If the engine is cold and temperatures are below
approx. 32 ℉/0 ℃, the start process may be de‐
layed somewhat due to automatic preheating.
A Check Control message with yellow in‐
dicator light is displayed.
Depending on the motorization, the full drive
power may not be available for approximately
30 seconds after starting the engine. In this case,
the vehicle will not accelerate as usual.
Display in the instrument cluster
When drive-ready state is switched on, the tach‐
ometer shows the current engine speed.
Switching off drive-ready state
Engage selector lever position P with the ve‐
2. Press the Start/Stop button.
The engine is switched off.
3. Set the parking brake.
Auto Start/Stop function
The Auto Start/Stop function helps save fuel.
The system switches off the engine during a
stop, for instance in traffic congestion or at traffic
lights. Drive-ready state remains switched on.
The engine starts automatically for driving off.
After each engine start using the Start/Stop but‐
ton, the Auto Start/Stop function is ready. The
function is activated from speeds of approx.
3 mph/5 km/h.
Depending on the selected driving mode, refer to
page 137, the system is automatically activated
The engine is switched off automatically during a
stop under the following conditions:
▷ The selector lever is in selector lever position
▷ The brake pedal remains pressed while the
vehicle is stationary or the vehicle is held by
▷ The driver's safety belt is buckled or the driv‐
er's door is closed.
Steptronic transmission: manual
If the engine was not switched off automatically
when the vehicle stopped, the engine can be
switched off manually:
▷ Press the brake pedal forcefully again from
the current pedal position.
▷ Engage selector lever position P.
If all functional preconditions are fulfilled, the en‐
gine switches off.
Air conditioner when the engine is
The air flow from the air conditioner is reduced
when the engine is switched off.
Displays in the instrument cluster
The display in the tachometer in‐
dicates that the Auto Start/Stop
function is ready for an Automatic
Online Edition for Part no. 01402896703 - X/18