UPDATE: Changed the battery with the Exide spare that was in the charger.im getting the same voltage as with the other one.

Car fired up okay but died after about 2 min of idling..

On top of the CEL I got 4x4 light on as well.

I hear a whining noise towards the rear wheel well of the car...

Gotta drive it to the mechanic to read the codes but I'm afraid it'll die by itself at 60mph ...

Edit: the mechanic will get to scan it tomorrow morning the soonest...I just got it scanned with a cheap oreilly's scanner and it gives me P1720.
no other description...

Tried to erase the code and it came right back ..

Bump
P1720 129 CAN Timeout Control Module
Anyone had this problem before?

Doing a little digging on that code and it seems once people mention it the thread dies.

This thread is kind of interesting. Post #10 in particular.
Transmission Failsafe Program! help, bmw x5 4.4i 2002,

Good read! Will have to start checking every wire in sight.
Tomorrow at 9am I'm scheduled to hook it up to the real software.Will see if it gives us something to start on.Not getting irritated yet...still got some patience.

CAN timeout is generally a failure on the CAN bus network ( the network all of various systems uses to communicate ). sounds like wiring... has it ever been in a wreck?

Mysterious electrical issues, I wonder about your grounding wires, both from batt to car frame and from engine to frame. Purely a guess, not based on anything specific to X.

Gluck here

UPDATE:
Brought it to the shop, they diagnosed it and it's the ABS Module on it's way out.
Cost:620$ parts and labor with a remanufactured Bosch unit- 9 month warranty
Is it worth it?or are they asking too much?
What should I do?i need to know ASAP so I can have it fixed in about 2hrs or so

I know they can be sent out to repair but not sure on the cost.
And if I have them change it, is it worth it to fix mine as well and sell it afterwards or just scrap it?

BMW ABS Modulator (X5) - Bosch 1265916803

Brand:http://dyw03owr7vs3n.cloudfront.net/...361ad21a7d.gifBoschSKU #:1265916803Part:ABS ModulatorOE Numbers:1265916803, 1265916803, 55006002101, 34526773015, 147036FCP ID:147036$642.95

Bosch New

BMW OE is $1200

so im guessing its a good deal.