Possible reasons for automatic transmission emergency mode in Mercedes W203:
Mechanical faults:
* Slipping or wear of clutch friction discs
* Mechanical damage to the gearbox
*Hydraulic pump malfunction
*Transmission fluid leaks
Electrical and electronic faults:
* Transmission speed sensor malfunction
* Malfunction of automatic transmission pressure sensor
* Damage to wiring harness
* Malfunction of the automatic transmission control unit (TCU)
Other reasons:
* Insufficient transmission fluid level
* Contaminated transmission fluid
* Clogged gearbox oil filter
* Transmission overheating
Symptoms of automatic transmission emergency mode:
* The transmission only shifts to lower gears
* Gears do not shift or shift late
*Loss of engine power
* Jerks and shocks when changing gears
*The warning indicator on the dashboard lights up
Actions in case of automatic transmission emergency mode:
* Stop in a safe place and turn off the engine.
* Check the transmission fluid level and add it if necessary.
* If the fluid level is normal, call a tow truck and take the car to a specialized workshop for diagnostics.
Note:
Operating a vehicle in emergency automatic transmission mode can lead to serious damage to the gearbox and other expensive repairs. It is not recommended to try to continue driving in emergency mode.