Hi guys. So recently I've been having a large amount of issues with my car. Most recently started when my cranking speed seemed like it kept going slower then eventually just wouldn't start. Wouldn't even try to crank over. As soon as I tried to turn it to the on position it'd just turn off (Acc worked fine though). Replaced the battery, and it started showing the VSC, slip, ABS, AWD, and brake lights on and off, as well as feeling like the transmission kept slamming in and out of gear. Speedometer would also continuously die and come back. Noticed some corrosion on the battery terminal and cleaned it and it was fine for a few more days. Now it's doing the same thing again much more frequently and getting worse. Interior lights flickering, radio cuts in and out, etc. Tested the alternator and it says it's charging normally but since the issue is very intermittent I'm wondering if the voltage regulator is going out. Any help would be very much appreciated!

 

Have you checked for codes? Water around the BCM/ECM?
https://www.myg37.com/forums/general...-problems.html

 

no water damage or signs of leaking. But basically every single electrical code you can think of is showing up lol. Nothing in a single category

 

With the corrosion on the battery terminal you noticed, cleaning it may not be enough. Have you considered simply replacing both sides?

 

I haven't, but thatll definitely be the next step. Btw, codes showing up are

P1550:
B1023
P0443
P1815
C1109
U1300
U1129
U1240
U1243
U125C
B260A
B261A
C1706