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Auto Start Stop Function
When the vehicle stops, e.g. at a traffic light or in a
traffic jam, the engine automatically stops, pro-
vided all the requirements for the auto stop func-
tion are met. In addition, the engine can also stop
automatically when the vehicle stops while moving
at walking speed. In this way, the automatic Start/
Stop function helps to save fuel.
The ignition remains on, even when the engine is
stopped automatically. All safety functions contin-
ue to operate.
Prerequisites for the auto engine
stop
b b Auto Start/Stop function switched on.
b b Hood closed.
b b Brake pedal pressed.
b b PDK operating mode D, M, N or P selected.
b b Engine, transmission and air conditioning have
reached operating temperature.
b b The vehicle has traveled at least at walking
speed since the last automatic engine stop.
b b Driver's seat belt fastened or driver's door
closed.
Auto Stop and Auto Start
Auto Stop
1. Brake the vehicle with the footbrake.
2. Press and hold the footbrake.
– or –
e Press the P button on the selector lever when
the vehicle is stationary.
Information
The HOLD function can be activated by quickly
flooring the pressed brake pedal while the vehicle
is stationary. This keeps Auto Stop activated with-
out the brake pedal having to be pressed
continuously.
> Please see chapter "HOLD function: Standstill
management" on page 119.
The engine starts automatically when the acceler-
ator pedal is pressed or if the engine needs to be
started.
Information
When adaptive cruise control (ACC) is switched on,
the engine stops automatically when the vehicle is
stationary if the vehicle in front also has also come
to a standstill.
The vehicle is held in a stationary position by the
HOLD function.
Engine start
b b Operating mode D, M, N or P selected.
e Release the footbrake (not in operating mode
P).
– or –
e Press the accelerator pedal.
– or –
e Move the steering wheel.
– or –
e Select R operating mode.
You can move off as normal.
A A u u t t o o S S t t a a r r t t S S t t o o p p F F u u n n c c t t i i o o n n
Information
In certain situations, the engine is started auto-
matically, e.g., if the vehicle is rolling forward or in
order to maintain a comfortable temperature.
Information
If the adaptive cruise control (ACC) is active, the
engine starts automatically when the vehicle in
front moves off again.
Reaction after leaving the vehicle
After leaving the vehicle after the engine has stop-
ped automatically (driver-side seat belt unfas-
tened, driver's door opened and brake pedal
released), the engine will not start automati-
cally. Additionally, in modes D, R or M:
– The electric parking brake is engaged.Please
see chapter "Brakes" on page 69.
– The transmission parking lock P is engaged.
Please see chapter "Transmission" on
page 241.
The vehicle can still be moved with the driver's
door open and the driver's seat belt unfastened by
releasing the electric parking brake manually. In
this case, the parking brake remains released and
the selected transmission range engaged.
If the parking brake is released in operating mode
D, R or M, or if operating mode D, R or M is se-
lected while the brake pedal is pressed, the engine
starts again.
Auto Start Stop mode is resumed if one of the fol-
lowing conditions is detected within 30 seconds of
leaving the vehicle:
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
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