BMW fault code 011B21
Hybrid master control module
HCP: Implausibility between dynamic loss torque and HCP-internally calculated loss torque
Module version: Hybrid master control module (HCP_72)
In: X6 (E72) 2009–2011
Reading and clearing it
Fault code 011B21 is a BMW code, stored in the car's hybrid master control 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 master control module is on: X6 (E72)
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