engine MERCEDES-BENZ GLS 2017 Workshop Manual

leave the vehicle when it is held by hill start
assist.
Hill start assist is not active if: R
you are pulling away on a level road or on a
downhill gradient. R
the transmission is in position N .R
the electric parking brake is applied. R
ESP ®
is malfunctioning.
ECO start/stop function
Introduction The ECO start/stop function switches the
engine off automatically if the vehicle is stopped
under certain conditions.
The engine starts automatically when the driver
wants to pull away again. The ECO start/stop
function thereby helps you to reduce the fuel
consumption and emissions of your vehicle.
Important safety notes
G WARNING
If the engine is switched off automatically and
you exit the vehicle, the engine is restarted
automatically. The vehicle may begin moving.
There is a risk of accident and injury.
If you wish to exit the vehicle, always turn off
the ignition and secure the vehicle against
rolling away.
General notes
C
ECO start/stop display
The ECO start/stop function is activated when-
ever you start the engine using the SmartKey or
the Start/Stop button.
If the engine has been switched off automati-
cally by the ECO start/stop function, the

Aut oma tic engine startThe engin e start s automatically if:R
you switch off th e ECO start/sto p function by
pressing th e ECO butto nR
in transmission position D or N th e brak e
pedal is release d and th e HOLD function is no t
active R
you depress th e accelerato r pedalR
you engage revers e gear RR
you mov e th e transmission out of position PR
you switch to th e Sport Plu s or Sport drive
program (Mercedes-AM G vehicles)R
you activat e manual gearshifting (Mercedes-
AM G vehicles)R
you switch to th e Offroa d drive program
(vehicles without Off-Road Engineering pack-
age) R
you switch to th e Offroa d or Offroa d Plu s
drive program (vehicles wit h Off-Road Engi-
neering package) R
you unfasten your seat belt or open th e driv-
er' s doorR
th e vehicl e start s to rol lR
th e brak e system require s thisR
th e temperature in th e vehicl e interior devi-
ate s from th e set rangeR
th e system detects moisture on th e wind-
shield when th e air-conditioning system is
switched on R
th e battery's condition of charge is to o low
Shifting th e transmission to position P does no t
start th e engine. Deactivating or activating the ECO
start/stop function All vehicles (excep t Mercedes-AM G veh i-
cles) X
To deactivate: press ECO butto n C .
Indicato r lamp D goe s out .X
To activate: press ECO butto n C .
Indicato r lamp D lights up.
If indicator lamp D is off , th e ECO start/sto p
function has been deactivated manually or as
th e result of a malfunction .
Mercedes-AM G veh icles
X
To deactivate: in th e Comfor t drive pro -
gram , press ECO butto n C .
or X
Activat e manual gearshifting ( Y
page 150).
or X
Switc h to th e Sport Plu s or Sport drive pro -
gram ( Y
page 145).
Indicato r lamp D goes out .X
To activate: press ECO butto n C .
Indicato r lamp D lights up. When th e
Sport Plu s or Sport drive program is activa-
ted, th e automatic transmission switches to
th e Comfor t drive program .Driving 143
Driving and parking Z

If indicator lamp D is off, the ECO start/stop
function has been deactivated manually or as
the result of a malfunction.
Problems with the engine Problem
Possible causes/consequences and P Solutions
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 SmartKey back to position 0 in 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 139). Avoid excessively long
and frequent attempts to start the engine as these will drain the
battery.
If the engine does not start after several attempts: X
Consult a qualified specialist workshop.
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 338).
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
Allow the starter motor to cool down for approximately two minutes. X
Try to start the engine again.
If the engine still does not start: X
Consult a qualified specialist workshop.144
Driving
Driving and parking

Problem
Possible causes/consequences and P Solutions
Vehicles with a gasoline
engine:
The engine is not running
smoothly and is misfir-
ing. 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 converter
and damage it. X
Have the cause rectified immediately at a qualified specialist work-
shop.
The coolant temperature
gage shows a value
above 248 ‡ (120 †). 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 322). Observe the warning notes
as you do so and add coolant if necessary.
DYNAMIC SELECT controller Use the DYNAMIC SELECT controller to change
the drive program. Depending on the drive pro-
gram selected the following vehicle character-
istics will change: R
the drive (engine and transmission manage-
ment) R
the transmission R
the suspension R
the steering R
the availability of the ECO start/stop function
Each time you start the engine with the Smart-
Key or the Start/Stop button, the Comfort drive
program is activated. For further information
about starting the engine, see ( Y
page 139).
X
All vehicles (except Mercedes-AMG vehi-
cles): turn DYNAMIC SELECT controller C as many times as necessary until the desired
drive program is selected.
The selected drive program appears in the
multifunction display. After five seconds the
display goes out.
In addition, the current drive program settings
are displayed in the multimedia system dis-
play.
Drive programs available (all vehicles
except Mercedes-AMG vehicles):
Individual
Individual settings
Sport
Sporty driving characteris-
tics
Comfort
Comfortable and economi-
cal driving characteristics
Slippery
Optimal driving characteris-
tics on slippery or snow-
covered roads
Off-road
Optimal driving characteris-
tics for easily negotiable off-
road terrain
Offroad Plus
(vehicles with
Off-Road Engi-
neering pack-
age) Optimal driving characteris-
tics for rough terrainDYNAMIC SELECT controller 145
Driving and parking Z

Further information on: R
the Individual , Sport , Comfort and Slippery
drive programs ( Y
page 149)R
the Offroad drive program (vehicles without
Off-Road Engineering package)
( Y
page 217)R
the Offroad and Offroad Plus drive pro-
grams (vehicles with Off-Road Engineering
package) ( Y
page 218)
X
Mercedes-AMG vehicles: turn DYNAMIC
SELECT controller C as many times as nec-
essary until the desired drive program is
selected.
The selected drive program appears in the
multifunction display. After five seconds the
display goes out.
In addition, the current drive program settings
are displayed in the multimedia system dis-
play.
Drive programs available (Mercedes-AMG
vehicles):
Individual
Individual settings
Comfort
Comfortable and economi-
cal driving characteristics
Sport
Sporty driving characteris-
tics
Sport Plus
Particularly sporty driving
characteristics
Slippery
Optimal driving characteris-
tics on slippery or snow-
covered roads
Additional information for drive programs
( Y
page 149). Automatic transmission
Important safety notes
G WARNING
The automatic transmission switches to neu-
tral position N when 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.
DIRECT SELECT lever
Overview of transmission positions
]
Park position with parking lock ^
Reverse gear \\
Neutral [
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 posi-
tion P , R , N or D appears in the transmission
position display in the multifunction display
( Y
page 148).
Engaging park position P
! If the engine speed is too high or the vehicle
is moving, do not shift the automatic trans-
mission directly from D to R , from R to D or
directly to P . The automatic transmission
could otherwise be damaged.146
Automatic transmission
Driving and parking

X
Push the DIRECT SELECT lever in the direction
of arrow P .
Engaging park position P automatically Park position P is automatically engaged if:R
you switch off the engine using the SmartKey
and remove the SmartKey R
you switch off the engine using the SmartKey
or using the Start/Stop button and open the
driver's door or front-passenger door R
the driver's door is opened when the vehicle is
stationary or driving at very low speed and the
transmission is in position D or R
Under certain conditions, the automatic trans-
mission shifts automatically to transmission
position P if the HOLD function or Distance Pilot
DISTRONIC is activated. Observe the informa-
tion on the HOLD function ( Y
page 185) and on
Distance Pilot DISTRONIC ( Y
page 177).
Engaging reverse gear R
! Only shift the automatic transmission to R
when the vehicle is stationary. X
If the transmission is in position D or 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.
Shifting to neutral N
G WARNING
If children are left unsupervised in the vehicle,
they could: R
open the doors, thus endangering other
people or road users. R
get out and disrupt traffic. R
operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake. R
shifting the automatic transmission out of
park position PR
Start the engine.
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 or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children. X
If the transmission is in position D or 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 resist-
ance.
If you switch the engine off with the transmis-
sion in position R or D , the automatic transmis-
sion shifts to N automatically.
With the SmartKey: if you then open the driv-
er's door or the front-passenger door or remove
the SmartKey from the ignition, the automatic
transmission shifts to P automatically.
With the Start/Stop button: if you then open
the driver's door or the front-passenger door,
the automatic transmission shifts to P automat-
ically.
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:
Using the SmartKey: X
Switch on the ignition. 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 SmartKey
in the ignition lock.
With the Start/Stop button: X
Remove the Start/Stop button from the igni-
tion lock. X
Insert the SmartKey into the ignition lock. X
Switch on the ignition. X
Depress the brake pedal and keep it
depressed. X
Shift to neutral N . X
Release the brake pedal.Automatic transmission 147
Driving and parking Z

D 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 brakes 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 skidding, e.g.
on icy roads.
If you switch the engine off with the
transmission in position R or D , the
automatic transmission shifts to N
automatically.
! Rolling in neutral N can damage
the drive train.
: 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 . This automatic gear shifting
behavior is determined 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 Kickdown Use kickdown for maximum acceleration. X
Depress the accelerator pedal beyond the
pressure point.
The automatic 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 Shifting the transmission repeatedly between
gears D and R may help to free the vehicle if it
has become stuck in slush or snow. The vehi-
cle's engine management system limits the
speed to a maximum of 5 mph (9 km/h) when
shifting back and forth. To shift back and forth
between transmission positions D and R , move
the DIRECT SELECT lever up and down past the
point of resistance.
Towing a trailer X
Drive in the middle of the engine speed range
on uphill gradients. X
Depending on the uphill or downhill gradient,
use the left-hand steering wheel paddle
shifter ( Y
page 150) to select a lower gear,
even if cruise control or Distance Pilot
DISTRONIC are activated.
Drive programs
Slippery drive program The Slippery drive program has the following
characteristics: R
reduced engine and transmission settings for
optimum propulsion on slippery or snow-cov-
ered roads. R
optimized ESP ®
stability control on slippery or
snow-covered roads. R
the vehicle has improved driving stability on
slippery or snow-covered roads, for example.Automatic transmission 149
Driving an d parking Z

Comfort drive program The Comfort drive program has the following
characteristics: R
comfort-oriented engine and transmission
settings. R
optimal fuel consumption resulting from the
automatic transmission shifting up sooner. R
the vehicle pulling away more gently in
forward and reverse gears, unless the accel-
erator pedal is depressed fully. R
the automatic transmission shifting up
sooner. This results in the vehicle being driven
at lower engine speeds and the wheels being
less likely to spin.
Sport drive program The Sport drive program has the following char-
acteristics: R
sporty engine and transmission settings. R
the automatic transmission shifting up later.
the fuel consumption possibly being higher as
a result of the later automatic transmission
shift points. R
the suspension exhibits sporty damping (vehi-
cles with AIRMATIC).
Drive program Sport Plus (Mercedes-
AMG vehicles) The Sport Plus drive program has the following
characteristics: R
the vehicle exhibits particularly sporty driving
characteristics. R
the vehicle pulling away in first gear. R
the automatic transmission shifting up later.
the fuel consumption possibly being higher as
a result of the later automatic transmission
shift points. R
the suspension exhibits particularly firm
springing and damping settings (vehicles with
AIRMATIC). R
the ECO start/stop function is deactivated, it
can, however, be activated again using the
ECO button ( Y
page 143). Individual drive program In the Individual drive program, the following
properties of the drive program can be selected: R
the drive (engine and transmission manage-
ment) R
the transmission R
the suspension R
all vehicles (except Mercedes-AMG vehicles):
the steering R
all vehicles (except Mercedes-AMG vehicles):
availability of the ECO start/stop function
To select the gears in the Individual drive pro-
gram permanently using the steering wheel pad-
dle shifters, select the permanent manual gear-
shift program.
Information about configuring the Individual
drive program with the multimedia system can
be found in the Digital Operator's Manual.
Manual gear shifting
General notes You can change gear yourself using the steering
wheel paddle shifters. The transmission must be
in position D .
Depending on which steering wheel paddle
shifter is pulled, the automatic transmission
immediately shifts into the next gear down or
up, if permitted.
To use manual shifting, you have two options: R
temporary setting R
permanent setting
If you activate manual gearshifting, the multi-
function display will show the current gear
instead of transmission position D .
If manual gearshifting is deactivated, the gears
will be selected automatically.150
Automatic transmission
Driving and parking

Temporary setting X
To activate: shift the DIRECT SELECT lever to
position D .X
Pull steering wheel paddle shifter C or D .
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 terrain. X
To deactivate: pull steering wheel paddle
shifter D and hold it in place.
or X
Use the DIRECT SELECT lever to switch the
transmission position.
or X
Use the DYNAMIC SELECT controller to
change the drive program.
Permanent setting (all vehicles except
Mercedes-AMG vehicles)
X
To activate: shift the DIRECT SELECT lever to
position D .X
Press button C . X
To deactivate: press button C .
or X
Use the DYNAMIC SELECT controller to
change the drive program.
Permanent setting (Mercedes-AMG
vehicles) X
To activate: shift the DIRECT SELECT lever to
position D . X
Press button C .
Indicator lamp D lights up.X
To deactivate: press button C .
or X
Use the DYNAMIC SELECT controller to
switch to the Individual drive program.
Indicator lamp D goes out.
Shifting gears
! Mercedes-AMG vehicles: the automatic
transmission does not shift up automatically
even when the engine limiting speed for the
current gear is reached. When the engine lim-
iting speed is reached, the fuel supply is cut to
prevent the engine from overrevving. Always
make sure that the engine speed does not
reach the red area of the tachometer. There is
otherwise a risk of engine damage.Automatic transmission 151
Driving an d parking Z

X
To shift up: pull steering wheel paddle
shifter D .
The automatic transmission shifts up to the
next gear.
All vehicles (except Mercedes-AMG vehi-
cles): if the maximum engine speed on the
currently engaged gear is reached and you
continue to accelerate, the automatic trans-
mission automatically shifts up in order to
prevent engine damage. X
To shift down: pull steering wheel paddle
shifter C .
The automatic transmission shifts down to
the next gear.
Automatic down shifting occurs when coast-
ing.
If the engine exceeds the maximum engine
speed when shifting down, the automatic
transmission protects against engine damage
by not shifting down.
Shift 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 D according to
gearshift recommendation C when shown in the multifunction display of the instrument
cluster.
Upshifting (Mercedes-AMG vehicles)
! The automatic transmission does not shift
up automatically even when the engine limit-
ing speed for the current gear is reached.
When the engine limiting speed is reached,
the fuel supply is cut to prevent the engine
from overrevving. Always make sure that the
engine speed does not reach the red area of
the tachometer. There is otherwise a risk of
engine damage.
C
Gear indicator D
Upshift indicator
Before the engine speed reaches the red area,
an upshift indicator will be shown in the multi-
function display. X
When the UP message appears in the multi-
function display, pull on the right-hand steer-
ing wheel paddle shifter.
Kickdown Mercedes-AMG vehicles: kickdown is only
possible in the temporary setting. X
For maximum acceleration, depress the
accelerator pedal beyond the pressure point.
The automatic 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 paddle shifters.
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.152
Automatic transmission
Driving an d parking