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- Fig. 1 Instrument cluster: Engine stop temporarily unavailable
Applies to vehicles: with start/stop system
The on-board control system can override the start/stop function for various reasons.
Engine does not switch off
Before each stop phase, the system checks that certain conditions have been met. The engine will not switch off in the following situations, for example.
- The engine has not yet reached the minimum temperature required for start/stop mode.
- The interior temperature selected on the air conditioner* has not yet been reached.
- The exterior temperature is very high/low.
- The windscreen is being defrosted Link (applies to vehicles with automatic air conditioner).
- The parking aid* is switched on.
- The battery charge is too low.
- The steering wheel is close to full lock or the vehicle is being steered.
- Reverse gear has just been selected.
- The vehicle is on a steep gradient.
will appear in the instrument cluster display, and 
will simultaneously appear in the driver information system*
.
Engine cuts in again automatically
The stop phase is interrupted in the following situations, for example. The engine cuts in automatically without intervention from the driver.
- The vehicle starts to roll (e.g. on a hill).
- The interior temperature deviates from the air conditioner* setting (applies to vehicles with air conditioner).
- The windscreen is being defrosted Link (applies to vehicles with automatic air conditioner).
- The brake pedal is pressed several times in succession.
- The battery charge drops to an insufficient level.
- The power consumption is high.
Note
- If you select D, N or S after selecting reverse gear on a vehicle with automatic gearbox, the car must have been moving at over 10 km/h before the system can switch off the engine again.
- In colder weather, it may take some time before the start/stop system can be used due to the increased load on the battery.