4WD AWD DTC DISABLED // TRANSMISSION MALFUNCTION

[Leo e70]

I have an 08 4.8l with 133k. Was on the freeway yesterday in 5th gear and out of nowhere my AWD 4X4 DTC lights came on as well as my brake light. The car seemed to be a little more unstable than usual (assuming the stability control was malfunctioning). As i let off the gas and made my way to an exit my transmission gear light came on and a transmission malfunction message came on. I pulled off the freeway and was stuck in 5th gear which made me accelerate like a snail at lights. Found a parking spot where I had to leave in an uber to a meeting so i didnt try starting it until 3 hours later.

Bottom Line

I came back thinking my x5 was done for. The battery surcharge light was on and started rough on first go. Looks like it was only battery issues that caused malfunctions. Anyone have any reputable batteries they recommend. I have an aftermarket sound system which pulls more energy from battery.

[blue dragon]

Once the car is running, its the alternator that powers things, and if your battery light is on, I would say your alternator is not charging it.
Diagnosis, possible bad alternator

[euge]

Leo, does your X5 have rear climate control? If it does you have a 220 amp alternator, which should be enough to power your aftermarket system. Also, after all these messages appear, are they still present after turning the car on/off?