BMW fault code CF21
Transmission control
In the transmission control, code CF21 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 (raw data for longitudinal acceleration) from DSC incorrect, receiver DCT/EGS, transmitter DSC/KOMBI
Module version: Transmission control (DKG_90)
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.
Invalid Data Received from Bedienung transmission selector switch
Module version: Transmission control (GS1912)
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.
No message from the KOMBI, receiver DCT/EGS, transmitter DSC/KOMBI
Module version: Transmission control (GS19B)
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.
Message (status, DSC) not current, transmitter DSC, receiver EGS
Module version: Transmission control (GSF21A)
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.
No message from KOMBI, receiver EGS, transmitter KOMBI
Module version: Transmission control (SSG_60)
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 CF21 is a BMW code, stored in the car's transmission control, 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 transmission control is on: X5 (E53), 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), X3 (E83), X1 (E84), Z4 (E85), Z4 (E86), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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