and returned a few hours later and all was back to normal.

Hope this makes sense.

Ps....carpets are not stuck under accelerator!!