BMW fault code CF4B
Transfer case
In the transfer case, code CF4B 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.
VTG: PT-CAN communication fault
Module versions: Transfer box (VGSG70), Transfer box (VGSG90)
In: 3 Series (E90) 2005–2012, 3 Series (E91) 2005–2012, 3 Series (E92) 2006–2013, 5 Series (E60) 2003–2010, 5 Series (E61) 2004–2010, X1 (E84) 2009–2015, X5 (E70) 2006–2013, X6 (E71) 2008–2014, X6 (E72) 2009–2011
VTG, PT-CAN: communication fault
Module version: Transfer box (LMV_84)
In: 3 Series (E90) 2005–2012, 3 Series (E91) 2005–2012, 3 Series (E92) 2006–2013, X1 (E84) 2009–2015, X5 (E70) 2006–2013, X6 (E71) 2008–2014, X6 (E72) 2009–2011
Reading and clearing it
Fault code CF4B is a BMW code, stored in the car's transfer case, 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 transfer case is on: X5 (E53), 5 Series (E60), 5 Series (E61), X5 (E70), X6 (E71), X6 (E72), X3 (E83), X1 (E84), 3 Series (E90), 3 Series (E91), 3 Series (E92)
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