engine MERCEDES-BENZ GLC SUV 2015 Repair Manual

R
the system detects moisture on the wind-
screen when the air-conditioning system is
switched on
R the battery's charge status is too low
Shifting the transmission to position Pdoes
not start the engine.
If you shift the transmission from Rto D, the
ECO start/stop function is available again
once the èECO symbol reappears in
green in the multifunction display.
Switching the ECO start/stop function
off/on X
To switch off: press ECO button :.
Indicator lamp ;and the èECO sym-
bol in the multifunction display go out.
X To switch on: press ECO button :.
Indicator lamp ;lights up.
If all conditions for automatic engine
switch-off (Y page 192) are fulfilled, the
è ECO symbol is shown in green in the
multifunction display.
If the conditions for automatic engine
switch-off (Y page 192) are not all fulfilled,
the è ECO symbol is shown in yellow in
the multifunction display. If this is the case,
the ECO start/stop function is not availa-
ble.
If indicator lamp ;is off, the ECO start/stop
function has been deactivated manually or as the result of a malfunction. The engine will
then not be switched off automatically when
the vehicle stops. Selecting drive program
S+deactivates the
ECO start/stop function. If you press ECO
button :, the ECO start/stop function is
activated. Driving
193Driving an d parking Z

Problems with the engine
Problem
Possible causes/consequences and
M
MSolutions The engine does not
start. The HOLD function or DISTRONIC PLUS is activated.
X Deactivate the HOLD function (Y page 247) or DISTRONIC
PLUS (Y page 236).
X Try to start the engine again (Y page 189).The engine does not
start. The starter motor
can be heard. R
There is a malfunction in the engine electronics.
R There is a malfunction in the fuel supply.
Before attempting to start the engine again:
X Turn the key back to position 0in the ignition lock.
or
X Press the Start/Stop button repeatedly until all indicator lamps
in the instrument cluster go out.
X Try to start the engine again (Y page 189). Avoid excessively
long and frequent attempts to start the engine, as this 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
gauge display is at the
reserve level. The fuel tank is empty.
X Refuel the vehicle. The engine does not
start. You cannot hear
the starter motor. The on-board voltage is too low because the battery is too weak or
discharged.
X Jump-start the vehicle (Y page 443).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop. The starter motor was exposed to a thermal load that was too high.
X Try to start the engine again (Y page 189).
If the engine still does not start: X Consult a qualified specialist workshop. 194
DrivingDriving and parking

Problem
Possible causes/consequences and
M
MSolutions Vehicles with a petrol
engine:
The engine is not run-
ning smoothly and is
misfiring. There is a malfunction in the engine electronics or in a mechanical
component of the engine management system.
X Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic con-
verter and damage it.
X Have the cause rectified immediately at a qualified specialist
workshop. The coolant tempera-
ture display is showing
more than 120 †. A
display message may
also appear in the mul-
tifunction display and a
warning tone may
sound. The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
X Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 417). Observe the warning
notes as you do so and top up the coolant if necessary. If the coolant level is correct, the engine radiator fan may be faulty.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X If the coolant temperature is below 120 †, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in
mountainous terrain and stop-start traffic. DYNAMIC SELECT switch
This section describes the DYNAMIC SELECT
switch for all vehicles, except PLUG-IN
HYBRID vehicles. Information on the
DYNAMIC SELECT switch on PLUG ‑IN
HYBRID vehicles (Y page 295).
Use the DYNAMIC SELECT switch to change
the drive program. Depending on the drive
program selected, the following vehicle char- acteristics will change:
R the drive (engine and transmission man-
agement)
R the suspension
R the steering R
the availability of the ECO start/stop func-
tion
R the climate control
- the climate control settings
- the rear window heating operation period
- the performance of the seat heating
If the ignition is switched off for less than four
hours, the previously selected drive program
is activated when the engine is next started. If the ignition is switched off for more than fourhours, drive program Cis activated when the
engine is next started. DYNAMIC SELECT switch
195Driving and parking Z

X
Push DYNAMIC SELECT switch :up or
down until the desired drive program is
selected.
The status icon of the selected drive pro-
gram is shown in the multifunction display.
In addition, the current drive program set-
tings are displayed briefly in the Audio 20 or COMAND Online display.
i In a few countries, the ECO start/stop
function is deactivated at the factory due to the quality of the available fuel. In this case,
the ECO start/stop function is not available in any drive program, regardless of the dis-
play in the Audio 20 or COMAND Online
display.
Available drive programs: I
Individual Individual settings
S+
Sport Plus Particularly sporty driving
characteristics
S
Sport Sporty driving character-
istics
C
Comfort Comfortable and econom-
ical driving characteristics E
Economy Particularly economical
driving characteristics
Additional information for drive programs
(Y page 200).
You can also change gear yourself using the
steering wheel gearshift paddles. Further
information on the manual drive program
(Y page 201). Vehicles with the Off-Road Engineering
package:
information on the off-road pro-
grams (Y page 250). 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. G
WARNING
The automatic transmission switches to neu-
tral position Nwhen you switch off the engine.
The vehicle may roll away. There is a risk of an
accident.
After switching off the engine, always switch
to parking position P. Prevent the parked vehi-
cle from rolling away by applying the parking
brake.
Observe the important safety notes for PLUG-
IN HYBRID vehicles (Y page 44). DIRECT SELECT lever
Overview of transmission positions j
Park position with parking lock
k Reverse gear 196
Automatic transmissionDriving and parking

i
Neutral
h Drive
The DIRECT SELECT lever is on the right of the
steering column.
The DIRECT SELECT lever always returns to
its original position. The current transmission
position P,R, Nor Dappears in the transmis-
sion position display in the multifunction dis- play (Y page 198).
Engaging park position P !
If the engine speed is too high, do not shift
the automatic transmission directly from D
to R, from Rto Dor directly to P. Otherwise,
the automatic transmission could be dam-
aged. j
Park position with parking lock
k Reverse gear
i Neutral
h Drive
X Push the DIRECT SELECT lever in the direc-
tion of arrow P.
Engaging park position P automatically Park position
Pis automatically engaged if:
R you switch off the engine using the key and
remove the key
R you switch off the engine using the key or
using the Start/Stop button and open the
driver's door or front-passenger door
R you open the driver's door when the vehicle
is stationary or when driving at a very low speed and the transmission is in position
D
or R
Under certain conditions, the automatic
transmission shifts automatically to transmis-
sion position Pif the HOLD function or
DISTRONIC PLUS is activated. Observe the
information on the HOLD function
(Y page 248) and on DISTRONIC PLUS
(Y page 240).
Engaging reverse gear R !
Only shift the automatic transmission to
R
when the vehicle is stationary.
X If the transmission is in position Dor N:
push the DIRECT SELECT lever up past the first point of resistance.
X If the transmission is in position P: depress
the brake pedal and push the DIRECT
SELECT lever up past the first point of
resistance.
The ECO start/stop function is not available
when reverse gear is engaged. Further infor-
mation on the ECO start/stop function
(Y page 192).
Shifting to neutral N G
WARNING
If children are left unsupervised in the vehicle, they can:
R open doors and endanger other persons or
road users
R climb out and be injured by the traffic
R operate vehicle equipment and, for exam-
ple, trap themselves.
Children could also set the vehicle in motion, for example by:
R releasing the parking brake
R shifting the automatic transmission out of
park position P
R starting the engine.
There is a risk of an accident and injury. Automatic transmission
197Driving and parking
Z

When leaving the vehicle, always take the key
with you and lock the vehicle. Never leave
children unattended in the vehicle. Always
keep the key out of reach of children.
X If the transmission is in position Dor R:
push the DIRECT SELECT lever up or down
to the first point of resistance.
X If the transmission is in position P: depress
the brake pedal and push the DIRECT
SELECT lever up or down to the first point of resistance.
If you switch the engine off with the trans-
mission in position Ror D, the automatic
transmission shifts to Nautomatically.
With the key: if you then open the driver's
door or the front-passenger door or remove
the key from the ignition, the automatic trans-
mission shifts to Pautomatically.
With the Start/Stop button: if you then
open the driver's door or the front-passenger door, the automatic transmission shifts to P
automatically.
If you want the automatic transmission to
remain in neutral N, e.g. when having the
vehicle cleaned in an automatic car wash with a towing system:
With the key:
X Switch the ignition on.
X Depress the brake pedal and keep it
depressed.
X Shift to neutral N.
X Release the brake pedal.
X Release the electric parking brake.
X Switch off the ignition and leave the key in
the ignition lock.
With the Start/Stop button:
X Remove the Start/Stop button from the
ignition lock.
X Insert the key into the ignition lock.
X Switch the ignition on.
X Depress the brake pedal and keep it
depressed. X
Shift to neutral N.
X Release the brake pedal.
X Release the electric parking brake.
X Switch off the ignition and leave the key in
the ignition lock.
Engaging drive position D X
If the transmission is in position Ror N:
push the DIRECT SELECT lever down past
the first point of resistance.
X If the transmission is in position P: depress
the brake pedal and push the DIRECT
SELECT lever down past the first point of
resistance. Transmission position and drive pro-
gram display
The current transmission position and drive
program appear in the multifunction display. :
Status icon, drive program
; Transmission position
= Gear
The arrows in the transmission position dis-
play show how and into which transmission
positions you can shift using the DIRECT
SELECT lever.
If the transmission position display in the mul-
tifunction display is not working, you should
pull away carefully to check whether the
desired transmission position is engaged.
Ideally, you should select transmission posi-
tion Dand drive program Eor S. 198
Automatic transmissionDriving and parking

Transmission positions
B Park position
This prevents the vehicle from roll-
ing away when stopped.
Only shift the transmission into
position Pwhen the vehicle is sta-
tionary (Y page 197). The parking
lock should not be used as a brake when parking. In order to secure
the vehicle, always apply the elec-
tric parking brake in addition to the
parking lock.
Park position Pis automatically
engaged if:
R you switch off the engine using
the key and remove the key
R you switch off the engine using
the key or using the Start/Stop
button and open the driver's
door or front-passenger door
R you open the driver's door when
the vehicle is stationary or driv-
ing at very low speed and the
transmission is in position Dor R
In the event of a malfunction of the
vehicle's electronics, the transmis- sion may lock in position P. Have
the vehicle electronics checked
immediately at a qualified special-
ist workshop. C Reverse gear
Only shift the transmission into
position
Rwhen the vehicle is sta-
tionary. A Neutral
Do not shift the transmission to
N
while driving. Otherwise, the auto-
matic transmission could be dam-
aged.
No power is transmitted from the
engine to the drive wheels.
Releasing the brake pedal will allow
you to move the vehicle freely, e.g. to push it or tow it.
If ESP ®
is deactivated or faulty:
shift the transmission to position N
if the vehicle is in danger of skid-
ding, e.g. on icy roads.
If you switch the engine off with the transmission in position Ror D, the
automatic transmission shifts to N
automatically.
! Rolling in neutral
Ncan lead to
damage to the transmission. 7 Drive
The automatic transmission
changes gear automatically. All
forward gears are available. Driving tips
Changing gear The automatic transmission shifts to the indi-
vidual gears automatically when it is in trans-
mission position D. Gearshifting is deter-
mined by:
R the selected drive program
R the position of the accelerator pedal
R the road speed
Accelerator pedal position Your style of driving influences how the auto-
matic transmission shifts gear:
R little throttle: early upshifts
R more throttle: late upshifts Automatic transmission
199Driving and parking Z

Double-clutch function
When shifting down, the double-clutch func-
tion is active regardless of the currently selec-
ted drive program. The double-clutch function reduces load change reactions and is condu-cive to a sporty driving style. The sound gen-
erated by the double-clutch function depends
on the drive program selected.
Kickdown Use kickdown for maximum acceleration:
X Depress the accelerator pedal beyond the
pressure point.
The transmission shifts to a lower gear
depending on the engine speed.
X Ease off the accelerator pedal once the
desired speed is reached.
The automatic transmission shifts back up.
Rocking the vehicle free Rocking the vehicle free by shifting the trans-
mission repeatedly between transmission
positions Dand Rmay help to free the vehicle
if it has become stuck in mud or snow.
The vehicle's engine management restricts
repeated shifting between transmission posi- tions Dand Rup to a maximum speed of
9 km/h.
To shift back and forth between transmission
positions Dand R, move the DIRECT SELECT
lever up and down past the point of resist-
ance.
Towing a trailer Towing a trailer is not possible with all mod-
els. For further information, see
(Y page 303).
X Drive in the middle of the engine speed
range on uphill gradients.
X Manual shifting: depending on the uphill
or downhill gradient, shift into a gear
(Y page 201) in which the engine will run in
the middle of the engine speed range. This also applies if cruise control,
DISTRONIC PLUS or SPEEDTRONIC are
activated. Drive programs
Drive program I (Individual) In drive program
Ithe following properties of
the drive program can be selected:
R the drive (engine and transmission man-
agement)
R the suspension
R the steering
R the availability of the ECO start/stop func-
tion
R the climate control
i To permanently select the gears in drive
program Iusing the steering wheel pad-
dles, select the M(manual) setting for the
drive.
Drive program S+ (Sport Plus) Drive program
S+is characterised by the fol-
lowing:
R the vehicle exhibits particularly sporty driv-
ing characteristics.
R the vehicle pulling away in first gear.
R the automatic transmission shifting up
later.
R As a result of the later automatic transmis-
sion shift points, the fuel consumption pos-sibly being higher.
R the suspension exhibits particularly stiff
springing and damping settings (vehicles
with AIR BODY CONTROL)
R the ECO start/stop function is not availa-
ble. 200
Automatic transmissionDriving and pa
rking

Drive program S (Sport)
Drive program
Sis characterised by the fol-
lowing:
R the vehicle exhibits sporty driving charac-
teristics.
R the vehicle pulling away in first gear.
R the automatic transmission shifting up
later.
R As a result of the later automatic transmis-
sion shift points, the fuel consumption pos- sibly being higher.
R the suspension exhibits stiff springing and
damping settings (vehicles with
AIR BODY CONTROL).
Drive program C (Comfort) Drive program
Cis characterised by the fol-
lowing:
R the vehicle delivers comfortable, economi-
cal driving characteristics.
R the vehicle pulling away more gently in
forward and reverse gears unless the accel-
erator pedal is depressed fully.
R the vehicle having improved driving stabil-
ity, for example on slippery road surfaces.
R optimal fuel consumption resulting from
the automatic transmission shifting up
sooner. The vehicle is driven in the low
engine speed range and the wheels are less likely to spin.
Drive program E (Economy) Drive program
Eis characterised by the fol-
lowing:
R the vehicle exhibits comfortable, economi-
cal driving characteristics.
R the vehicle pulling away more gently in
forward and reverse gears unless the accel-
erator pedal is depressed fully.
R the vehicle having improved driving stabil-
ity, for example on slippery road surfaces.
R optimal fuel consumption resulting from
the automatic transmission shifting up sooner. The vehicle is driven in the low
engine speed range and the wheels are less
likely to spin.
R during deceleration, the engine is discon-
nected from the drive train. The vehicle
uses kinetic energy and consumes less fuel
(overrun mode).
R the performance of the air-conditioning and
heating systems is reduced. Manual gearshifting
General notes You can change gear yourself using the steer-
ing wheel gearshift paddles. The transmissionmust be in position D.
Depending on which gearshift paddle is
pulled, the automatic transmission immedi-
ately shifts into the next gear up or down, if
permitted.
If you activate manual gearshifting, the mul-
tifunction display will show the current gear
instead of transmission position D.
If manual gearshifting is deactivated, the
gears will be selected automatically.
Temporary setting X
To activate: shift the DIRECT SELECT lever
to position D.
X Pull steering wheel gearshift paddle :
or ;. Automatic transmission
201Driving and parking Z

Further information on activating manual
gearshifting on PLUG-IN HYBRID vehicles
(Y page 296).
Temporary setting will be active for a certain
amount of time. Under certain conditions the minimum amount of time is extended, e.g. in
the case of lateral acceleration, during an
overrun phase or when driving on steep ter-
rain.
X To deactivate: pull steering wheel gear-
shift paddle ;and hold it in place.
or
X Use the DIRECT SELECT lever to shift the
transmission position.
or
X Use the DYNAMIC SELECT switch to
change the drive program.
Shifting gears X
To shift up: pull steering wheel gearshift
paddle ;.
The automatic transmission shifts up to the next gear.
If the maximum engine speed on the cur-
rently engaged gear is reached and you
continue to accelerate, the automatic
transmission automatically shifts up in
order to prevent engine damage.
X To shift down: pull steering wheel gear-
shift paddle :.
The automatic transmission shifts down to the next gear.
Automatic downshifting occurs when
coasting. If the engine exceeds the maximum engine
speed when shifting down, the automatic
transmission protects against engine dam-
age by not shifting down.
Gearshift recommendation The gearshift recommendations assist you in
adopting an economical driving style. The rec- ommended gear is shown in the multifunction
display.
X Shift to recommended gear ;according
to gearshift recommendation :when
shown in the multifunction display of the
instrument cluster.
Kickdown X
For maximum acceleration, depress the
accelerator pedal beyond the pressure
point.
The transmission shifts to a lower gear
depending on the engine speed.
X Shift back up once the desired speed is
reached.
During kickdown, you cannot shift gears
using the steering wheel gearshift paddles.
If you apply full throttle, the automatic trans- mission shifts up to the next gear when the
maximum engine speed is reached. This pre-
vents the engine from overrevving. 202
Automatic transmissionDriving and parking