This has me totally at a loss. No problems until i went to start one morning. Hit the start button and engine will not turn over. and got transmission fault, CATS system fault, ABS fault, DSC not available, brake fluid low, and parking brake fault. The parking brake warning keeps going even after shut down.
ODB shows
U0103-00 lost communication with gear shift module,
U0101-00 lost communication with Transmission control module.
U0121-00 lost communication with ABS control module.
U0402-08 invalid data received from transmission control module.
P0500-82 vehicle spend sensor.
The battery is 3 months old and fully charged, I have done the battery pos-neg tap, visually checked for lose connectors, replaced the ignition R-7 relay.
Any and all ideas will be appreciated.
Thank you

 

All of that points towards a bad battery. Yes, you stated it is new and fully charged........ but IS IT? Voltage measured directly at the battery posts should be no lower than 12.6 volts after several hours of sitting.
So, going from your lists of problems, either your entire car is messed up, or the battery is low.
Remove the variable, have your battery load tested.

 

Same thing happened to me with new battery and several times after , would drain itself over night every so often for no reason that I could find. Got a maintainer and no issues since.

 

Okay, I tested the battery and its reading 12.6V. I charged it for 12 hours last night. I connected an external jumper pack as well and it made no change. I also just tested voltage to ignition relay and it is good. I agree the car is really messed up at this time, I have never seen this many faults at one time, I still love the car and I look forward to driving it again.

 

Try boosting from another car, if it starts and the flashing lights go away its the battery or something to do with it.

 

Tried jumping from my Ram pickup which has heavy duty charging system. No change.

Also of note is that even after I turn off ignition the parking warning alarm continues until I disconnect the battery and does not start again when I hook the battery back up.

 

Have you checked all the ground points? Those get crappy sometimes and create faults.
I don't know where they are, but people in here do know.

 

inspect for water, this smells of water got into the wrong place.

 

Next step in the WTF? Jag diagnosis is to do a hard reset. Disconnect both battery leads and hold them together for 30 seconds or so (unless that's what you mean by "I have done the battery pos-neg tap")
.
Then try to start.

Let us know.

 

i have not tired the hard reset. I only touched the terminals for a few seconds. I will try that in the morning and let you know.

I live in New Mexico so there is no rust and very little rain but I agree it sounds like I have lost a ground somewhere. I also keep the car covered when not in use. It my be a cold contact that checks good but shorts under load. Rare but I have seen this when working on aircraft avionics.
Not sure if the ECM could cause this.

 

Do you have a dongle plugged into your OBDII port? If so, unplug it. That can cause the dashboard to go bonkers with warning lights.

 

This!

 

I only plug the OBD in when I am troubleshooting

 

The irony, now my car wont start aftet replying

 

WOW, sorry to send the bad karma your way. I hope that yours is a simple problem.
I have tired the hard reset with no change of problem.
I have now checked as many of the grounds as I can find with all being good.
I even threw in a new Duracell AGM battery with no change.

I am completely at a lose at this time, I am even considering having it towed to the jaguar dealership.

 

Okay then, disregarding all the faults, do your brake lights illuminate when you press the brake pedal while trying to start? Maybe your BRAKE APPLIED switch doesn't work, and the faults are otherwise.

 

Its something simple yet elusive, you just have to find it. Assuming the battery is good and the grounds are good......mice damage? Its gotta be something like a bad module or broken wire.

 

Funny you should mention mice damage. Mice made a nest in my daughters BMW and used the wiring to make it, $4,600 to have it repaired, luckily insurance paid for most of the damage. Checking for mice damage was the first thing that I did.

I have spent the day reviewing wiring diagrams and will start chasing wires and fuses in the morning. I think the problem may be a CAN high speed bus communication problem. I found an old aftermarket audio box with wiring near the high speed bus

 

We live in the hills at the old house in Ca. Mice got the wifes old XJ (found and fixed by me), and my 911 where they chewed through a high pressure fuel line....$4k. They also got a small wire way inside the side rails of my old Range Rover that caused the suspension to go flat. Local shop Yorks and Lancs printed me out a bunch of diagrams with pictures on where to look. Found it in 5 minutes and fixed it pronto. Point is, a module or mice is the first thing that popped into my head after you confirmed good voltage and good ground. Keep us posted!

 

I shall ask AGAIN; Do your brake lights illuminate when you press the brake pedal???