Any chance somebody has ever experienced these codes? Don't mind the code for secondary battery, as I (along with many others) have had that battery disconnected without issues for months.

The codes shown are all able to be cleared just fine but come back after a few days. Didn't have any symptoms till last week. What happened was, while driving, I got a "blindspot monitor error" message on the dash. Didn't think anything of it until the steering wheel became hard to turn, the radio, AC controls, backup camera all stopped working as well. Windows wouldn't work, seat adjustments, nothing! Even dynamic mode wouldn't activate!

I then shut the engine and tried to start it again and it wouldn't! "No key detected". Even tried my second key and still the same message. Disconnected negative battery terminal, reconnected, and all was fine. Scanned for codes immediately after (first pic attached below).

I've read on the forums about corrosion in the connectors to the fuse box behind the rear seat-back (aka BCM? or Junction Box?) So I may start by cleaning those connectors. It may also just be a bad BCM/Junction Box? Not sure if that even IS the BCM or the Junction Box or the Gateway Module... Jaguar's diagnostics info is so jumbled and all over the place, it's frustrating. I have since cleared the codes and have not had another instance of this problem. However I scanned the car today and found that some of these codes have come back (not all of them though). Still haven't had any more issues luckily. But I need to find a resolution soon. It's bound to leave me stranded at the most inconvenient time! Thanks

PS: I have completed the network integrity test using SDD and it completed successfully without issues.






Edit: this is a 2013 XJ Supercharged. US-spec. Left hand drive.

 

I hate to say it but with those massive problems (Especially all the U codes) the first question should ALWAYS be.
How old is the battery?
What is the resting voltage of the car after sitting all night?
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I actually replaced the battery last month after I had found that the previous owner installed a non-AGM one. Replaced with an AGM style and performed the reset via SDD. Resting voltage after sitting all night is approx 12.6V. Alternator seems to be charging just fine, however that doesn't mean that there isn't some kind of intermittent voltage spike. I do have a slight oil leak from the timing cover that I will be addressing shortly, so I am thinking it could be shorting out the alternator internally causing these issues I am seeing.

Something else I should have added - the day I experienced these electrical gremlins while driving, it had actually rained most of the day. Are there any common spots for water to accumulate? I already checked the trunk and the engine compartment where the fuse box and brake booster are located. No signs of water.

I should also add - ever since I purchased the car (roughly 8 months ago), my glovebox will randomly open while driving. Sometimes just once. Sometimes it will just keep opening over and over again. It seems to be worse with the heat blowing. But looking at wiring diagrams, the glovebox release switch is controlled directly by the Junction Box. So maybe that is related.

Also sometimes my trunk will not close using the button, I have to manually close it and then it'll work automatically again.

And just yesterday I had a backup camera malfunction. Wouldn't pop up and showed some error message about visiting the dealership. Parking sensors wouldn't work either. But everything else was working fine. Weird

 

Good troubleshooting and I think you have laid to rest any battery problems.
Can you check the CAN bus for proper resistance? With so many network errors it's hard to believe you have that many problems with the car or it's components. But some kind of net work wiring issue would explain it.
I have not done this so don't know what wires to check. Does the network integrity test tell you the Can Bus is OK?

Water is usually found in the trunk or under the front seats if you have a leak.
Does SDD have any indications of voltage variations?

With the module configuration errors listed have you programmed or tried to program any modules?
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Alright I tested the CAN hi and CAN low pins at the OBD-2 port. I'm pretty sure this is the high-speed CAN. Anyway, it tested at 59.7 Ohms with all electrics asleep, which I think is within spec. I still need to find a good place to test the medium speed CAN. That will be next. Network integrity passes just fine, no faults there. I'll need to watch live values and see if there are any voltage issues.

PS: I ordered an HPtuners dongle to tune my 8 speed ZF. HPtuners now fully supports my X351 XJ as of today actually, however when trying to read the tune from the TCU, it still fails. They basically told me it's a communication issue. I am positive these fault codes I am getting and these symptoms I am experiencing are causing this issue with HPtuners as well.

From HPtuners...
Engineering was able to add this OS to our
database. Please download the latest version of
VCM Suite Beta & attempt to read again. HP
Tuners Software Downloads - HP Tuners

As previously mentioned, the x7f error may be an
indication of a vehicle related issue, but you can
try the following if the initial read attempt fails,
1) check voltage, turn off all unnecessary power-
drawing devices in the vehicle (radio, AC, etc.),
and try to read again
2) verify that there aren't any wiring or other CAN
communications issues

If you continue having issues, you may need to
try flashing all controllers to stock and try reading
again.

After verification of voltages in SDD, I will try and disconnect different modules one by one and attempt to read the TCU tune using HPtuners after each one. I think this may help me find the issue. I have already started with unplugging the ABS module and trying again, however HPtuners still fails to read.

EDIT: As far as the module configuration fault codes go, no I haven't attempted to program any module as I am nervous about bricking anything

I am certain I'll figure this out...eventually that is... it will just take some time. Thanks!

 

Good troubleshooting, please keep us updated. I'm seeing a few of these permanent DTCs from your list but the only physical manifestation of that so far, is that my reverse lights and dashboard illumination brightness control are inoperable.