BMW fault code 0003
Convertible-top module
In the convertible-top module, code 0003 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.
CVM: Control-module fault, internal memory (checksum error ROM)
Module version: Convertible-top module (CVM_II)
In: 3 Series (E46) 1998–2006
CVM: Control-module fault: internal memory (checksum error ROM)
Module version: Convertible-top module (CVM_III)
In: Z8 (E52) 2000–2003
CVM: Control module (checksum error ROM)
Module version: Convertible-top module (CVM_IV)
In: Z4 (E85) 2002–2008
Reading and clearing it
Fault code 0003 is a BMW code, stored in the car's convertible-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 convertible-top module is on: 3 Series (E46), Z8 (E52), Z4 (E85), Z4 (E86)
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