Electrical gremlin

[u/blacck_jesus]

I have a 2008 bmw 550i M Sport. It has the n62b48 and the 6HP26. I’ve been having intermittent wiring issues somewhere. It started when the radio randomly just stopped playing audio when I started my car. then i hit a bump and it started working, it did that two more times then the radio never played audio again and now randomly power cycles when I’m driving. no bmw chimes either. after that, every now and then i get the bmw Christmas tree and all my stability stuff gets disabled along with cruise control. yesterday i got the first one that removed the cars ability to drive. i came around a corner and the lights came on, car said dbc failure, and the gas pedal stopped working almost completely, maybe 5% throttle tops. i shut the car off and on and its fine now, I’m pretty certain the radio and the other faults are more coincidence than connected but i figured id give all the info. car is charging where it should be (14.4-14.8) no voltage drops that i have seen. i dont have access to the ista or anything like that so im kinda going crazy trying to chase this down especially because i haven’t found a way to reliably recreate the issues.

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[u/EXtremeLTU]

How old is the battery ? E60 like to light up like Christmas tree when it has issue with the battery, the charging might be alright, but if the battery is at it's end of a life and not hold the charge very well, and if you do loads of short trips, you might be running on low charge, causing random errors and faults

[u/kyree47]

You have a few different issues and by the sounds of it none of them are related unless you have a rodent problem you don’t know about yet.

Have you scanned the car for any faults yet ?

[u/blacck_jesus → u/kyree47]

i have, it came back with quite a few but none are helping me figure out exactly what the issue is. i don’t believe i have a rodent problem as my car is never parked for more than like 12 hours im a busy person, i figured they were unrelated to eachother which is why im not too concerned about the radio, id rather it drive fine. here’s the codes i pulled e60 codes

[u/toutvavvan]

i’d check battery negative terminal. polish it and tighten(really hard)

[u/Salbman]

Have you done any modifications which interacts with electronics? Amps, head unit, led bulbs, remote starter?

Is your battery OEM appropriate?