Possible reasons for the automatic transmission going into emergency mode in the Peugeot 308:
Electrical problems:
* Failure of the speed sensors of the input and output shafts of the gearbox
* Damage to electrical wiring
* Malfunction of the automatic transmission control unit
* Problems with the battery or charging system
Mechanical problems:
*Lack or leak of transmission fluid
* Wear of clutch friction discs
* Damage to valve body
* Mechanical failure inside the automatic transmission
Other reasons:
* Automatic transmission overheating (for example, due to slipping)
* Incorrect maintenance or use of inappropriate transmission fluid
* Engine cooling system malfunction
* Errors in the vehicle’s electronic control unit (ECU)
Emergency mode symptoms:
* Jerks and jolts when changing gears
*Loss of traction or power
* Limitation of the number of gears available for switching
* The transmission fault indicator on the dashboard lights up
* Appearance of error codes during diagnostics