BMW fault code AA31
Hybrid Interface Module
HIM: Cooling circuit, high-voltage battery, Duo water valve to cooling unit, control faulty
Module version: Hybrid Interface Module (HIM_72)
In: X6 (E72) 2009–2011
Reading and clearing it
Fault code AA31 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)
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