BMW fault code AA37
Hybrid Interface Module
Second 12V battery: undervoltage
Module version: Hybrid Interface Module (HIM_72)
In: X6 (E72) 2009–2011
Reading and clearing it
Fault code AA37 is a BMW code, stored in the car's hybrid interface module, not a generic OBD2 code (P0xxx): a generic OBD2 reader only reaches the engine's emissions faults, so it won't show it. AutoLingo for BMW reads it with BMW's own diagnostic protocols, in plain English, with the details the module stored about it, and clears it after a repair. If a fault comes right back after it's cleared, the problem is still there.
The hybrid interface module is on: X6 (E72)
Coming soon
Enter your email address to hear when AutoLingo for BMW is ready.