BMW fault code 004B
Convertible-top module
In the convertible-top module, code 004B 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: Short between valve, retract clamping bracket, and valve, main pillar
Module version: Convertible-top module (CVM_II)
In: 3 Series (E46) 1998–2006
Outputs V4SBA and V2_HAUPT connected by short circuit
Module version: Convertible-top module (CVM_III)
In: Z8 (E52) 2000–2003
Reading and clearing it
Fault code 004B 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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