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Emergency Default Mode, Function - GF27.60-P-3012ANF

Transmission 725.0 in MODEL 166 

Function requirements for limp-home mode, general 

Limp-home mode, general 

In order to guarantee a safe driving condition and to avoid damage to the automatic transmission, the fully integrated Transmission control unit (Y3/8n4) switches to limp-home mode in the event of critical faults. In the case of solenoid faults, the affected gear is blocked and no longer actuated. As a result the vehicle can be brought to the nearest Mercedes-Benz service operation.

  Overview of system components for automatic Transmission (AT) Transmission 725.0 in MODEL 166 (except 166.006) GF27.10-P-9992ANF
  Overview of system components for automatic Transmission (AT) Transmission 725.0 in MODEL 166.006 GF27.10-P-9992ANK