The bonnet is closed.
A minimum engine temperature has been reached.
Vehicles with Climatronic: the temperature of the vehicle interior is within the preset
temperature range, and the humidity level is not too high.
The defrost function of the air conditioning system is not switched on.
The charge level of the 12-volt vehicle battery is sufficient.
The temperature of the 12-volt vehicle battery is not too low or too high.
The vehicle is not on a steep uphill or downhill gradient.
Vehicles with DSG dual clutch gearbox: the steering wheel is not turned too sharply.
The windscreen heating is not switched on.
Reverse gear is not engaged.
Park Assist is not active.
When the conditions for automatic engine switch-off are fulfilled only during a stationary phase, the
engine can also switch off subsequently, e.g. after switching off the defrost function.
Conditions for an automatic restart
The engine can start automatically under the following conditions:
If the temperature inside the vehicle substantially increases or decreases.
If the vehicle starts rolling.
If the electrical voltage of the 12-volt vehicle battery drops.
If the steering wheel is moved.
As a general rule, the engine always starts again automatically when required by the detected
situation and for the vehicle.
Conditions that require a manual engine start
The engine must be started manually in the following conditions:
If the driver door is opened.
If the bonnet is opened.
Manually deactivating and activating the start/stop system
Press the button in the centre console ⇒ Fig. 102 to deactivate the system manually. If the
start/stop system has been deactivated, the indicator lamp in the button lights up.
Press the button in the centre console again ⇒ Fig. 102 to activate the system manually once
more.
The instrument cluster shows the status of the start/stop system each time the button is pressed.
If the start/stop system has switched the engine off, it will start again as soon as the system is
deactivated manually with the button.
Always deactivate the start/stop system manually when driving through water.
Start/stop mode when Adaptive Cruise Control (ACC) is active
The engine will be switched off after the Adaptive Cruise Control (ACC) has brought the vehicle to a
standstill via an active braking intervention ⇒ Adaptive Cruise Control (ACC) .
The engine will be switched off after the Adaptive Cruise Control (ACC) has brought the vehicle to a
standstill via an active braking intervention ⇒ Adaptive Cruise Control (ACC) .
Vehicles with dual clutch gearbox DSG: when adaptive cruise control (ACC) is activated, the
dual clutch gearbox DSG® can switch to coasting mode.
Vehicles with dual clutch gearbox DSG: when adaptive cruise control (ACC) is activated, the
dual clutch gearbox DSG® can switch to coasting mode.
In the following instances, the engine will restart when the Adaptive Cruise Control (ACC) is active:
If the accelerator is depressed.
When the Adaptive Cruise Control (ACC) has resumed speed and distance control.
If the vehicle ahead has moved on.
WARNING
Never switch off the engine or the ignition while the vehicle is in motion. This can lead to a loss of
vehicle control, accidents and serious injuries.
The airbags and belt tensioners will not work if the ignition is switched off.
The brake servo will not work when the engine is switched off. That is why more pressure on the
brake pedal is needed to brake the vehicle when the engine is switched off.
The power steering will not work when the engine is not running. More power is needed to steer the
vehicle when the engine is switched off.
When the ignition is switched off, the steering lock may activate and you will no longer be able to
steer the vehicle.
The start/stop system must be deactivated if work is to be carried out in the engine compartment.
NOTICE
If the start/stop system is used in very high outside temperatures over a long period, the 12-volt
vehicle battery can be damaged.
The engine stop function may be deactivated automatically if the temperature is above around 38°C
(100°F).
In some cases, it may be necessary to restart the engine manually. Follow any corresponding
messages on the instrument cluster display.
The start/stop function is activated automatically if the Eco driving profile is selected on vehicles
with driving profile selection ⇒ Driving profile selection and 4MOTION Active Control .
Always deactivate the start/stop system manually when driving through water.
Troubleshooting
Engine no longer starts automatically
Vehicles with DSG dual clutch gearbox and coasting function: if the engine does not start
automatically, the warning Error: vehicle power system. Please visit workshop can be displayed in
the instrument cluster.
Start the engine manually ⇒ Starting the engine .
Deactivate the start/stop system manually.
Go to a qualified workshop immediately.
Manual gearbox: selecting a gear
Fig. 103 Gear shift pattern of a 5-speed manual gearbox.
Use fast acceleration only if visibility, weather, road and traffic conditions permit, and other road
users are not put at risk due to the acceleration and driving style.
Always adjust your driving style in accordance with the flow of traffic.
When the TCS is switched off, the drive wheels may spin, especially if the road surface is wet,
slippery or dirty. This may result in you no longer being able to steer or control the vehicle.
WARNING
When the engine is running, the vehicle will start to move as soon as a gear is engaged and the
clutch is released. This also applies when the electronic parking brake has been switched on.
Never engage reverse gear while the vehicle is in motion.
WARNING
Shifting gears incorrectly to gears that are too low can lead to a loss of control over the vehicle, with
accidents and serious injuries as a consequence.
NOTICE
Serious damage to the clutch and gearbox could occur if the gear lever of the manual gearbox is
shifted to a gear which is too low when travelling at high speeds or at high engine speeds. This also
applies if the clutch remains depressed and the gears do not engage.
NOTICE
Please note the following points in order to avoid damage and premature wear:
Do not rest your hand on the gear lever when driving. The pressure from your hand is passed onto
the selector forks in the gearbox.
Ensure that the vehicle has come to a full stop before engaging reverse gear.
Always fully depress the clutch pedal when changing gear.
Do not hold the vehicle by riding the clutch on uphill gradients with the engine running.
Changing up a gear early will help to save fuel and minimise engine noise.
Troubleshooting
Clutch slipping
If the text message and signal tone are repeated approximately every 10 seconds, park the vehicle
safely as soon as possible and switch the engine off. Allow the gearbox to cool down.
Do not drive on until the signal tone stops in order to avoid damage to the gearbox. You should not
pull away or drive the vehicle at very low speeds while the gearbox is overheated.
Downhill speed control
The downhill speed control system helps when braking and travelling downhill in vehicles with a
DSG® dual clutch gearbox ⇒ . The downhill speed control uses the braking power of the engine.
The DSG® dual clutch gearbox selects the best gear depending on the steepness of the gradient and
the current speed. The selector lever must be in position D/S. The downhill speed control is not
active in Tiptronic mode.
As the downhill speed control can shift down only as far as third gear, it may be necessary to activate
the Tiptronic mode when driving down particularly steep inclines. When in Tiptronic mode, select
second or first gear manually in order to make use of the braking effect of the engine and to relieve
the load on the brakes.
The start/stop system is automatically deactivated as long as downhill speed control is active.
Activating downhill speed control automatically:
If the downhill gradient is greater than approximately 6%.
AND: if the selector lever is in position D/S.
In addition, if the cruise control system or Adaptive Cruise Control (ACC) is switched off: if the
vehicle speed is less than approximately 80 km/h (50 mph) or the brake pedal is depressed.
In addition, if the cruise control system or Adaptive Cruise Control (ACC) is active: if the stored speed
is exceeded.
Deactivating downhill speed control automatically:
If the downhill gradient becomes less steep.
OR: if the gearbox shifts up a gear because the engine speed is higher than approximately 4,500 rpm.
Or additionally if the cruise control system or Adaptive Cruise Control (ACC) is active: if the stored
speed can be maintained.
WARNING
The intelligent downhill speed control technology cannot overcome the laws of physics, and
functions only within the limits of the system. Never let the extra convenience afforded by pull-away
assist systems tempt you into taking any safety risks when driving.
Unintentional vehicle movements can cause serious injury.
The downhill speed control cannot replace the full concentration of the driver.
Always adapt your speed and driving style to suit visibility, weather, road and traffic conditions.
An incorrect tyre pressure can cause overheating, sudden tyre damage including tyre bursts and
ripping of the tread surface and thus to a loss of control over the vehicle.
Driving on steep terrain
First read and observe the introductoryinformation and safety warnings⇒Introduction
Driving uphill or downhill
Get out of the vehicle and assess the situation before you attempt to drive up or down a hill:
Walk along the section and check the firmness of the ground. Look out for obstacles and other
hidden dangers ⇒ .
Check the section beyond the hill.
You should not follow the route if it is too steep, uneven or if the ground surface is too loose. Select
another route.
Drive slowly and at constant speed straight up or down a slope.
Accelerate only to the speed you need to climb the slope. Too much acceleration can cause the
wheels to spin and lead to a loss of control of the vehicle. Insufficient throttle increases the
probability of stalling the engine.
Never attempt to stop or turn on a slope.
Avoid allowing the engine to stall.
Do not change gear or engage the clutch when climbing a slope.
Use the offroad display ⇒ Offroad display .
If you cannot continue to drive up a hill
Never turn the vehicle around on an uphill gradient.
If the engine has stalled, depress the footbrake and start the engine again.
Select reverse gear and reverse back slowly in a straight line.
Use the foot brake to keep a constant speed until you have reached a safe place.
Driving downhill
Never exceed the tilt angle of the vehicle! If, in an emergency, you have to traverse the slope when
driving down it and the vehicle threatens to tip over, steer into the fall line immediately.
There is an increased risk of rolling over when driving downhill. Concentrate on steering the vehicle
when driving downhill in particular.
Use the offroad display on steep downhill stretches ⇒ Offroad display .
Drive down steep inclines in first gear.
Use the foot brake sparingly in order not to lose control of the vehicle.
If it is possible and safe, drive straight down the slope in the fall line (maximum gradient).
Do not press the clutch and do not select neutral.
WARNING
Never try driving up or down an incline if it is too steep for the vehicle. The vehicle could slide away,
tip over or roll.
The uphill or downhill gradient must be no greater than the maximum permissible gradient for the
vehicle.
Always drive up and down gradients in the fall line.
Never turn the vehicle when driving up or down gradients. The vehicle could tip over or slide away
sideways.
If the engine stops or if you cannot drive on for any reason, stop the vehicle and depress the brake
pedal. Start the engine again. Select reverse gear, release the brake pedal and using the engine
braking effect to carefully reverse in a straight line along the fall line. Keep the vehicle speed low and
constant.
If you are unable to start the engine, keep your foot steady on the brake pedal and allow the vehicle
to roll back down the track you made when driving up the hill. Keep the vehicle speed low and
constant.
Never let the vehicle roll backwards down a slope in neutral. You could lose control over the vehicle.
Traversing a slope
Fig. 115 Steering into the fall line.
Take all vehicle keys with you when you leave the vehicle.
Lock the vehicle.
Additional points to note on uphill and downhill gradients
Before switching off the engine, turn the steering wheel so that the front wheels will roll against the
kerb if the parked vehicle starts to move.
When facing downhill, turn the wheels so that they face the kerb.
When facing uphill, turn the wheels so that they face the centre of the road.
WARNING
The components of the exhaust system become very hot. This can cause fires and serious injuries.
Never park the vehicle where parts of the exhaust system can come into contact with inflammable
material underneath the vehicle, e.g. undergrowth, leaves, dry grass, spilt fuel, oil etc.
WARNING
The vehicle may roll away if you leave and park the vehicle incorrectly. This can cause accidents and
serious injuries.
Ensure that the electronic parking brake is switched on before you leave the vehicle and the
indicator lamp in the instrument cluster lights up red after you switch off the ignition.
Never remove the vehicle key from the ignition if the vehicle is in motion. The steering lock may be
activated and you will no longer be able to steer or control the vehicle.
Never leave children or people requiring assistance alone in the vehicle. They could switch off the
electronic parking brake, or move the selector lever or gearshift lever, and thus set the vehicle in
motion.
Always take all vehicle keys with you every time you leave the vehicle. The engine can be started and
electrical equipment such as the window controls can be operated. This can cause serious injury.
Never leave children or people requiring assistance alone in the vehicle. They could become trapped
in the vehicle in an emergency and may not be able to get themselves to safety. For example, locked
vehicles may be subjected to very high or very low temperatures depending on the season. This can
cause serious injuries and illness or fatalities, especially in the case of small children.
NOTICE
Objects that protrude from the ground can damage the bumper and other components when
parking the vehicle or driving out of a parking space. Always take care when driving into parking
spaces with high kerbs or fixed boundaries. Stop before the wheels touch the fixed boundaries or
kerbs.