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

Transmission 725.0 (except 725.096) in model 257, 290 

up to model year 2021 

Function requirements for limp-home mode, general 

• Combustion engine running

Limp-home mode, general 

In order to guarantee a safe driving condition and to avoid damage to the automatic transmission, the control unit for the fully integrated transmission control electric controller 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. The driver can therefore drive the vehicle to the nearest Mercedes-Benz service operation.