Display messagesPossible causes/consequences andMSolutions
StArtS RExxIn addition,th eyellow åDEFindicator lamp lights up and awarning
tone sequence sounds.
The DE Fsupply has dropped belo wthe0. 8US gal (3. 0l) reserv emark.
Afte rth emessage appear sfor th efirst time, th eremaining DE Fsupply
will last for approximately 1200 mile s(1900 km). The engin ecan then
only be started another 16 times .
The number of remaining engin estart sXX
(16to 1)is shown in th e
message every time th eengin eis started.
XAd dat least 1. 5US gal (5. 5l) of DE F (Ypage 129).
The å DEFindicator lamp disappear safter no mor ethan
20 seconds after th evehicl ehas stoppe dor you hav eswitched on
th eignition or started th eengin eafter refueling.
In addition ,th eyellow ;CheckEngin eindicator lamp and th eyel-
low å DEFindicator lamp ligh tup in th einstrumen tcluste rand
three short warning tone ssound.
The DE Freducin gagen tis contaminated, diluted or is no tcomplian t
wit hIS O 2224 1.
The exhaust gas aftertreatment is malfunctioning or an emission rel-
evant malfunction has occurred. This malfunction or defect can dam- age the exhaust gas aftertreatment.
XVisit a qualified specialist workshop immediately.
¯
StArtS IdLE
In addition, the yellow åDEF indicator lamp and the ;Check
Engine indicator lamp light up in the instrument cluster and three
warning tones sound.
If the StArtS
IdLEmessage is displayed, you cannot drive the vehicle
at a speed exceeding 5 mph (8 km/h).
XAdd at least 1.5 US gal (5.5 l) of DEF (Ypage 129).
The å DEF indicator lamp disappears after no more than
20 seconds after the vehicle has stopped or you have switched on the ignition or started the engine after refueling.
In addition, the yellow ;Check Engine indicator lamp and the yel-
low å DEF indicator lamp light up in the instrument cluster and a
warning tone sounds.
You cannot drive the vehicle at a speed exceeding 5 mph (8 km/h).
XVisit a qualified specialist workshop immediately.
Display messages179
On-board computer and displays
Z
Display messagesPossible causes/consequences andMSolutions
Highbeam AssistinoperativeHighbeamAssis tis faulty.
XVisit aqualified specialist workshop .
HighbeamAssisttem‐porarily unavaila‐ble
Highbea mAssis tis deactivated and temporarily inoperative.
Possibl ecauses are:
RThe camera' sfunctionalit yis impaire ddue to heav yrain ,snow or
fog .
RThe windshield is dirty in th ecamera' sfield of vision .
XStop thevehicl epayin gattention to roa dand traffic conditions.
XSecur eth evehicl eto preven tit from rollin gaway (Ypage 130).
XClean th ewindshield (Ypage 235), particularly in th ecamera' s
field of vision .
If th emalfunction has been rectified, th eHighbeam Assist
available againmessage appears.
Engine
Display messagesPossible causes/consequences and MSolutions
ExhaustFilter :
Drive at hig hengine speed. SeeOper. Manual
The automatic regeneration of th ediesel particl efilter is no tsufficien t
or has malfunctioned.
XDrive at an engin espeed of abov e2000 rpm until th edisplay mes -
sage disappears.
If th edisplay message does no tgo out after approximately
20 minutes, hav eth emalfunction rectifie dimmediately at aquali-
fie dspecialist workshop .
Check DieselExhaustFluid SeeOperator' sManual
The DE Fsupply has dropped belo w1.5US gal (5. 5l).
XAd dDE Fsupply (Ypage 129).
The display message only disappear swhen th evehicl eis stationary,
at th elatest after 20 seconds as soo nas you switch on th eignition
or start th eengin eafter refueling.
å
XX starts remaining
Three short warning tone salso sound.
Afte rth emessage appear sfor th efirst time, th eremaining DE Fsupply
will last for approximately 1200 mile s(1900 km). The engin ecan then
only be started another 16 times .
The number of remaining engin estart sxx
(16to 0)is shown in th e
message every time th eengin eis started.
XAd dat least 1. 5US gal (5.5l)of DEF (Ypage 129).
Display messages187
On-board computer and displays
Z
Display messagesPossible causes/consequences andMSolutions
å
IdleMod e
The yello w; CheckEngin eindicator lamp also lights up and three
short warning tone ssound.
You canno tdrive th evehicl eat aspeed exceedin g 5mph (8 km/h).
XAddat least 1. 5US gal (5.5l)of DEF (Ypage 129).
The display message and the yellow ;Check Engine indicator
lamp only disappear when the vehicle is stationary, at the latest
after 20 seconds as soon as you switch on the ignition or start the
engine after refueling.
Check DieselExhaust Fluid SeeOperator's Manual
In addition, the yellow ;DEF indicator lamp lights up and a warning
tone sounds.
The DEF reducing agent is contaminated, diluted or is not compliant
with ISO 22241.
XHave the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible.
å
XX starts remaining
The yellow ;Check Engine indicator lamp also lights up and three
short warning tones sound.
After the message appears for the first time, the remaining DEF supply
will last for approximately 1200 miles (1900 km). The engine can then only be started another 16 times.
The number of remaining engine starts xx
(16to 0) is shown in the
message every time the engine is started.
The DEF reducing agent is contaminated, diluted or is not compliant
with ISO 22241.
The exhaust gas aftertreatment is malfunctioning or an emission rel-
evant malfunction has occurred. This malfunction or defect can dam-
age the exhaust gas aftertreatment.
XVisit a qualified specialist workshop immediately.
å
Idle Mode
The yellow ;DEF indicator lamp also lights up and three short
warning tones sound.
The vehicle cannot be driven at a speed exceeding 5 mph (8 km/h).
XVisit a qualified specialist workshop immediately.
?
Coolant Stop, turnengine off
The coolant temperature is too high.
If the vehicle is stopped after being subjected to extreme loads, the
coolant warning lamp may come on when the ignition is switched on
or the engine is restarted. Such loads can be, for example, driving in
mountainous terrain or driving with a trailer.
XRun the engine for approximately 1 minute at idling speed.
XConsult a qualified specialist workshop if the display message con-
tinues to be shown.
188Display messages
On-board computer and displays
Display messagesPossible causes/consequences andMSolutions
*
CoolantCheck level
The coolan tlevel is to olow.
Never run th eengin eif th ecoolan tlevel is to olow. The engin ecould
overheat and be damaged.
XStop th evehicl eas soo nas possible, payin gattention to roa dand
traffic conditions.
XSwitc hoff th eengin eand let it cool down .
XAddcoolan tand be sur eto observ eth ewarning note s
(Ypage 283).
XIf you need to add coolan tfrequently, hav eth eengin ecoolin gsys-
te m checke dat aqualified specialist workshop .
7
Reservefue lDriveto agas statio n
The fuel level has fallen int oth ereserv erange.
XRefue lat th eneares tgas station (Ypage 127).
:
WaterinfuelVisitworkshop
The water that has collecte din th ewater separator has reached th e
maximum level.
XDrain th ewater separator (Ypage 224).
m
Fuelfilter Visitworkshop
The fuel filter is dirty.
XHav eth efuel filter elemen treplace das soo nas possibl eat aquali-
fie dspecialist workshop .
4
Engine oil Add 1.0quart(Canada:1.0liter)
The oil level is to olow.
XChec kth eoil level th enext time you refuel (Ypage 220), and add
oil.
4
Engine oil levelNot whe neng .run ‐ning
You wan tto chec kth eengin eoil level eve nthough th eengin eis still
running.
XSwitc hoff th eengine.
XChec kth eoil level (Ypage 220).
4
Engine oil levelReduce oil level
You haveadded to omuc hengin eoil. There is aris kof damaging th e
engin eor catalytic converter.
XChec kth eoil level (Ypage 220).
XIf theoil level is to ohigh :hav eth eengin eoil extracted at th enext
qualified specialist workshop .
XIf theoil level is correct: hav eth emalfunction rectifie dat th enext
qualified specialist workshop .
Display messages189
On-board computer and displays
Z
Display messagesPossible causes/consequences andMSolutions
4
Engine oil levelStop, turnengineoff
There is no tenough or no oil in th eengine. There is adanger of engin e
damage.
XStop th evehicl eas soo nas possible, payin gattention to roa dand
traffic conditions.
XChec kth eoil level wit hth eoil dipstick (Ypage 221).
XIf theengin eoil level is correct: hav eth emalfunction rectifie d
immediately at aqualified specialist workshop .
XIf theengin eoil level is to olow: hav eth evehicl etowed to aqualified
specialist workshop .
4
Oil sensor Visitworkshop
There isamalfunction in th eengin eoil level display.
XHav eth evehicl echecke dimmediately at aqualified specialist
workshop .
Driving systems
Display messagesPossible causes/consequences and MSolutions
_ _ _
Cruise control
The activation condition sfor cruise control hav eno tbeen met .
You can only activat ecruise control from speeds of 20 mph
(30 km/h).
Cruise contro l
Visit workshop
Cruisecontrol has been deactivated due to amalfunction .
XHavecruise control checke dat aqualified specialist workshop .
LaneKeep. AssistTemporarilyUnavailable
and th eà indicator lamp lights up yellow.
Lan eKeepin gAssis tis deactivated and temporarily inoperative.
Possibl ecauses are:
RThere are no lan emarking spresent.
RThe camera' sfunctionalit yis impaire ddue to heav yrain ,snow or
fog .
RThe camera canno trecogniz eth eroa dmarkings:
-It is to odark .
-The lan emarking sare wor nor are covered, for example, by dir tor
snow.
RThe windshield is dirty in th ecamera' sfield of vision .
XStop thevehicl epayin gattention to roa dand traffic conditions.
XSecur eth evehicl eto preven tit from rollin gaway (Ypage 130).
XClean th ewindshield (Ypage 235), particularly in th ecamera' s
field of vision .
If th eà indicator lamp goe sout ,Lan eKeepin gAssis tis opera-
tional again .
LaneKeep. AssistInoperativeLan eKeepin gAssis tis faulty.
XHav eLan eKeepin gAssis tchecke dat aqualified specialist work-
shop.
190Display messages
On-board computer and displays
ProblemPossible causes/consequences andMSolutions
Ã
The green Lane
Keeping Assist
indicator lamp
lights up while
you are driving.Lane Keeping Assist is operational.
ÃThe red Lane
Keeping Assist
indicator lamp
lights up while
you are driving.
Additionally, an
intermittent
warning tone
sounds.You are driving with the front wheel on a lane marking.
dThe yellow
ASR/ESP®warn-
ing lamp flashes
while the vehicle
is in motion.GWARNING
ESP
®or ASR is intervening because at least one of the wheels has
reached its tire grip limit.
Cruise control is deactivated for the duration of the intervention.
XAdapt your driving style to suit the road and traffic conditions. Do
not use too much throttle.
XDrive slowly.
d The yellow
ASR/ESP®warn-
ing lamp is lit
while the engine
is running.
The all-wheel drive is activated/deactivated. When changing gear,
ASR and ESP®are deactivated.
After changing gear, ASR and ESP®are automatically reactivated.
Engage/disengage the all-wheel drive (
Ypage 148).
d The yellow
ASR/ESP®warn-
ing lamp flashes
slowly while the
vehicle is in
motion.
In vehicles with all-wheel drive the brake system is overheated.
GWARNING
The performance of 4ETS is reduced. The braking power output may
be lower.
There is a risk of an accident.
XDrive on carefully and adapt your driving style to suit the road and
traffic conditions.
XWhen the message is no longer displayed, 4ETS and normal braking
power are available again.
d The yellow
ASR/ESP®warn-
ing lamp is lit
while the engine
is running.
ASR is deactivated.
GWARNING
The driven wheels can spin when accelerating.
There is an increased risk of skidding and accidents.
XActivate ASR again. Exceptions (Ypage 53).
194Indicator and warning lamps in the instrument cluster
On-board computer and displays
ProblemPossible causes/consequences andMSolutions
h!:b
The yellow ESP®, ABS
and ASR/BAS indicator
lamps and the red brake
system indicator lamp
are lit while the engine is
running.
EBD is malfunctioning or deactivated due to undervoltage or malfunc-
tion.
The battery may not be being charged.
GWARNING
The rear wheels could lock sooner than expected when you apply the
brakes. The braking distance can increase in emergency braking sit-
uations.
There is an increased risk of skidding and accidents.
XVehicles with steering wheel buttons: also observe the messages in
the display (Ypage 176).
XStop the vehicle as soon as possible, paying attention to road and
traffic conditions.
XDo not drive on.
XConsult a qualified specialist workshop.
b The red brake sys-
tem indicator
lamp is lit while
the engine is run-
ning.There is insufficient brake fluid in the expansion tank.
GWARNING
Braking performance can be impaired.
There is a risk of an accident.
XVehicles with steering wheel buttons: also observe the messages in
the display (Ypage 176).
XStop the vehicle as soon as possible, paying attention to road and
traffic conditions.
XCheck the brake fluid level in the expansion tank (Ypage 223).
XIf the brake fluid is below the MIN mark: do not drive on!
XDo not add brake fluid. This does not solve the problem.
XConsult a qualified specialist workshop.
b When towing a
trailer: the red
brake system
indicator lamp is
lit while the
engine is running.
Additionally, a
warning tone
sounds.GWARNING
The brake force booster in the trailer is faulty.
The driving and braking characteristics of your vehicle could change.
There is a risk of the trailer overbraking and of you losing control over
the truck/trailer combination.
There is a risk of an accident.
XVehicles with steering wheel buttons: also observe the messages in
the display (Ypage 176).
XStop the vehicle as soon as possible, paying attention to road and
traffic conditions.
XDo not drive on.
XConsult a qualified specialist workshop.
Indicator and warning lamps in the instrument cluster195
On-board computer and displays
Z
ProblemPossible causes/consequences andMSolutions
:
The yellow
ASR/BAS indica-
tor lamp is lit
while the engine
is running.ASR has been deactivated due to a malfunction.
The engine power output may be reduced.
GWARNING
The driven wheels can spin when accelerating.
There is an increased risk of skidding and accidents.
XDrive on with care.
XConsult a qualified specialist workshop as soon as possible.
: The yellow
ASR/BAS indica-
tor lamp is lit
while the engine
is running.BAS has been deactivated due to a malfunction.
GWARNING
The brake system continues to function normally, but without elec-
tronic support.
The braking distance can increase in emergency braking situations.
There is a risk of an accident.
XDrive on with care.
XVisit a qualified specialist workshop immediately.
: The yellow
ASR/BAS indica-
tor lamp is lit
while the engine
is running.ASR and BAS have been deactivated due to undervoltage.
The battery may not be being charged.
GWARNING
The brake system is still available with the normal braking effect.
The driven wheels can spin when accelerating.
The braking distance can increase in emergency braking situations.
There is an increased risk of skidding and accidents.
XDrive on with care.
XVisit a qualified specialist workshop immediately.
196Indicator and warning lamps in the instrument cluster
On-board computer and displays