2014 MERCEDES-BENZ CLS check engine

Problems with the transmission
ProblemPossible causes/consequences andSolutions
The transmission has
problems shifting gear.
The transmission is losing oil.
XHave the transmission checked ataqualified specialist
workshop immediately.
The acceleration ability
is deteriorating.
The transmission no
longer changes gear.
The transmission is in emergency mode.
It is only possible to shift intosecondgear and reverse gear.
XStop the vehicle.
XShift the transmission to positionP.
XSwitch off the engine.
XWait at least ten seconds before restarting the engine.
XShift the transmission to positionDorR.
IfDis selected, the transmission shifts intosecondgear; ifRis
selected, the transmission shifts into reverse gear.
XHave the transmission checked ataqualified specialist
workshop immediately.
Refueling
Important safety notes
GWARNING
Fuel is highly flammable. If you handle fuel
incorrectly, there isarisk of fire and
explosion.
You must avoid fire, open flames, creating
sparks and smoking. Switch off the engine
and, if applicable, the auxiliary heating before
refueling.
GWARNING
Fuel is poisonous and hazardous to health.
There isarisk of injury.
You must make sure that fuel does not come
into contact with your skin, eyes or clothing
and that it is not swallowed. Do not inhale fuel
vapors. Keep fuel away from children.
If you or others come into contact with fuel,
observe the following:
RWash away fuel from skin immediately
using soap and water.
RIf fuel comes into contact with your eyes,
immediately rinse them thoroughly with
clean water. Seek medical assistance
without delay.
RIf fuel is swallowed, seek medical
assistance without delay.Donot induce
vomiting.
RImmediately change out of clothingwhich
has come into contact with fuel.
GWARNING
Electrostatic buildupcan create sparks and
ignite fuel vapors. There isarisk of fire and
explosion.
Always touch the vehicle body before opening
the fuel filler flap or touching the fuel pump
nozzle. Any existingelectrostatic buildupis
thereby discharged.
164Refueling
Driving and parking

Xinsert the fuel filler cap intothe holder on
the insideoffuel filler flap.
XCompletely insert the filler neckofthe fuel
pump nozzle into the tank,hook in place
and refuel.
XOnly fill the tank until the pump nozzle
switches off.
iDo not add any more fuel after the pump
stops filling for the first time. Otherwise,
fuel may leak out.
Closing the fuel filler flap
XReplace the cap on the filler neck and turn
clockwise until it engages audibly.
XClose the fuel filler flap.
iClose the fuel filler flap before locking the
vehicle. Otherwise, the locking pin of the
central locking prevents the fuel filler flap
from closing.
iIf you are driving with the fuel filler cap
open, thereserve fuel warning lamp
flashes.Amessage appears in the
multifunction display (Ypage 251).
In addition, the\nCheck Engine warning
lamp may light up (Ypage 273).
For further information on warning and
indicator lamps in the instrument cluster,
see (Ypage 273).
Fuel filler flap emergency release
Xopen the trunklid.
XSlide down the parcel net.
XOpen the right-handside trim panel.
XRemove the first-aid kit (Ypage 320).
XDetach the emergencyrelease from
retainer.
XPull the emergency release in the direction
of arrow.
The fuel filler flap is unlocked.
XOpen the fuel filler flap.
166Refueling
Driving and parking

drivingstyle in termsofconsumption,taking
the actual and selected conditionsinto
consideration.Your driving style can
significantly influence the vehicle's
consumption.
The ECO display consistsofthree bars:
RAcceleration
RConstant
RCoasting
The percent value is the average value of the
three bars. The three bars and the mean value
begin at the value of 50%.Ahigher
percentage indicatesamoreeconomical
driving style.
The ECO display doesnot indicate the actual
fuelconsumption andafixedpercentage
count in the ECO display doesnot indicate a
fixedconsumption figure.
Apart from driving style, consumption is
dependent on many factors such as,e.g.:
Rload
Rcheck
Rcoldstart
Rchoice of route
Relectrical consumers switched on
These factors are not taken into
consideration by the ECO display.
The evaluation of your driving styleiscarried
outusing the following three categories:
RAcceleration(evaluation of all
acceleration processes):
-The bar fills up: moderate acceleration,
especially at higher speeds
-The bar empties: sporty acceleration
RConstant(assessment of driving behavior
at all times):
-The bar fills up: constant speed and
avoidance of unnecessary acceleration
and deceleration
-The bar empties: fluctuations in speed
RCoasting(assessment of all deceleration
processes):
-The bar fills up: anticipatory driving,
keeping your distance and early release
of the accelerator. The vehicle can coast
without use of the brakes.
-The bar empties: frequent braking
iAn economical driving style specially
requires driving at moderate engine
speeds.
To achieveahigher value in the categories
AccelerationandConstant:
Robserve the gearshift recommendations.
Rdrive in drive programE.
iOn long journeys ataconstant speed, e.g.
on the highway, only the bar forConstant
will change.
iThe ECO displaysummaries the driving
characteristics from the start of the journey
to its completion. For this reason, the bars
change dynamically at the beginning of the
journey. On longer journeys, there are
fewer changes. For more dynamic changes,
carry outamanual reset.
Further information on the ECO display
(Ypage 223).
Driving tips171
Driving and parking
Z

Servicing the brakes
!If the red brake warning lamp lights up in
the instrumentcluster and you hear a
warningtonewhile the engine is running,
the brakefluid level may be too low.
Observe additional warningmessages in
the multifunction display.
The brakefluid level may be too low due to
brakepad wear or leakingbrakelines.
Have the brakesystem checked
immediately. This work should be carried
out ataqualified specialist workshop.
!Vehicles with 4MATIC:function or
performancetests may only be carried out
ona2-axle dynamometer. If you are
planning to have the vehicle tested on such
adynamometer, contactanauthorized
Mercedes-BenzCenter to obtain further
information first. Otherwise, you could
damage the drive train or the brakesystem.
!Vehicles with 4MATIC:as the ESP®
system operates automatically, the engine
and the ignition must be switched off
(SmartKey in position0or1in the ignition
lock or Start/Stop button in position0or
1)while the parking brakeisbeing tested
onabrakedynamometer.
Brakingmaneuvers triggeredautomatically
by ESP®may seriouslydamagethebrake
system.
!Vehicles with 4MATIC:as theESP®
system operatesautomatically, theengine
and theignition system must be switched
off (SmartKey in position0or1in the
ignition lockorStart/Stopbuttonin
position0or1)when:
Rtesting theparking brakeonabrake
dynamometer.
Ryou intendtohave thevehicletowed with
oneoftheaxlesraised.
Braking maneuvers triggered automatically
by ESP®may seriouslydamagethebrake
system.
All checksand maintenance work on the
brakesystem must be carried out at a
qualified specialist workshop. Consult a
qualified specialist workshoptoarrangethis.
Havebrakepads installed and brakefluid
replacedataqualified specialist workshop.
If thebrakesystem has only been subject to
moderateloads,you should test the
functionalityofyour brakes at regular
intervals. To do so, press firmly on thebrake
pedal when driving atahigh speed. This
improvesthegripofthebrakepads.
You can findadescription of Brake Assist
(BAS) on (Ypage 67)orofBASPLUSon
(Ypage 67).
The braking characteristics of thevehiclecan
be seriouslyimpaired if:
Rbrakepads other than those recommended
are installed
Rtherecommended brakefluid is notused
Safe braking can no longer be guaranteed.
AMG high-performance and ceramic
brakes
The high-performance brake system is
installed only on the CLS 63 AMG.
The AMG brake systems are designed for
heavy loads. This may lead to noise when
braking. This will depend on:
RSpeed
RBraking force
REnvironmental conditions, such as
temperature and humidity
The wear of individualcomponentsofthe
brake system, such as the brake pads/linings
or brake discs, depends on the individual
driving style and operating conditions.
For this reason, it is impossibletostate a
mileage that will be valid under all
circumstances. An aggressive driving style
will lead to high wear. You can obtain further
information aboutthis from your authorized
Mercedes-BenzCenter.
Driving tips173
Driving and parking
Z

New and replaced brake pads and discs only
reach their optimum braking effect after
several hundred kilometers of driving.
Compensate for this by applying greater force
to the brake pedal. Keep this in mind, and
adapt yourdriving and braking accordingly
during this break-in period.
Excessive heavy braking results in
correspondingly high brake wear. Observe
thebrake wearwarning lamp in the
instrumentcluster and noteany brakestatus
messages in the multifunction display.
Especially for high performancedriving, it is
importanttomaintain and have the brake
system checked regularly.
Driving on wet roads
Hydroplaning
If water has accumulated toacertain depth
on the road surface, there isadanger of
hydroplaning occurring, even if:
Ryou drive at low speeds.
Rthe tires have adequate tread depth.
For this reason,inthe eventofheavy rain or
in conditions in which hydroplaning may
occur, you must drive in the following
manner:
Rlower your speed.
Ravoid ruts.
Rbrakecarefully.
Driving on flooded roads
!Do not drive through floodedareas.
Check the depthofany water beforedriving
through it. Drive slowly through standing
water.Otherwise, water mayenterthe
vehicle interior or the engine compartment.
This can damage the electronic
components in the engine or the automatic
transmission. Water can also be drawn in
by the engine's air suction nozzles and this
can cause engine damage.
Winter driving
Important safety notes
GWARNING
If you shift down onaslippery 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
braking onaslippery road surface.
GDANGER
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 isarisk 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
awindow on the side of the vehicle that is not
facing into the wind.
Have your vehicle winterproofed ataqualified
specialist workshop at the onset of winter.
Observe the notes in the "Winter operation"
section (Ypage 336).
Driving with summer tires
Observe the notes in the "Winter operation"
section (Ypage 336).
Slippery road surfaces
GWARNING
If you shift down onaslippery 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
braking onaslippery road surface.
174Driving tips
Driving and parking

Display messagesPossible causes/consequences andSolutions

Check Brake Pad
Wear
The brakepads/liningshavereached their wear limit.
XVisitaqualified specialist workshop.

mbrace Inoperative
Oneormoremain features of thembrace system are
malfunctioning.
XHavethembrace system checkedimmediately ataqualified
specialist workshop.
PRE-SAFE
Inoperative See
Operator'sManual
ImportantfunctionsofPRE-SAFE®have failed.All other occupant
safetysystems, e.g. air bags, remain available.
XVisitaqualified specialist workshop immediately.
PRE-SAFE
Functions
CurrentlyLimited
See Operator's
Manual
PRE-SAFE®Brake is temporarily inoperative.
Possible causes are:
Rfunction is impaired due to heavy rain or snow.
Rthe sensors in the radiator grill and the bumper are dirty.
Rthe radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio
stationsorother sources of electromagnetic radiation.
RAMG vehicles: ESP®is deactivated.
Rthe system is outside the operating temperature range.
Rthe on-board voltage is too low.
When the causes stated above no longer apply, the display
message disappears.
PRE-SAFE®Brake is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible,paying
attention to road and traffic conditions.
XSecure the vehicle against rollingaway (Ypage 167).
XClean the sensors in the radiator grill and the bumper
(Ypage 315).
XRestartthe engine.
XAMG vehicles: reactivate ESP®(Ypage 70).
PRE-SAFE
Functions Limited
See Operator's
Manual
PRE-SAFE®Brake is inoperative due toamalfunction. BAS PLUS
or the distance warning signal may also have failed.
XVisitaqualified specialist workshop.
Display messages241
On-board computer and displays
Z

Display messagesPossible causes/consequences andSolutions
Adaptive Highbeam
Assist Inoperative
Adaptive Highbeam Assistisfaulty.
XVisitaqualified specialist workshop.
Adaptive Highbeam
Assist Currently
Unavailable See
Operator's Manual
Adaptive Highbeam Assist is deactivated and temporarily
inoperative. Possible causes are:
Rthe windshieldinthe camera's field of vision is dirty.
Rvisibility is impaired due to heavy rain, snow or fog.
XCleanthe windshield.
If the system detectsthat the camera is fully operational again,
theAdaptive Highbeam Assist Now Availablemessage is
displayed.
Adaptive Highbeam Assist is operational again.
Engine
Display messagesPossible causes/consequencesandSolutions

Check Coolant
Level See
Operator's Manual
The coolant level is too low.
!Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
XAdd coolant, observing the warning notes before doing so
(Ypage 308).
XIf coolant needs to be added more often than usual, have the
engine coolant system checked ataqualified specialist
workshop.
The fan motor is faulty.
XAt coolant temperatures below 248‡(120 †), drive to the
nearest qualified specialist workshop.
XAvoid subjecting the engine to heavy loads, e.g. driving in
mountainous terrain, and stop-and-go traffic.
248Display messages
On-board computer and displays

Display messagesPossible causes/consequences andSolutions
The battery is notbeing charged.
Awarning tone also sounds.
Possible causes are:
Radefective alternator
Ratornpoly-V-belt
Ramalfunctionintheelectronics
XPull overand stop the vehiclesafelyand switch off the engine,
paying attentiontoroadand traffic conditions.
XSecure the vehicleagainst rolling away (Ypage 167).
XOpenthe hood.
XCheck whether the poly-V-belt is torn.
If the poly-V-belt is torn:
!Do not continue driving. The engine could otherwise overheat.
XConsultaqualified specialist workshop.
If the poly-V-belt is not damaged:
XVisitaqualified specialist workshop.

Check Engine Oil
Level At Next
Refueling
The engine oil level has dropped to the minimum level.
Awarning tone also sounds.
XCheckthe oil level when next refueling, at the latest
(Ypage 307).
XIf necessary, add engine oil (Ypage 308).
XHave the engine checked ataqualified specialist workshop if
engine oil needs to be added more often than usual.
!Avoid long journeys with too little engine oil. The engine will
otherwise be damaged.
Information on approved engine oils can be obtained from any
qualified specialist workshop or on the Internet at http://
bevo.mercedes-benz.com.
250Display messages
On-board computer and displays