Freespaña,
Sorry, in my ignorance I forgot to mention when the fault originally displayed I stopped and restarted the engine a couple of times but the fault continued to display. The thing is, if I change the pump and the problem recurs, then I’ll need to change the haldex which comes with a new pump, I have a dilemma.
After reading your and Nodge68 responses I consulted an independent LR gearbox etc specialist who agreed with both diagnoses but recommended seeing if it was just a low battery prior to getting involved in replacing pumps/ haldex units. I’m not aware of any problems with the battery but think, given the cost disparity it’s worth giving that a go first.
Thanks to you both for your much appreciated advice.
Fingers crosssed!