Problems with the engine
Problem Possible causes/consequences and
0050
0050Solutions The engine does not
start.
The starter motor can
be heard. There is air in the fuel system.
X
Turn the key back to position 0in the ignition lock before
attempting to start the engine again.
X Start the engine again.
Please bear in mind that lengthy and frequent starting attempts
will drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine does not
start.
The starter motor can
be heard. The reserve
fuel warning lamp is lit
and the fuel gage is at
0. The fuel tank has been run dry.
X
Refuel the vehicle.
If you drive until the fuel tank is completely empty, air may get into
the fuel system. If the engine does not start after refueling, bleed
the fuel system as follows:
X Turn the key to position 2in the ignition for approximately
10 seconds.
X Start the engine continuously for a maximum of 60 seconds.
If the engine does not start:
X Wait approximately 2 minutes.
X Restart the engine continuously for a maximum of 60 seconds.
X If the engine still fails start, do not continue trying to start it.
X Consult a qualified specialist workshop. The vehicle cannot be
driven at a speed
exceeding 5 mph
(8 km/h).
The yellow
00B9engine
diagnostic lamp and
the yellow 00E2DEF
indicator lamp 2
light
up. The exhaust gas aftertreatment is faulty, an emission-relevant
malfunction has occurred or the DEF reserve has been used up.
This malfunction or defect can damage the exhaust gas after-
treatment.
X
Observe the messages in the display:
R
on vehicles without steering-wheel buttons (Y page 202)
R on vehicles with steering-wheel buttons (Y page 213) and
(Y page 213). The engine does not
start.
The starter motor can-
not be heard. The battery isolating switch is switched off.
X
Switch on the power supply (Y page 136).2
Only vehicles without steering-wheel buttons. Driving
143Driving and parking Z
Problem Possible causes/consequences and
0050
0050Solutions The engine does not
start.
The starter motor can-
not be heard. The on-board voltage is too low. The battery is too weak or dis-
charged.
X
Jump-start the vehicle (Y page 278).
If the engine cannot be jump-started, the starter motor is faulty.
X Consult a qualified specialist workshop. The engine does not
start.
The starter motor can-
not be heard. The battery is discharged or faulty.
X
Check the battery for damage.
X Charge the battery (Y page 266).Automatic transmission
Important safety notes
G
WARNING
If the engine speed is above the idling speed
and you engage transmission position Dor
R, the vehicle could pull away suddenly. There
is a risk of an accident.
When engaging transmission position Dor R,
always firmly depress the brake pedal and do
not simultaneously accelerate.
! Vehicles with automatic transmission
may roll only briefly in the neutral position
N. Prolonged rolling of the wheels, e.g.
when being towed, will result in transmis-
sion damage. Selector lever
005D
Park position with parking lock
005E Reverse gear
005C Neutral
005B Drive
The display in the instrument cluster shows
the present selector lever position or the cur-
rent shift range:
R on vehicles with steering wheel buttons
(Y page 189)
R on vehicles without steering wheel buttons
(Y page 184) 144
Automatic transmissionDriving and parking
Make sure that tool
0083remains in tank filler
cap 0044while doing so.
X Only fill up the DEF tank until the DEF level
is visible for the first time in the filler neck.
X Replace blue tank filler cap 0044and turn
clockwise.
X Pull tool 0083out of tank filler cap 0044and
stow with the vehicle tool kit in the footwell
on the co-driver's side.
X Pull cover 0085up over hole 0087of tank filler
cap 0044, turn and release.
X Turn blue tank filler cap 0044.
If tank filler cap 0044turns freely, the DEF
tank is closed. Parking
Important safety notes
G
WARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with
hot parts of the exhaust system or exhaust
gas flow. There is a risk of fire.
Park the vehicle so that no flammable mate-
rials come into contact with parts of the vehi-
cle which are hot. Take particular care not to
park on dry grassland or harvested grain
fields. G
WARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect,
for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving. G
WARNING
If you leave children unsupervised in the vehi-
cle, they could set it in motion by, for example:
R release the parking brake.
R shift the automatic transmission out of the
parking position P.
R start the engine.
In addition, they may operate vehicle equip-
ment and become trapped. There is a risk of
an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
! A moving vehicle can lead to damage to
the vehicle or damage to the drive train.
! When the vehicle is parked, always
remove the key to prevent the battery from
becoming discharged.
On vehicles with a battery isolating switch,
switch off the power supply if the vehicle is
to be out of use for a longer period of time.
Always park your vehicle safely and according
to legal requirements and secure it against
rolling away.
To ensure that the vehicle is properly secured
against rolling away unintentionally:
R the parking brake must be firmly applied
R the selector lever must be in position Pand
the key must be removed from the ignition
lock
R on steep uphill or downhill gradients, the
front wheels must be turned towards the
curb
R on steep uphill or downhill gradients, the
vehicle must be secured at the rear axle,
e.g. with a wheel chock or similar object
Use the wheel chock (Y page 153) to do so. Parking
151Driving and parking Z
engine's air suction nozzles and this can
cause engine damage.
If you have to drive on stretches of road on
which water has collected, please bear in
mind that:
R the water level of standing water should not
be above the lower edge of the front
bumper
R do not drive faster than walking speed Driving in winter
General notes G
WARNING
If you shift down on a slippery road surface in
an attempt to increase the engine's braking
effect, the drive wheels could lose their grip.
There is an increased danger of skidding and
accidents.
Do not shift down for additional engine brak-
ing on a slippery road surface. G
DANGER
If the exhaust pipe is blocked or adequate
ventilation is not possible, poisonous gases
such as carbon monoxide (CO) may enter the
vehicle. This is the case, e.g. if the vehicle
becomes trapped in snow. There is a risk of
fatal injury.
If you leave the engine or the auxiliary heating
running, make sure the exhaust pipe and area
around the vehicle are clear of snow. To
ensure an adequate supply of fresh air, open
a window on the side of the vehicle that is not
facing into the wind.
Have your vehicle winterproofed at a qualified
specialist workshop in good time at the onset
of winter.
i Do not cover the radiator, e.g. with a win-
ter cover. The measurements of the on-
board diagnostic system may otherwise
return inaccurate values. Some of these values are legally prescribed and must
therefore always be exact.
Observe the notes in the "Winter operation"
section (Y page 288).
Driving with summer tires Observe the notes in the "Winter operation"
section (Y
page 288).
Slippery road surfaces G
WARNING
If you shift down on a slippery road surface in
an attempt to increase the engine's braking
effect, the drive wheels could lose their grip.
There is an increased danger of skidding and
accidents.
Do not shift down for additional engine brak-
ing on a slippery road surface. G
WARNING
The outside temperature indicator is not
designed to serve as an ice-warning device
and is therefore unsuitable for that purpose.
Indicated temperatures just above the freez-
ing point do not guarantee that the road sur-
face is free of ice. The road may still be icy,
especially in wooded areas or on bridges.
! Vehicles with automatic transmission
may roll only briefly in the neutral position
N. Prolonged rolling of the wheels, e.g.
when being towed, will result in transmis-
sion damage.
If the vehicle threatens to skid or cannot be
stopped when moving at low speed:
X Shift the transmission to neutral position
N.
X Try to maintain control of the vehicle using
corrective steering.
Drive particularly carefully on slippery roads.
Avoid sudden acceleration, steering and
braking maneuvers. Do not use cruise
control. 158
Driving tipsDriving and parking
You can find further information on winter
tires and snow chains in the "Wheels and
tires" section (Y page 288). Driving off-road
Important safety notes G
WARNING
If you drive on a steep incline at an angle or
turn when driving on an incline, the vehicle
could slip sideways, tip and rollover. There is
a risk of an accident.
Always drive on a steep incline in the line of
fall (straight up or down) and do not turn the
vehicle. G
WARNING
When driving off-road, your body is subject to
forces from all directions, due to the uneven
surface. You could be thrown from your seat,
for instance. There is a risk of injury.
Always wear a seat belt, even when driving off-
road. G
WARNING
If you drive over obstacles or in ruts, the steer-
ing wheel may jerk out of your grip, causing
injury to your hands.
Always hold the steering wheel firmly with
both hands. When driving over obstacles, you
must expect steering forces to increase
briefly and suddenly. G
WARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with
hot parts of the exhaust system. There is a
risk of fire.
When driving off road or on unpaved roads,
check the vehicle's underside regularly. In
particular, remove parts of plants or other
flammable materials which have become
trapped. In the case of damage, contact a
qualified specialist workshop. !
When driving off-road or on unpaved sur-
faces, check the underside of the vehicle
and the wheels and tires at regular inter-
vals. In particular, remove any trapped for-
eign objects, e.g. stones and branches.
Such foreign objects may:
R damage the chassis, the fuel tank or the
brake system
R cause imbalances and thus vibrations
R be flung out when you continue driving
If there is any damage, inform a qualified
specialist workshop.
! If there are steep gradients while driving
off-road, a sufficient filling level in the DEF
tank must be ensured. Make sure for this
reason that there is a minimum fill level of
ten liters before driving off-road.
When driving off-road and on construction
sites, sand, mud and water mixed with oil, for
example, may get into the brakes. This may
lead to a reduction in braking performance or
total brake failure, also as a result of
increased wear. The braking characteristics
will vary depending on the material that has
got into the system. Clean the brakes after
driving off-road. If you then notice reduced
braking performance or hear scraping noises,
have the brake system checked at a qualified
specialist workshop. Adjust your driving style
to the changed braking characteristics.
Driving off-road or on construction sites
increases the possibility of vehicle damage
which may in turn lead to the failure of certain
assemblies and systems. Adapt your driving
style to the off-road driving conditions. Drive
carefully. Have any vehicle damage rectified
at a qualified specialist workshop as soon as
possible.
When driving on rough terrain, do not shift the
transmission into the neutral position. You
could lose control when attempting to brake
the vehicle with the service brake. If your
vehicle cannot manage an uphill slope, drive
back down the slope in reverse gear. Driving tips
159Driving and parking Z
The brightness of the indicator/warning
lamps is adjusted automatically according to
the ambient light.
Collision warning
If a vehicle is detected in the monitoring range
of Blind Spot Assist and you switch on the
corresponding turn signal, a double warning
tone sounds once. Red warning lamp 0043
flashes. If the turn signal remains on,
detected vehicles are indicated by the flash-
ing of red warning lamp 0043. There are no fur-
ther warning tones.
Activating/deactivating Blind Spot Assist
i Blind Spot Assist is activated when you
switch on the ignition.
X Turn the key to position 2in the ignition
lock.
Warning lamps 0043in the exterior mirrors
light up red for approximately
1.5 seconds and then turn yellow.
X To deactivate: press the button in
the center console (Y page 37).
The yellow indicator lamp in exterior mir-
ror 0043first flashes and then lights up con-
tinuously. Blind Spot Assist is deactivated.
X To activate: press the button in the
center console again (Y page 37).
The yellow indicator lamp in exterior mir-
ror 0043flashes initially. If you exceed
19 mph (30 km/h) while driving, the yellow
indicator lamp in exterior mirror 0043goes
out. Blind Spot Assist is activated.
Towing a trailer
If you attach a trailer, make sure that you have
correctly established the electrical connec-
tion. This can be accomplished by checking
the trailer lighting. Blind Spot Assist is then
deactivated. The indicator lamp in the exte-
rior mirrors lights up yellow.
On vehicles with steering wheel buttons, the
message: Blind Spot Assist deacti‐
Blind Spot Assist deacti‐ vated vated
also appears in the multifunction dis-
play.
Lane Keeping Assist General notes
Lane Keeping Assist monitors the area in
front of your vehicle by means of a camera at
the top of the windshield. Lane Keeping Assist
detects lane markings on the road and warns
you before you leave your lane unintention-
ally.
0043
Lane Keeping Assist camera
Lane Keeping Assist supports you from
speeds of approximately 40 mph(60 km/h).
Important safety notes G
WARNING
Lane Keeping Assist may not always clearly
recognize lane markings.
In this case, Lane Keeping Assist may:
R give an unnecessary warning
R not give a warning
There is a risk of an accident.
Always pay particular attention to the traffic
situation and stay in lane, in particular if
warned by Lane Keeping Assist. G
WARNING
The Lane Keeping Assist warning does not
return the vehicle to the original lane. There
is a risk of an accident. 166
Driving systemsDriving and parking
You should always steer, brake or accelerate
yourself, in particular if warned by Lane Keep-
ing Assist.
Lane Keeping Assist may not work properly
or may not work at all if the vehicle is incor-
rectly loaded (Y page 242).
If you fail to adapt your driving style, Lane
Keeping Assist can neither reduce the risk of
accident nor override the laws of physics.
Lane Keeping Assist cannot take into account
road, weather or traffic conditions. Lane
Keeping Assist is only an aid. You are respon-
sible for the distance to the vehicle in front,
for vehicle speed, braking in good time and
for staying in your lane.
Lane Keeping Assist does not keep your vehi-
cle in its lane.
The system may be impaired or may not func-
tion if:
R there is poor visibility, e.g. due to insuffi-
cient illumination of the road, or due to
snow, rain, fog or spray
R there is glare, e.g. from oncoming traffic,
the sun or reflection from other vehicles
(e.g. if the road surface is wet)
R the windshield is dirty, fogged up, damaged
or covered, for instance by a sticker, in the
vicinity of the camera
R no, or several, unclear lane markings are
present for one lane, e.g. in a construction
area
R the lane markings are worn away, dark or
covered up, e.g. by dirt or snow
R the distance to the vehicle in front is too
small and the lane markings thus cannot be
detected
R the lane markings change quickly, e.g.
lanes branch off, cross one another or
merge
R the road is narrow and winding
R there are highly variable shade conditions
on the road
A warning may be given if a front wheel
passes over a lane marking. In addition, a warning tone sounds and the
00B0indicator
lamp in the instrument cluster lights up.
Activating/deactivating Lane Keeping
Assist
Lane Keeping Assist is automatically acti-
vated when you start the engine.
X To deactivate: press the button in
the center console (Y page 37).
On vehicles without steering wheel but-
tons:
OFF OFF flashes briefly in the display and the
00B0 indicator lamp in the instrument clus-
ter flashes and then lights up continuously.
On vehicles with steering wheel but-
tons:
The message: Lane Keeping Assist Lane Keeping Assist
deactivated
deactivated appears in the display and
the 00B0 indicator lamp in the instrument
cluster flashes and then lights up contin-
uously.
Lane Keeping Assist is deactivated.
X To activate: press the button in the
center console again (Y page 37).
On vehicles without steering wheel but-
tons:
ON ON flashes briefly in the display and the
00B0 indicator lamp in the instrument clus-
ter flashes and then goes out.
On vehicles with steering wheel but-
tons:
The message: Lane Keeping Assist Lane Keeping Assist
activated
activated appears in the display and the
00B0 indicator lamp in the instrument clus-
ter flashes and then goes out.
Lane Keeping Assist is activated.
A Lane Keeping Assist warning is suppressed
if:
R a driving safety system intervenes, such as
ABS, BAS or ESP ®
.
R you have set the turn signal and a lane
change is detected. In this case, the warn- Driving systems
167Driving and parking Z
Observe the following when towing a trailer:
R Practice driving around bends, stopping
and backing up at a place where there is no
traffic. This enables you to gain experience
and get used to the new handling charac-
teristics.
R Before driving, check:
-that the trailer tow hitch and ball cou-
pling are secure
- that the safety switch for a braked trailer
is functioning properly
- that the safety chains are secure and not
damaged
- that the electrical connections are
secure
- that the lights are working
- that the wheels are in good order and the
tire pressure is correct
R Adjust the exterior mirrors to provide an
unobstructed view of the rear section of the
trailer.
R If the trailer has electronically controlled
brakes, pull the vehicle/trailer combina-
tion away carefully. Brake manually using
the brake controller and check that the
brakes are working.
R Secure the load on the trailer according to
the applicable specifications and current
standards on securing loads
(Y page 244).
R When driving with a trailer, check at regular
intervals that the load is secured and that
the brakes and lights are working.
R Bear in mind that the handling will be less
stable when towing a trailer than when driv-
ing without one. Avoid sudden steering
movements.
R The vehicle/trailer combination is heavier,
accelerates more slowly and has a
decreased gradient climbing capability and
a longer braking distance.
It is more susceptible to crosswinds and
requires cautious steering.
R If possible, do not brake suddenly, but
rather moderately at first so that the trailer can activate its brakes. Then increase the
force on the brake pedal.
R If the automatic transmission repeatedly
shifts between gears when driving on
inclines, restrict the shift range. Select shift
range 4,3,2or 1.
Driving in a low gear and at a low speed
reduces the risk of damaging the engine.
R When driving on a downhill gradient, shift
to a low gear and take advantage of the
engine's braking effect.
Avoid continuous brake application as this
may overheat the vehicle brakes and, if
installed, the trailer brakes.
R If the coolant temperature increases dra-
matically while the air-conditioning system
is switched on, switch off the air-condition-
ing system.
Coolant heat can also be dissipated by
switching the airflow and the temperature
of the heater/air conditioning to the maxi-
mum level. Open the windows if necessary.
R When overtaking, pay particular attention
to the extended length of your vehicle/
trailer combination.
Due to the length of your vehicle/trailer
combination you need an additional dis-
tance before you can return to your original
lane. Uncoupling a trailer
G
WARNING
If you uncouple a trailer with the overrun
brake engaged, you could trap your hand
between the vehicle and the trailer drawbar.
There is a risk of injury.
Do not uncouple a trailer if the overrun brake
is engaged.
! Do not disconnect a trailer with an
engaged overrun brake. Otherwise, your
vehicle could be damaged by the rebound-
ing of the overrun brake. Towing a trailer
177Driving and parking Z