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Re: 2001 BMW with fault code 48 stored
Posted to Transmission Forum on 11/23/2008

There is a service bulletine out for this code, SIB 24 08 00 Read the P-codes first as there are 3 related to factory code 48 in the GS20 controller.

48 P0740 Torque Converter Clutch Circuit/Open TCC Solenoid faulty

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