What does gearbox fault mean in my 2004 jagar All Wheel Drive?

"sheilagardner585  we would need to know the exact model of your Jaguar. This could be a oil issue as well as a TCM issue and many other things. If you need to change the oil for your gearbox, the drain plug is located near the passenger side differential.The refill plug is located under the battery housing near the water pump.  Total oil volume is between 3.5-4 quarts ,

If you can, have your car scanned and see what codes it gives you. The X-series has issues with moisture buildup in the TCM and a corroded connector. You can check that connector and clean it. The TCM is located under the dash on the passenger side. Again this is for the X-type Jaguar."