BMW fault code 01D89A
Hybrid DC/DC converter
APM: No message from hybrid master control module (HCP)
Module version: Hybrid DC/DC converter (APM_72)
In: X6 (E72) 2009–2011
Reading and clearing it
Fault code 01D89A is a BMW code, stored in the car's hybrid dc/dc converter, 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 dc/dc converter is on: X6 (E72)
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