BMW fault code 9C66
Automatic heating/air conditioning
In the automatic heating/air conditioning, code 9C66 means different things depending on the version of the module in the car. Find your car below; the app shows the right one for yours.
IHKA: Internal control-module fault
Module version: Automatic heating/air conditioning (IHKA60)
In: 5 Series (E60) 2003–2010, 5 Series (E61) 2004–2010, 6 Series (E63) 2003–2010, 6 Series (E64) 2004–2010
IHKA: Fogging sensor, supply monitoring
Module version: Automatic heating and air conditioning (IHKA60_2)
In: 5 Series (E60) 2003–2010, 5 Series (E61) 2004–2010, 6 Series (E63) 2003–2010, 6 Series (E64) 2004–2010
IHKA: Heat exchanger sensor, right
Module version: Automatic heating/air conditioning (IHKA65)
In: 7 Series (E65) 2001–2008, 7 Series (E66) 2002–2008, 7 Series (E67) 2002–2008
IHKA: Supply, internal
Module version: Automatic heating/air conditioning (IHKA70)
In: X5 (E70) 2006–2013, X6 (E71) 2008–2014, X6 (E72) 2009–2011
IHKA: Ventilation-flap motor for auxiliary rear A/C, middle right
Module version: Automatic heating/air conditioning (IHKARR)
In: 7 Series (E65) 2001–2008, 7 Series (E67) 2002–2008, 7 Series (E66) 2002–2008
Reading and clearing it
Fault code 9C66 is a BMW code, stored in the car's automatic heating/air conditioning, 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 automatic heating/air conditioning is on: 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72), 1 Series (E81), 1 Series (E82), X1 (E84), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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