2021 MERCEDES-BENZ C-CLASS CABRIOLET engine

Display messages
Possible causes/consequences and M
MSolutions &
WARNING Risk of bu rns when opening the bonn et
If yo u open the bonn etwhen the engine has overheated or when there is a fire inthe engine compartment, the
fo llowing situations may occur:
R You could come into contact with hot gases.
R You could come into contact with other hot, escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the bonn etclosed and call thefire service. #
Wait until the engine has cooled down. #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120°C.
ÿ *T
hefan mo tor is defective. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120 °C. Displ
aymessa ges and warning/indicator lamps 447

Display messages
Possible causes/consequences and M
MSolutions
8 Reserve fuel level *T
he fuel supply has dropped into there ser verange. #
Refuel.
!
Clean the fuel filter *
Ve hicles with diesel engines: the fuel filter is dirty or thewate r inthe fuel filter needs tobe drained. #
Consult a qualified specialist workshop.
¸ Replace air cleaner *
Ve hicles with diesel engines: the engine air filter is dirty and must be replaced. #
Consult a qualified specialist workshop. Tr
ansmission Display messages
Possible causes/consequences and M
MSolutions
Only select Park (P) when
vehicle is stationary *
It is possible toselect the park position jonly if theve hicle is stationar y. #
Tostop, depress the brake pedal. 448
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions #
Shift the transmission topark position jwhen theve hicle is stationar y.
Apply brake to deselect
Park (P) position *
Yo u ha veattem ptedto shift the transmission out of park position jand into ano ther transmission position. #
Depress the brake pedal. #
Select transmission position h,kor neutral i.
To shift out of P or N,
depress brake and start
engine *
Yo u ha veattem ptedto shift the transmission out of park position jor neutral iand into ano ther transmission
position. #
Depress the brake pedal. #
Start theve hicle. #
Change the transmission position.
Apply brake to select R *
You ha veattem ptedto select transmission position k. #
Depress the brake pedal. #
Select transmission position k.
Risk of vehicle rolling
Driver door open and trans-
mission not in P *
The driver's door is not fully closed and transmission position h,kor neutral iis selected.
The vehicle may rollaw ay. #
Select pa rkposition jwhen switching off theve hicle.
N permanently active Risk
of vehicle rolling *
While theve hicle is rolling or while you are driving, neutral ihas been en gage d. #
Tostop, depress the brake pedal. Display messages and
warning/indicator lamps 449

Display messages
Possible causes/consequences and M
MSolutions #
Shift the transmission topark position jwhile theve hicle is stationar y. #
Tocontinue driving, select transmission position hork.
Without changing gear,
consult workshop *T
he transmission is malfunctioning. It is no longer possible tochange the transmission position. #
If transmission position his selected, consult a qualified specialist workshop and do not change the transmis‐
sion position. #
For all other transmission positions, park theve hicle safely. #
Consult a qualified specialist workshop.
Reversing not poss. Con-
sult workshop *
The transmission is malfunctioning. It is not possible toselect transmission position k. #
Consult a qualified specialist workshop.
Transmission Malfunction
Stop *
The transmission is malfunctioning. The transmission shifts toneutral iautomatically. #
Stop theve hicle immediately in accordance with the traf fic conditions. #
Depress the brake pedal. #
Enga gepark position j. #
Consult a qualified 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 traf fic conditions. Do not continue driving. #
Lea vethe engine running. #
Wait until the display message disappears before pulling away. 450
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
Auxiliary battery malfunc-
tion (white display mes‐
sage) *T
he auxiliary batteryforth e transmission is no longer being charge d. #
Consult a qualified specialist workshop. #
Untilthen, alw ays select park position jmanually before you swit choff the engine. #
Before leaving theve hicle, apply the electric parking brake.
Auxiliary battery malfunc-
tion (red display message) *T
he auxiliary batteryforth e transmission is no longer being charge d. #
Consult a qualified specialist workshop. #
Untilthen, alw ays select park position jmanually before you swit choff the engine. #
Before leaving theve hicle, apply the electric parking brake. Brakes
Display messages
Possible causes/consequences and M MSolutions
! Parking brake See Owner's
Manual *
The yellow ! indicator lamp is lit. The elect ric pa rking brake is malfunctioning.
To appl y: #
Switch the ignition off and switch it back on. #
Apply the electric parking brake manually (/ page166).
If it is not possible toapply the electric parking brake: #
Consult a qualified specialist workshop. Display messages and
warning/indicator lamps 451

Display messages
Possible causes/consequences and M
MSolutions
Traffic Sign Assist inopera-
tive *T
raffic Sign Assist is malfunctioning. #
Stop theve hicle in accordance with the tra ffic conditions and restart the engine. #
Ifth e display message still appears, consult a qualified specialist workshop.
Traffic Sign Assist Camera
view restricted See Own-
er's Manual *T
he camera view is restricted. Possible causes:
R Dirt on the windscreen in the camera's field of vision
R Heavy rain, snow or fog
Driving sy stems and driving saf ety sy stems may be malfunctioning or temp orarily una vailable.
Once the cause of the problem is no longer present, the driving sy stems and driving saf ety sy stems will be available
again.
If th e display message does not disappear: #
Stop theve hicle in accordance with the tra ffic conditions. #
Clean the windscreen.
Blind Spot Assist currently
unavailable See Owner's
Manual *B
lind Spot Assist is temp orarily una vailable.
The sy stem limits ha vebeen reached (/ page195).
Once the cause of the problem is no longer present, the sy stem will be available again. #
Drive on.
or Display messages and
warning/indicator lamps 461

Display messages
Possible causes/consequences and M
MSolutions #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra ffic conditions and restart
th e engine. #
If necessar y,clean there ar bumper. If the bumper is especially dirty, the sensors in the bumper may be mal‐
functioning.
Blind Spot Assist inopera-
tive *B
lind Spot Assist is malfunctioning. #
Consult a qualified specialist workshop.
Blind Spot Assist not availa-
ble when towing a trailer
See Owner's Manual *W
hen you es tablish the electrical connection tothe trailer, Blind Spot Assist will be una vailable. #
Press the left-hand Touch Control and ackn owledge the display message.
Active Blind Spot Assist
currently unavailable See
Owner's Manual *A
ctive Blind Spot Assi stistemp orarily una vailable.
The sy stem limits ha vebeen reached (/ page195).
Once the cause of the problem is no longer present, the sy stem will be available again. #
Drive on.
or #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra ffic conditions and restart
th e engine.
Active Blind Spot Assist
inoperative *A
ctive Blind Spot Assi stis malfunctioning. #
Consult a qualified specialist workshop. 462
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
É Vehicle rising *Y
our vehicle is adjusting tothe le velyo u ha veselected.
É Vehicle rising Please wait *T
hevehicle le vel is too lo w.The vehicle will be raised tothe selected vehicle le vel. #
Wait until the display message disappears before pulling away.
É Please reduce speed *Y
ou are driving toofast forth e selected vehicle le vel. #
Toadjust theve hicle le vel,yo u must not drive at speeds greaterth an 60 km/h. #
Toadjust theve hicle le vel during trailer operation, you must not drive at speeds greaterth an 30 km/h.
Parking Assist Manoeu-
vring assistance limited
See Owner's Manual *T
heParking Assist manoeuvring assis tant is temp orarily una vailable or only partially available. #
Clean all sensors of the parking and camera sy stem (/ page 368). #
Ifth e display message still appears, consult a qualified specialist workshop.
Parking Assist and
PARKTRONIC inoperative
See Owner's Manual *
Ve hicles with Active Parking Assis t:Ac tive Parking Assist and Parking Assist PARKTRONIC are malfunctioning.
Ve hicles without Active Parking Assis t:Pa rking Assist PARKTRONIC is malfunctioning. #
Stop theve hicle in accordance with the tra ffic conditions and restart the engine. 466
Display messages and warning/indicator lamps