BMW fault code D204
Soft top module
In the soft top module, code D204 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.
Physical bus error
Module versions: Convertible top module (CTM_93_5), Soft top module (CTM_93_6), Convertible top module (CVM_88_2)
In: 1 Series (E88) 2008–2013, 3 Series (E93) 2007–2013
CTM: K-CAN wire fault
Module version: Soft top module (CTM_89)
In: Z4 (E89) 2009–2016
CVM: K-CAN Line fault
Module version: Soft top module (CVM_64)
In: 6 Series (E64) 2004–2010
Reading and clearing it
Fault code D204 is a BMW code, stored in the car's soft top 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 soft top module is on: 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), X1 (E84), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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