Hello all, new rover owner here.

I just picked up this decently clean 2006, and I wanted to check the differential fluids before a trip this weekend. First let me start off by saying I am mechanically inclined, but that doesn’t mean I’m perfect, or familiar with something new.

On the rear diff, to the driver side of the pinion there is a long “nut” that is spring loaded.

I mistook this for the differential fill plug.
And after filming I got a “transmission fault, traction reduced” error.

Could it be the fact that I most likely over filled it, or is it because I removed that spring loaded pin/nut assembly?

Thank you.

Is it the active differential (the one that can lock)? That has motor on top. No motor then not active. The active diff uses a different oil to the open diff.

The nut you removed. Was it very big and long? If so, that sounds like a mass damper. There is one on the front face of the active diff.

Or did the nut have a wire running to it and was situated above/in a U shaped guard? That's the oil temperature sensor. If there's a problem with that then the ECU might decide it's overheating and so give the warning because it thinks it can't lock the diff. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Any chance the part circled is the part you are referring to as having removed?




Cheers
Col

Col, yes that is the part I removed, and filled the diff up to that point.

RRSTDV8 wrote:

Is it the active differential (the one that can lock)? That has motor on top. No motor then not active. The active diff uses a different oil to the open diff.

The nut you removed. Was it very big and long? If so, that sounds like a mass damper. There is one on the front face of the active diff.

Or did the nut have a wire running to it and was situated above/in a U shaped guard? That's the oil temperature sensor. If there's a problem with that then the ECU might decide it's overheating and so give the warning because it thinks it can't lock the diff.

Col wrote:

Any chance the part circled is the part you are referring to as having removed?




Cheers
Col

From the official Workshop Manual..........

Click image to enlarge

I fixed the issue.

I did drain out the excess fluid, but the fault was still present.

Then what ended up happening is I decided to remove the hexagonal plug/pin again and have a look inside.
Inside that hole there is a “collar” that spins around. If you pay close attention you will spin it enough and see that it ramps up going either way. In the middle of these little ramps with square faces is a machined notch. I simply lined that back up with the hole and put the plunger pin in it, then tightened it back up and the fault immediately cleared itself on key up.