ECU MERCEDES-BENZ V-CLASS 2021 Manual Online

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Remo ve yo urfoot from the accelerator pedal. The limiter will be
re activated and will limit your speed.
Cruise control - - - km/h *An activation condition for cruise control has not been met.
Fo rex ample, you are aiming tostore a speed below 30 km/h. #
If conditions pe rmit, drive at a speed greater than 30 km/h and
store the speed. #
Obser vethe activation conditions for cruise control
(/ page 158).
Cruise control and Lim-
iter inoperative *A
warning tone also sounds. Cruise control and the limiter are mal-
functioning. #
Consult a quali/ed specialist workshop.
Blind Spot Assist not
available when towing a
trailer See Owner's Man-
ual *B
lind Spot Assist is switched o. during trailer operation. #
Ackno wledge the display message with thea steering wheel
button.
Blind Spot Assist inoper-
ative *B
lind Spot Assist is malfunctioning. #
Consult a quali/ed specialist workshop.
Blind Spot Assist cur-
rently unavailable See
Owner's Manual *B
lind Spot Assist is temp orarily non-operational.
The following causes are possible:
R The function is impaired due toheavy rain or sno w.
R The radar sensor system is temp orarily non-operational, e.g. due
to electromagnetic radiation close toTV orradio transmitting sta-
tions or other sources of radiation.
R The system is outside the operating temp erature range.
If th e causes mentioned abo veno longer app ly,th e display message
will disappear and Lane Keeping Assist will be operational again.
If th e display message does not disappear: #
Stop in accordance with the tra1c conditions. #
Secure theve hicle against rolling away. #
Switch o. theve hicle. #
Restart theve hicle.
à --- km/h *D
SR has been switched on but is not active as you are driving at a
speed greater than 18 km/h. If you drive at a speed below 18 km/h,
DSR will automatically brake again tothe set speed.
Ã
Off *D
SRwas deacti vated.
If it was not deacti vatedby the driver, e.g. due toa malfunction of the
ESP ®
, a warning tone also sounds. 292 292
Display messa
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à inoperative *A
warning tone also sounds. DSR is una vailable due toa malfunction. #
Consult a quali/ed specialist workshop.
Active Parking Assist
cancelled *A
n acoustic signal sounds as well. The active parking assistance sys-
te ms ha vebeen cancelled and Active Parking Assist will automatically
be abor ted. You ha vetouched the steering wheel, forex ample, or
ha ve driven at too high a speed. #
Steer and brake manuall y. #
Repeat the parking procedure if necessar y.Comply with the deac-
tivation conditions (/ page 170).
Active Parking Assist
inoperative *P
ARKTRONIC is malfunctioning or defecti ve. #
Comply with the inst ructions and aids in "Function of
PA RKTRONIC"(/ page 165). #
Ifth e display message continues tobe displa yed, consult a quali-
/ed specialist workshop:
*A ctive Parking Assist is not available or is malfunctioning. #
Switch o. theve hicle, wait a short while, then switch it on again.
If th e display message continues tobe displa yed, or if the display does
not show thej symbol: #
Consult a quali/ed specialist workshop.
Lane Keeping Assist
inoperative *L
ane Keeping Assist is malfunctioning. #
Consult a quali/ed specialist workshop.
Lane Keeping Assist cur-
rently unavailable See
Owner's Manual *L
ane Keeping Assist has been switched o. and is temp orarily non-
operational.
The following causes are possible:
R The windscreen is dirty in the camera's /eld of vision.
R Visibility is impaired due toheavy rain, snow or fog.
R Lane markings are absent for a long period of time.
R The lane markings are worn, dark or co veredby dirt or sno w,for
ex ample.
If th e causes mentioned abo veno longer app ly,th e display message
will disappear and Lane Keeping Assist will be operational again.
If th e display message does not disappear: #
Stop in accordance with the tra1c conditions. #
Secure theve hicle against rolling away. #
Clean the windscreen.
Traffic Sign Assist inoper-
ative *
Tra1c Sign Assist is malfunctioning. #
Consult a quali/ed specialist workshop.
Traffic Sign Assist cur-
rently unavailable See
Owner's Manual *
Tra1c Sign Assist has been switched o. and is temp orarily non-
operational. Display messages and
warning and indicator lamps
293 293

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The following causes are possible:
R The windscreen is dirty in the camera's /eld of vision.
R Visibility is impaired due toheavy rain, snow or fog.
If th e causes mentioned abo veno longer app ly,th e display message
will disappear and Tra1c Sign Assist will be operational again.
If th e display message does not go out: #
Stop in accordance with the tra1c conditions. #
Secure theve hicle against rolling away. #
Clean the windscreen.
ë
Off *T
he HOLD function has been deacti vated. The vehicle has star ted
skidding.
A wa rning tone also sounds. #
Switch the HOLD function on again later (/ page 164).
*T he HOLD function has been deacti vated. An activation condition will
no longer be met when the brake pedal is depressed.
A wa rning tone also sounds. #
Che ckthe activation conditions of the HOLD function
(/ page 164).
Â
Lowering *
The vehicle le vel may be lo weredfo rth efo llowing reasons:
R You ha veselected a di.erent drive prog ram.
R You ha veexceeded the speed limit.
Á Vehicle rising *
The vehicle le vel may be raised forth efo llowing reasons:
R You ha veselected a di.erent drive prog ram.
R You ha vefallen below the speed limit.
Á
Compressor is cooling *D
uetofrequent le velch anges within a short space of time, the com-
pressor /r stneeds tocool down toenable the selected driving le velto
be set.
When the compressor has cooled down, theve hicle will continue ris-
ing tothe selected vehicle le vel. #
Drive on in a manner appropriate forth e cur rent le vel. Make sure
th at there is su1cient ground clearance.
ä
Malfunction See Own-
er's Manual *A
IRM ATIC is functioning only toa limi tedex tent. The vehicle's han-
dling characteristics may be a.ected.
* N
NO OTE TE The tyres on the front axle or thefe nders could be
damaged bylarge stee ring mo vements #
Avoid lar gestee ring mo vements while driving and lis tenfor
scraping sounds. #
Ifyo u hear scraping sounds, pull over and stop theve hicle in
accordance with the tra1c conditions, and set a higher vehi-
cle le vel if possible. 294
294
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Drive in a manner appropriate forth e cur rent le vel, but do not
ex ceed 80 km/h. #
Consult a quali/ed specialist workshop. Engine
Engine
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# See Owner's Manual *A
warning tone also sounds.
The bat tery is no longer being charge dfo r one of thefo llowing rea-
sons:
R defecti vealternator
R torn pol y-V belt
R malfunction in the electronics #
Stop theve hicle immediately in accordance with the tra1c condi-
tions and switch it o..
Do not continue driving. If you do, the engine may overheat. #
Secure theve hicle against rolling away. #
Consult a quali/ed specialist workshop.
! Clean the fuel filter *T
here is water in the fuel /lter. The water must be drained o.. #
Consult a quali/ed specialist workshop.
? Coolant Stop vehicle
Switch engine off *A
warning tone also sounds. The coolant is too hot. &
W WARNING
ARNING Risk of burns when opening the bonnet
If yo u open the bonnet in theev ent of an overheated engine or /re
in the engine compartment, thefo llowing situations may occur:
R You may come into contact with hot gases.
R You may come into contact with other escaping hot operating
0uids. #
Before opening the bonnet, allow the engine tocool down. #
Intheev ent of a /re in the engine compartment, keep the
bonnet closed and call the /re service. &
W
WARNING
ARNING Risk of scalding from hot coolant
If yo u open the cap, you could be scalded. #
Letthe mo tor cool down before opening the cap. #
When opening the cap, wear pr otective glo ves and saf ety
glasses. #
Open the cap slo wlytorelease pressure. #
Stop theve hicle immediately in accordance with the tra1c condi-
tions and switch it o.. Display messages and
warning and indicator lamps
295
295

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4 Engine oil level Stop vehi-
cle Switch engine off *T
he oil le vel is too lo w.There is a risk of engine damage. #
Stop theve hicle immediately in accordance with the tra1c condi-
tions and switch it o.. #
Secure theve hicle against rolling away. #
Check the oil le vel (/ page 226). #
If necessar y,top up the engine oil (/ page 227).
6 Reserve fuel level *T
he fuel supply has dropped into there ser verange.
Ope ration of the auxiliary heating (stationary heater) is deactivated in
th ere ser verange. #
Refuel theve hicle.
Ï *T
here is very little fuel in the fuel tank. #
It is absolutely essential torefuel at the nearest /lling station. A A
dBlue
dBlue ®
® Displa
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Ø
Refill AdBlue See Own-
er’s Manual *
Awa rning tone also sounds. The AdBlue ®
leve l has fallen below the
re ser verange. #
Top up with AdBlue ®
as soon as possible (/ page 148).
Ø Refill AdBlue Emer. oper.
in XXX km See Owner's
Manual *
Awa rning tone also sounds. The AdBlue ®
leve l is su1cient only for
th e distance displa yed. If you subsequently start the engine again, you
will be able todrive theve hicle only at a maximum speed of 20 km/h
fo rth e distance shown. Engine management will then pr event the
engine from starting. #
Top up with AdBlue ®
immediately (/ page 148).
Ø
Limp-home mode: 20
km/h No start ... km
See Owner's Manual. *
Awa rning tone also sounds. The AdBlue ®
tank is em pty. Yo u can drive
th e distance shown at a maximum speed of 20 km/h. If you subse-
qu ently switch o. the engine, the engine management system will
pr eve ntthe engine from being star ted again. You will then be able to
start the engine only once you ha vere/lled theAd Blue ®
tank. #
Stop theve hicle in accordance with the tra1c conditions. #
Top up with AdBlue ®
immediately (/ page 148).
Ø
Refill AdBlue Start not
possible *
Awa rning tone also sounds. The AdBlue ®
tank is em pty. Yo u can no
longer start the engine. #
Top up with at least 8 l AdBlue ®
(/ page 148). #
Turn theke yto position 2inthe ignition lock and waitfor
appr oximately one minute.
The engine can be restar ted once the engine management has
de tected the new le vel. Display message
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297 297

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Yo u could then lose control of theve hicle. #
Obser vethere commended tyre pressures. #
Adjust the tyre pressure if necessar y. #
Stop theve hicle without steering or braking sudden ly.Pa y atten-
tion tothe tra1c conditions. #
Secure theve hicle against rolling away. #
Check the tyres. If necessar y,replace the wheel (/ page 261). #
Check the tyre pressure (/ page 258). Correct the tyre pressure
as necessar y.
Warning tyre defect *The tyre pressure in one or more tyres has dropped sudden ly.&
W
WARNI NG
ARNI NGRisk of an accident from driving with a 0at tyre
R The tyres can overheat and cause a /re.
R The driving characteristics as well as the steering and braking
may be greatly impaired.
Yo u could then lose control of theve hicle. #
Do not drive on with a 0at tyre. #
Obser vethe no tes on 0at tyres. #
Stop theve hicle without steering or braking sudden ly.Pa y atten-
tion tothe tra1c conditions. #
Secure theve hicle against rolling away. #
Check the tyres. If necessar y,replace the wheel (/ page 261).
Tyre press. monitor cur-
rently unavailable *D
uetoa source of radio inter fere nce, no signals from the tyre pres-
sure sensors are being received. The tyre pressure monitoring system
is temp orarily malfunctioning.
The tyre pressure monitoring system will restart au tomatically as soon
as the cause has been recti/ed.
Wheel sensor(s) missing *There is no signal from the tyre pressure sensor of at least one tyre.
The display is not showing any pressure value forth e tyre in question. #
Have thefa ulty tyre pressure sensor replaced at a quali/ed spe-
cialist workshop.
Tyre pressure monitor
inoperative No wheel
sensors *T
he wheels /tted do not ha vesuitable tyre pressure sensors. The tyre
pressure moni toring system is deactivated. #
Fit wheels with suitable tyre pressure sensors.
The tyre pressure monitoring system will switch on aTer a few
minutes of driving.
Tyre pressure monitor
inoperative *T
he tyre pressure moni toring system is malfunctioning. #
Consult a quali/ed specialist workshop. Display messages and
warning and indicator lamps
299
299

K
K
e
ey
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 Key does not belong to
vehicle *Y
ou ha veinser ted an incor rect key in tothe ignition loc k. #
Use the cor rect key.
 Remove key *T
hekey is in the ignition loc k. #
Remo vethekey.
Â
Replace key *T
hekey needs tobe replaced. #
Consult a quali/ed specialist workshop.
 Change key batteries *T
hekey battery is dischar ged. #
Replace the battery (/ page 52). V V
ehicle
ehicle Displa
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Clutch overheated Avoid
pulling away Engage/
disengage clutch quickly
if req. *A
warning tone also sounds. The clutch is under heavy load and the
permissible operating temp erature of the clutch has been exceeded.
Av oid frequent pulling away and driving at walking pace overex tended
distances. #
Stop in accordance with the tra1c conditions. #
Secure theve hicle against rolling away. #
Leavethe engine running.
The clutch will cool more quickly when the engine is running.
or #
If possible, continue driving at a steady speed. #
Remo ve yo urfoot from the clutch pedal and do not let the clutch
slip.
The clutch may also cool down during driving.
Cooling down can take afew minutes. When the clutch has cooled
down, the display message will disappear and the clutch will be fully
operational again.
Ò *T
hetailgate is open. #
Close theta ilgate. 300 300
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Ó *A
warning tone also sounds. The bonnet is open. &
W
WARNI NG
ARNI NGRisk of accident due todriving with the bonnet
unloc ked
The bonnet may open and blo ckyour vie w. #
Neverre lease the bonnet when driving. #
Before every trip, ensure that the engine bonnet is loc ked. #
Stop theve hicle immediately in accordance with the tra1c condi-
tions. #
Secure theve hicle against rolling away. #
Close the bonnet.
C *I
n addition, a warning tone sounds during the trip.
The display sho ws the open door or doors. #
Close all the doors.
¥
Top up washer fluid *T
hewasher 0uid le vel in thewa sher 0uid reser voir has dropped below
th e minimum. #
Top up thewa sher 0uid (/ page 229).
Ð Power steering malfunc-
tion See Owner's Manual *A
warning tone also sounds. The po wer assistance forth e steering
could be malfunctioning. You may need tosteer mo reforc efull y. #
Carefully continue toaqu ali/ed specialist workshop and ha vethe
stee ring checked immediatel y.
Telephone No service *Your vehicle is outside the transmission and receiver range of the
mobile phone network pr ovider.
To start engine, shift to
either P or N *Y
ou ha veattem pted tostart theve hicle in transmission position kor
h. #
ShiT the transmission toposition jori.
Auxiliary battery malfunc-
tion *T
he auxiliary battery forth e transmission is no longer being charge d. #
Consult a quali/ed specialist workshop.
Apply brake to deselect
Park (P) position *Y
ou ha vetried toshiT the transmission toposition h,kori with-
out applying the brake. #
Depress the brake pedal.
Apply brake to select R *You ha vetried toshiT the transmission toposition kwithout appl y-
ing the brake. #
Depress the brake pedal. #
ShiT the transmission position tok .
N permanently active
Risk of vehicle rolling *A
warning tone also sounds. While theve hicle is rolling or driving, the
transmission was shiTed toposition i. #
Tostop, depress the brake pedal and, when theve hicle is at a
standstill, shiT the transmission toposition j. Display messages and
warning and indicator lamps
301 301

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Tocontinue your journe y,shiT the transmission toposition kor
h.
Risk of vehicle rolling
Vehicle not in P *A
warning tone also sounds. The driver's door is open and the trans-
mission is in position i,korh. #
ShiT the transmission toposition j. #
Secure theve hicle against rolling away.
Without changing gear,
consult workshop *A
warning tone also sounds. You can no longer change the transmis-
sion position due toa malfunction.
If transmission position hhas been selected: #
Without changing the transmission position, consult a quali/ed
specialist workshop.
If transmission position j,kori has been selected: #
Inform a quali/ed specialist workshop.
Reversing not poss. Con-
sult workshop *T
he transmission is malfunctioning. Transmission position kcann ot
be selected. #
Inform a quali/ed specialist workshop.
Transmission Malfunc-
tion Stop *T
he transmission is malfunctioning. The transmission automatically
switches toneutral i. #
Stop theve hicle immediately in accordance with the tra1c condi-
tions. #
ShiT the transmission toposition j. #
Inform a quali/ed specialist workshop.
Stop vehicle Leave
engine running Wait
Transmission cooling *T
he transmission is overheating. Pulling away may be temp orarily
impaired or not possible. #
Stop theve hicle immediately in accordance with the tra1c condi-
tions. Do not continue driving! #
Leavethe engine running. #
Wait until the display message disappears before pulling away.
&
inoperative Battery low *T
he on-board elect rical system voltage is too lo w.The hot-water auxili-
ary hea ter (stationary heater) has switched itself o. or cannot be
switched on. #
Drive for an extended distance.
The bat tery will be charge d. The hot-water auxiliary heater (sta-
tionary heater) will be operational again as soon as the on-board
electrical system voltage is su1cient.
& inoperative Refuel vehi-
cle *T
here is too little fuel in the fuel tank. The hot-water auxilia ryheater
(stationary heater) cann otbe switched on. #
Refuel theve hicle. 302 302
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WARNING
ARNING Risk of skidding if EBD, ABS and ESP ®
are malfunc-
tioning
The wheels may block during braking and ESP ®
does not per form
any vehicle stabilization.
The steerability and braking characteristics are heavily impaired and
th e braking distance may increase. In addition, other driving saf ety
systems are switched o.. #
Drive on carefull y. #
Have the brake system checked immediately at a quali/ed
specialist workshop. #
Switch o. theve hicle, wait a short while, then switch it on again. #
Check whe ther the display message has disappeared and ESP ®
is
operational.
If th e display message continues tobe shown: #
Drive on carefull y. #
Consult a quali/ed specialist workshop immediatel y.
J Brake system warning
lamp *The
red brake system warning lamp is on while theve hicle is on. A
wa rning tone also sounds.
The brake forc e boosting is malfunctioning. &
W
WARNING
ARNING Risk of accident and injury if brake forc e boosting is
malfunctioning
If brake forc e boosting is malfunctioning, increased brake pedal
fo rc e may be necessary for braking. The braking characteristics
may be impaired. The braking dis tance can increase in eme rgency
braking situations. #
Stop in a safe location immediatel y.Do not continue driving! #
Consult a quali/ed specialist workshop. #
Secure theve hicle against rolling away.
J Brake system warning
lamp *T
he red brake system warning lamp is on while theve hicle is on.
There is insu1cient brake 0uid in the brake 0uid reser voir. &
W
WARNING
ARNING Risk of an accident due tolow brake 0uid le vel
If th e brake 0uid le vel is too lo w,the braking e.ect and the braking
ch aracteristics may be impaired. #
Stop theve hicle as soon as possible, paying attention toroad
and tra1c conditions. Do not continue driving. #
Consult a quali/ed specialist workshop. #
Do not top up the brake 0uid. #
Secure theve hicle against rolling away. Display messages and
warning and indicator lamps
305
305