BMW fault code C91A
Junction Box electronics
In the junction box electronics, code C91A 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.
Message (water valve, 0x1B6) faulty, receiver JBE, transmitter DME-DDE/IHKA
Module version: Junction Box electronics (JBBF70)
In: 1 Series (E87) 2004–2011, 1 Series (E82) 2007–2013, 1 Series (E81) 2007–2011, 1 Series (E88) 2008–2013, 3 Series (E90) 2005–2012, 3 Series (E91) 2005–2012, 3 Series (E92) 2006–2013, 3 Series (E93) 2007–2013, X1 (E84) 2009–2015, X5 (E70) 2006–2013, X6 (E71) 2008–2014, X6 (E72) 2009–2011, Z4 (E89) 2009–2016
No message from IHKA, receiver JBE, transmitter DME-DDE/IHKA
Module version: Junction Box electronics (JBBF87)
In: 1 Series (E87) 2004–2011, 3 Series (E91) 2005–2012, 3 Series (E90) 2005–2012, 3 Series (E92) 2006–2013, 3 Series (E93) 2007–2013
Message (seat heating, front passenger) incorrect, receiver JBE, transmitter IHKA/IHKS/IHS
Module version: Junction Box Electronics (SPEG56)
Which BMWs have this version depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
Reading and clearing it
Fault code C91A is a BMW code, stored in the car's junction box electronics, 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 junction box electronics 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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