Display messages
Possible causes/consequences and 0050 0050Solutions &
WARNING Danger of bu rns when opening the hood
If yo u open the hood when the engine has overheated or during
a fire inthe engine compartment, you could come into con tact
wi th hot gases or other escaping operating fluids. #
Before opening the hood, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the
hood closed and call thefire service. &
WARNING Risk of scalding from hot coolant
The engine cooling sy stem is pressurized, particularly when the
engine is warm. If you open the cap, you could be scalded byhot
coolant spr aying out. #
Let the engine cool down before opening the cap. #
When opening the cap, wear pr otective glove s and saf ety
gl asses. #
Open the cap slowly torelease pressure. #
Wait until the engine has cooled down. #
Ensure that the air supply tothe engine radiator is not obstruc‐
te d. #
Avoiding high engine loads, continue tothe nearest qualified
specialist workshop. Ensure that the coolant temp erature dis‐
play remains below 248°F (120°C).
00AC Check Coolant Level See
Operator's Manual *T
he coolant le vel is too lo w. &
WARNING Risk of scalding from hot coolant
The engine cooling sy stem is pressurized, particularly when the
engine is warm. If you open the cap, you could be scalded byhot
coolant spr aying out. #
Let the engine cool down before opening the cap. #
When opening the cap, wear pr otective glove s and saf ety
gl asses. #
Open the cap slowly torelease pressure. *
NO
TEEngine damage due toinsuf ficient coolant #
Avoid long journe yswith insuf ficient coolant. #
Top up coolant (/ page 282).
Regeneration Not Possi-
ble *N
otall conditions ha vebeen met forre ge neration of the diesel par‐
ticulate filter . #
Continue driving as normal until all conditions ha vebeen met for
re ge neration of the diesel particulate filter.
The load condition of the diesel particulate filter is over 50% and the
message still appears on the instrument clus ter. Displ
aymessa ges and warning and indicator lamps 367
Display messages
Possible causes/consequences and 0050 0050Solutions #
Consult a qualified specialist workshop. DEF (Diesel Exhaust Fluid)
Display messages
Possible causes/consequences and 0050 0050Solutions
00E2
Refill Additive See Opera-
tor's Manual *
In addition, theye llow 00E2 DEF indicator lamp lights up on the
instrument clus ter and a warning tone sounds.
The DEF supply has fallen below thefirs twa rning thre shold. #
Add at least 2.5 gal (9.5 l) of DEF (/ page137).
The 00E2 DEF indica tor lamp only disappea rswhen theve hicle
is stationar y,at the latest af ter 20 seconds, as soon as you
switch on the ignition or start the engine af terto pping up.
00E2
Refill Additive Starts
until Emerg. Op.: XXX
See Operator's Manual *I
n addition, theye llow DEF indicator lamp lights up and a warning
to ne sounds.
The DEF supply has fallen below there ser vemar k.
Af terth e message appears forth efirs t time, there maining DEF sup‐
ply will last for appro ximately 12 00 miles (1900 km). The engine can
th en only be star ted ano ther 16 times. The number of remaining
engine starts XX(16 to1) is shown in the message everytime the
engine is star ted. #
Add at least 2.5 gal (9.5 l) of DEF (/ page137). The 00E2DEF
indica tor lamp only disappea rswhen theve hicle is stationar y,at
th e latest af ter 20 seconds, as soon as you swit chon the igni‐
tion or start the engine af terto pping up.
00E2
Refill Additive Emer-
gency Op.: XXX mph See
Operator's Manual *
In addition, theye llow DEF indicator lamp 00E2lights up on the
instrument clus ter and a warning tone sounds.
If th eRefill Additive Emergency Op.: XXX mph See Operator's Man-
ual display message is shown, you can only drive theve hicle at a
maximum speed of 5 mph (8 km/h). #
Add at least 2.5 gal (9.5 l) of DEF (/ page137).
The DEF indica tor lamp 00E2only disappea rswhen theve hicle
is stationar y,at the latest af ter 20 seconds, as soon as you
switch on the ignition or start the engine af terre filling.
0099
Additive System Fault
See Operator's Manual *
In addition, theye llow 00B9 Check Engine warning lamp on the
instrument clus ter lights up and a warning tone sounds.
The DEF reducing agent is con taminated, diluted or is not compliant
with ISO 222 41 . #
Have the DEF supply tank cleaned and refilled at a qualified spe‐
cialist workshop as soon as possible.
0099 Additive System Fault
Starts until Emerg. Op.:
XXX See Operator's Man-
ual *
In addition, theye llow 00B9 Check Engine warning lamp on the
instrument clus ter lights up and a warning tone sounds.
The DEF reducing agent is con taminated, diluted or is not compliant
with ISO 222 41 .
The exhaust gas af tertre atment sy stem is defective or an emissions-
re leva nt malfunction has occu rred. This malfunction or defect can
damage theex haust gas af tertre atment sy stem. 368
Display messages and warning and indicator lamps
Display messages
Possible causes/consequences and 0050 0050Solutions
Af terth e message appears forth efirs t time, the engine can only be
st ar ted ano ther 10 times. The number of remaining engine starts XX
(10 to1) is shown in the message everytime the engine is star ted. #
Visit a qualified specialist workshop immediately.
0099 Additive System Fault
Emergency Op.: XXX
mph See Operator's
Manual *
In addition, theye llow 00B9 Check Engine warning lamp on the
instrument clus ter lights up and a warning tone sounds.
Yo u can only drive theve hicle at a maximum speed of 5 mph
(8 km/h). #
Visit a qualified specialist workshop immediately. Ti
res Display messages
Possible causes/consequences and 0050
0050 Solutions
Tire Pressure Monitor
Inoperative No Wheel
Sensors *T
he ins talled wheels do not ha vesuitable tire pressure sensors. The
tire pressure monitor has been switched off. #
Install wheels with suitable tire pressure sensors.
0077
Tire Press. Sen. Missing *T
he tire pressure sensor signal is missing from one or more tires.
No pressure value is displa yedfo rth e tire in question. #
Have thefa ulty tire pressure sensor replaced at a qualified spe‐
cialist workshop.
Tire Press. Monitor Cur-
rently Unavailable *T
here is inter fere nce from a po werful source of radio wav es As a
re sult, no signals from the tire pressure sensors are received. The
tire pressure monitor is temp orarily una vailable. #
Continue driving.
As soon as the cause has been eliminated, the tire pressure
monitor automatically switches on.
0077 Warning Tire Malfunction *T
he pressure in one or more tires suddenly falls. The wheel position
is shown. &
WARNING Risk of an accident from driving wi thaflat tire
Flat tires are dangerous in thefo llowing ways:
R The tires can overheat and cause a fire.
R The driving characteristics, as well as steering and braking,
may be greatly impaired.
Yo u could then lose cont rol of theve hicle. #
Do not drive with a flat tire. #
Obse rveth e no tes on flat tires. In
fo rm ation about flat tires (/ page 294). #
Stop theve hicle in accordance with the tra ffic conditions. #
Check the tires. Display messages and
warning and indicator lamps 369
Display messages
Possible causes/consequences and 0050 0050Solutions
0077
Check Tires *T
he pressure in one or more tires has fallen significantl y.The wheel
position is shown. &
WARNING Risk of an accident due toinsuf ficient tire pres‐
sure
Ti re pressures that are too low pose thefo llowing hazards:
R The tires may bur st, especially as the load and vehicle speed
increase.
R The tires may wearexc essively and/or une venly, which may
greatly impair tire traction.
R The driving characteristics, as well as steering and braking,
may be greatly impaired.
Yo u could then lose cont rol of theve hicle. #
Obser vethere commended tire pressu re. #
Adjust the tire pressure if necessar y. #
Stop in accordance with the tra ffic conditions. #
Check the tire pressure (/ page310) and the tires.
0077
Please Correct Tire Pres-
sure *T
he pressure in at least one tire is too low or the pressures of the
individual tires deviate too much from each other. #
Check the tire pressure, and add air if necessar y. #
When the tire pressure has been set cor rectl y,re-sta rt the tire
pressure monitor (/ page316).
Tire Pressure Mo nitor
Inoperative *T
he tire pressure monitor is malfunctioning. #
Visit a qualified specialist workshop. Key
Display messages
Possible causes/consequences and 0050 0050Solutions
00AF
Don't Forget Your Key *T
his message reminds you not tolea veyour SmartK eyintheve hi‐
cle. #
Take the SmartK eywith you when youget out of theve hicle.
00AF
Place the Key in the
Marked Space See Oper-
ator's Manual *S
martK eydetection is malfunctioning. #
Change the SmartK ey's position in theve hicle. #
Start theve hicle with the SmartK eyinthe mar ked space
(/ page 110). 37 0
Displaymessa ges and warning and indicator lamps
Display messages
Possible causes/consequences and 0050 0050Solutions
00AF
Key Not Detected (red
display message) *T
he SmartK eyis not de tected and may no longer be in theve hicle.
The SmartK eyis no longer in theve hicle and you swit ch the engine
off:
R You can no lon gerst art the engine.
R You cannot lock theve hicle centra lly. #
Ensure that the SmartK eyis in theve hicle.
If th e SmartK eydetection function has a malfunction due to a
stro ngradio signal source, proceed as follo ws: #
Stop theve hicle immediately in accordance with the traf fic con‐
ditions. #
Place the SmartK eyinthe mar ked space forst arting with the
SmartK ey (/page 110).
00AF Key Not Detected (white
display messa ge) *T
he SmartK eyis cur rently not de tected. #
Change the SmartK ey's position in theve hicle. #
Ifth e SmartK eyisstill not de tected, start the engine with the
SmartK eyinthe mar ked space (/ page110).
00AF Replace Key Ba ttery*T
he SmartK ey's battery is discharged. #
Changing the battery (/ page47).
00AF Obtain a New Key *T
he SmartK eymust be replaced. #
Visit a qualified specialist workshop. Ve
hicle Display messages
Possible causes/consequences and 0050 0050Solutions
00B2
Check Washer Fluid *T
hewasher fluid le vel in thewa sher fluid reser voir has fallen below
th e minimum. #
Adding washer fluid (/ page 284).
003E *A
t least one door is open. #
Close all the doors.
f *T
he hood is open. Display messages and
warning and indicator lamps 371
Display messages
Possible causes/consequences and 0050 0050Solutions &
WARNING Risk of accident if the engine hood is unlatched
while driving
An unloc ked engine hood may open up when theve hicle is in
motion and block your vie w. #
Never unlatch the engine hood while driving. #
Before every trip, ensure that the engine hood is latched. #
Stop theve hicle immediately in accordance with the traf fic con‐
ditions. #
Close the hood.
003B
Inoperative See Opera-
tor’s Manual *T
hestationary heater is temp orarily malfunctioning. #
When theve hicle is at a standstill in a horizontal position and
th e engine has cooled down: try toswitch on thest ationary
heater four times, leaving a gap of se veral minutes between
each attem pt. #
Ifth est ationary heater does not swit chon: consult a qualified
specialist workshop.
003B
Inoperative Refuel Vehi-
cle *T
here is too little fuel in the fuel tank.The stationary heater cannot
be swit ched on. #
Refuel theve hicle.
003B
Inoperative Battery Low *T
he on-board electrical sy stem voltage is too lo w.
The stationary heater has swit ched off. #
Drive an extended di stance until the battery has been suf fi‐
ciently charge d again.
00CC
Steering Malfunction
Increased Physical Effort
See Operator's Manual *T
hesteering po wer assi stance is malfunctioning. &
WARNING Risk of an accident due toaltered steering char‐
acteristics
If th e po wer assi stance of thesteering fails partially or com‐
ple tely,yo u will need touse more forc eto steer. #
If safe steering is possible, drive on carefully. #
Visit or consult a qualified specialist workshop immedi‐
atel y. #
If safe steering is possible, drive on carefully. #
Visit or consult a qualified specialist workshop immediately.
00CC
Steering Malfunction
Stop Immediately See
Operator's Manual *T
hesteering is malfunctioning. Steerability is heavily impaired. &
WARNING Risk of accident if steering capability is impaired
If th esteering does not function as intended, theve hicle's oper‐
ating saf ety is jeopardized. 372
Displaymessa ges and warning and indicator lamps
Display messages
Possible causes/consequences and 0050 0050Solutions #
Pull over and stop theve hicle safely as soon as possible,
paying attention toroad and traf fic conditions. Do not con‐
tinue driving under any circums tances. #
Consult a qualified specialist workshop. #
Stop theve hicle immediately in accordance with the traf fic con‐
ditions. Do not continue driving. #
Consult a qualified specialist workshop.
Shift to 'P' or 'N' to Start
Engine *
Yo u ha veattem pted tostart the engine in transmission position 005B
or 005E. #
Shift the transmission toposition 005Dor005C.
To Engage Transmiss.
Position R First Depress
the Brake *
Yo u ha veattem pted toshift from position 005Bor005C toposition 005E. #
Depress the brake pedal. #
Shift the transmission toposition 005E.
Air Conditioning Malfunc-
tion See Operator's Man-
ual *T
he function of the climate cont rol sy stem is temp orarily restricted.
The quantity of air and flow of fresh air are contro lled automatically. #
Have the climate cont rol sy stem checked at a qualified specialist
wo rkshop.
Auxiliary Battery Mal-
function *T
he auxiliary batteryforth e transmission is no longer being
ch arge d. #
Visit a qualified specialist workshop. #
Until then, alw ays shift the transmission toposition 005Dmanually
before you swit choff the engine. #
Before leaving theve hicle, apply the parking brake.
Reversing Not Possible
Service Required *T
he transmission is malfunctioning. It is no longer possible toselect
re ve rsege ar. #
Visit a qualified specialist workshop.
Transmission Malfunc-
tion Stop *T
he transmission is malfunctioning. The transmission automatically
shifts toposition 005C. #
Stop theve hicle immediately in accordance with the traf fic con‐
ditions. #
Shift the transmission toposition 005D. #
Consult a qualified specialist workshop.
0072
Vehicle Operational
Switch the Ignition Off
Before Exiting *Y
ou are about toexitth eve hicle when it is in a ready-to-d rive state. #
When youex itth eve hicle, switch off the ignition and take the
ke y with you. #
Ifyo u do not exitth eve hicle, switch off the electrical consum‐
ers, e.g. the seat heating. Otherwise, the12 ‑V battery may dis‐
ch arge and it will be possible tostart theve hicle only with the
aid of a second battery (s tarting assis tance).
Service Required Do Not
Shift Gears Visit Dealer *T
he transmission is malfunctioning. The transmission position can
no longer be changed. Display messages and
warning and indicator lamps 373
Display messages
Possible causes/consequences and 0050 0050Solutions #
Ifth e transmission is in position 005B, visit aqualified specialist
wo rkshop, without changing the transmission position. #
For all other transmission positions, park theve hicle in a safe
location. #
Inform a qualified specialist workshop or breakdown service.
Only Shift to 'P' when
Vehicle is Stationary *
The transmission can only be shif tedto position 005Difth eve hicle is
at a standstill.
N Permanently Active
Risk of Rolling Away *W
hile theve hicle is rolling or driving, the transmission was shif ted
to position 005C. #
Tostop, depress the brake pedal and, when theve hicle is at a
st andstill, shift the transmission toposition 005D. #
Tocontinue your journe y,shift the transmission toposition 005B
or 005E.
Driver's Door Open &
Transmission Not in P
Risk of Vehicle Rolling
Away *T
he driver's door is not fully closed and the transmission is in posi‐
tion 005E,005Cor005B. #
When parking theve hicle, shift the transmission toposition 005D.
Apply Brake to Shift
from 'P' *Y
ou ha veattem pted toshift toa dif fere nt transmission position from
position 005D. #
Depress the brake pedal.
x Vehicle Tracker has
been activated. Details:
see manual or associ-
ated mobile app. or
Vehicle locating activa-
ted – see manual or
mobile app. *T
hevehicle features activated services from Mercedes PRO.
Locating theve hicle may be possible within the frame workof
Mercedes PRO connect. #
Check thest atus of the activated services at http://
mercedes.pro. #
Ask theve hicle owner forth e de tails.
g
Step Not Extended See
Operator's Manual or
Step Not Extended Mal-
function *T
he electrical step is not, or is only partially, extended. #
Ensu rethere is suf ficient clea rance forth e electrical step. #
Open or close the sliding door again. #
Ifth e electrical step does not comple tely ex tend again, push it in
manually (emergency release) (/ page 58). #
Inform passen gers that thestep is missing before they exitthe
ve hicle.
g
Step Not Retracted See
Operator's Manualor
Step Not Retracted Mal-
function *T
he electrical step is not, or is only partially, retracted. #
Ensu rethere is suf ficient clea rance forth e electrical step. #
Open or close the sliding door again. #
Ifth e electrical step does not comple tely retract again, push it in
manually (emergency release) (/ page 58). 374
Displaymessa ges and warning and indicator lamps