2015 MERCEDES-BENZ C-CLASS COUPE Owners Manual

Safety systems
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions J
N
The yellow brake system warning lamp lights up while the engine is running or
the ECO start/stop function is activated.
G WARNING
The brake system is malfunctioning and the braking characteristics may be affec- ted.
There is arisk of an accident.
X If the multifunction display shows adisplay message, please observe this.
X Drive on carefully.
X Consult aqualified specialist workshop immediately. J
N
The red brake system warning lamp is lit while the engine is running.
Aw arning tone also sounds.
G WARNING
The brake boosting effect is malfunctioning and the braking characteristics may be
affected.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances.
X Safeguard the vehicle against rolling away (Y page 172).
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction display. J
N
The red brake system warning lamp is lit while the engine is running.
Aw arning tone also sounds.
There is insufficient brake fluid in the brake fluid reservoir.
G WARNING
Braking efficiency may be impaired.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances.
X Safeguard the vehicle against rolling away (Y page 172).
X Do not top up the brake fluid. Topping up will not rectify the fault.
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction display. 286
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
MSolutions !
N
The yellow ABS warning lamp is lit while the engine is running.
ABS (Anti-lock Braking System) is faulty.
An additiona lwarning tone indicates that EBD (electronic brake force distribution)
is faulty.
Other driving and driving safety systems may alsobef aulty.
G WARNING
The brake system continues to function normally, but without the functions listed above. The front and rear wheels coul dtherefore lock, for example, if you brake
hard.
The steerability and braking characteristics may be severely affected. The braking
distance may increas einanemergency braking situation.
If ESP ®
is not operational ,ESP ®
is unable to stabilise the vehicle.
There is an increased dange rofskidding and risk of an accident.
X Observe the additiona ldisplay messages in the multifunction display.
X Drive on carefully.
X Consult aqualified specialist worksho pimmediately.
If the ABS control unit is faulty, there is alsoap ossibility that other systems,such
as the navigation system or the automatic transmission, willbeu navailable.J÷
!
N
The red brake system warning lamp and the yellow ESP ®
and ABS warning lamps
light up while the engine is running.
ABS and ESP ®
are faulty.
Other driving and driving safety systems may alsobef aulty.
G WARNING
The brake system continues to function normally, but without the functions listed above. The front and rear wheels coul dtherefore lock, for example, if you brake
hard.
The steerability and braking characteristics may be severely affected. The braking
distance may increas einanemergency braking situation.
If ESP ®
is not operational ,ESP ®
is unable to stabilise the vehicle.
There is an increased dange rofskidding and risk of an accident.
X Observe the additiona ldisplay messages in the multifunction display.
X Drive on carefully.
X Consult aqualified specialist worksho pimmediately. Warning and indicator lamps in the instrument cluster
287On-board computer and displays Z

Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
M Solutions ÷
N
The yellow ESP ®
warning lamp flashes while the vehicl eisinmotion.
ESP ®
or traction control has intervened because there is arisk of skidding or at
least one whee lhas started to spin.
Cruise control or DISTRONIC PLUS is deactivated.
X Only depress the accelerator peda lasfar as necessary when pulling away.
X Accelerate more gently while the vehicl eisinmotion.
X Adapt yourd riving style to suitt he road and weather conditions.
X Do not deactivate ESP ®
.
In rare cases it may be better to deactivate ESP ®
:
R all vehicles except Mercedes-AMG vehicles (Y page72)
R Mercedes-AMG vehicles (Y page73)
Observe the important safety notes on ESP ®
(Y page7 2). ÷
N
The yellow ESP ®
warning lamp is lit while the engine is running.
ESP ®
is faulty.
Other driving and driving safety systems may alsobef aulty.
G WARNING
The brake system continues to function normally, but without the functions listed above.
The braking distance may thus increas einanemergency braking situation.
If ESP ®
is not operational ,ESP ®
is unable to stabilise the vehicle.
There is an increased dange rofskidding and risk of an accident.
X Observe the additiona ldisplay messages in the multifunction display.
X Drive on carefully.
X Consult aqualified specialist worksho pimmediately. 288
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
MSolutions å
N
The yellow ESP ®
OFF warning lamp is lit while the engine is running or the ECO
start/stop function is activated.
ESP ®
is deactivated.
G WARNING
If ESP ®
is deactivated, ESP ®
is unable to stabilise the vehicle.
Further driving systems or driving safety systems are thus restricted, e.g. Active
Blind Spot Assist. The system does not perform braking actions.
There is an increased dange rofskidding and risk of an accident.
X Reactivate ESP ®
.
In rare cases it may be better to deactivate ESP ®
:
R all vehicles except Mercedes-AMG vehicles (Y page72)
R Mercedes-AMG vehicles (Y page73)
Observe the important safety notes on ESP ®
(Y page7 2).
X Adapt yourd riving style to suitt he road and weather conditions.
If ESP ®
cannot be activated:
X Drive on carefully.
X Contact aqualified specialist worksho pimmediatel yand have the ESP ®
system
checked. M
N
Mercedes-AMG vehicles only:
The yellow SPORT handling mode warning lamp is lit while the engine is running.
SPORT handling mode is activated.
G WARNING
When SPORT handling mode is activated, ESP ®
is unable to stabilise the vehicle.
There is an increased dange rofskidding and risk of an accident.
X Only switch to SPORT handling mode in accordance with the conditions descri-
bed in the "Activating/deactivating ESP ®
"s ection (Y page73). Warning and indicator lamps in the instrument cluster
289On-board computer and displays Z

Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
M Solutions !
N
The red indicator lamp for the electric parking brake flashes or is lit and/or the
yellow warning lamp for the electric parking brake is lit.
X Observe the additiona ldisplay messages in the multifunction display. 6
N
The red restraint system warning lamp is lit while the engine is running.
The restraint system is faulty.
G WARNING
The airbags or beltt ensioners may either be triggere dunintentionally or, in the
event of an accident, may not be triggered.
This poses an increased risk of injury.
X Observe the additiona ldisplay messages in the multifunction display.
X Drive on carefully.
X Contact aqualified specialist worksho pimmediatel yand have the restraint sys-
tem checked.
For further information about the restraint system, see (Y page39). Engine
Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
M Solutions ;
N
The yellow engine diagnostics warning lamp lights up while the engine is run-
ning.
There may be afault, for example:
R in the engine management
R in the fuel injection system
R in the exhaust system
R in the ignitio nsystem (for vehicles with petrol engines)
R in the fuel system
The emission limi tvalues may be exceede dand the engine may be running in
emergency mode.
X Consult aqualified specialist worksho pimmediately.
Vehicles with adiesel engine: the fuel tank has been run dry (Y page169).
X Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emergency running
mode is cancelled. The vehicl eneed not be checked. 8
N
The yellow reserve fuel warning lamp is on while the engine is running.
The fuel leve lhas dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel leve ldrops into the
reserve range.
X Refuel at the neares tfilling station. 290
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
MSolutions ?
N
The red coolant warning lamp lights up while the engine is running and the
coolant temperature gauge is at the start of the scale.
The temperature sensor for the coolant temperature gauge is faulty.
The coolant temperature is no longer being monitored .There is arisk of engine
damage if the coolant temperature is too high.
X Stop the vehicl eimmediately, paying attention to road and traffic conditions,
and switch off the engine. Do not continue driving under any circumstances.
X Safeguard the vehicl eagainst rolling away( Ypage1 72).
X Consult aqualified specialist workshop. Warning and indicator lamps in the instrument cluster
291On-board computer and displays Z

Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
M Solutions ?
N
The red coolant warning lamp comes on while the engine is running.
The coolant leve listoo low.
If the coolant leve liscorrect, the airflow to the engine radiator may be blocked or
the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being coole dsufficiently.
X Observe the additiona ldisplay messages in the multifunction display.
X Stop the vehicl eimmediately, paying attention to road and traffic conditions,
and switch off the engine.
X Safeguard the vehicl eagainst rolling away( Ypage1 72).
X Leave the vehicl eand keep asafe distance from the vehicl euntil the engine has
coole ddown.
X Check the coolant leve land top up the coolant, observing the warning notes
(Y page3 24).
X If you have to top up the coolant frequently, have the engine cooling system
checked.
X Make sure that the air supply to the engine radiator is not blocked ,e.g. by frozen
slush.
X Do not start the engine again until the coolant temperature is below 120 †. The
engine may otherwise be damaged.
X Drive to the neares tqualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-start traffic. ?
N
The red coolant warning lamp comes on while the engine is running. Awarning
tone alsos ounds.
The coolant temperature has exceede d120 †. The airflow to the engine radiator
may be blocked or the coolant leve lmay be too low.
G WARNING
The engine is not being coole dsufficiently and may be damaged.
Never drive with an overheated engine. Driving when youre ngine is overheated
can caus esome fluids which may have leaked into the engine compartment to
catch fire.
In addition, steam from an overheated engine can caus eserious burns, which can
occur just by opening the bonnet.
There is arisk of injury.
X Observe the additiona ldisplay messages in the multifunction display.
X Stop the vehicl eimmediately, paying attention to road and traffic conditions,
and switch off the engine.
X Safeguard the vehicl eagainst rolling away( Ypage1 72).
X Leave the vehicl eand keep asafe distance from the vehicl euntil the engine has
coole ddown.
X Check the coolant leve land top up the coolant, observing the warning notes
(Y page3 24).
X If you have to top up the coolant frequently, have the engine cooling system
checked. 292
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
MSolutions X
Make sure that the air supply to the engine radiator is not blocked ,e.g. by frozen
slush.
X If the coolant temperature is below 120 †, you can continue driving to the
neares tqualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-start traffic. Driving systems
Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
MSolutions ·
N
The red distance warning lamp lights up while the vehicl eisinmotion.
The distance to the vehicl einfront is too smal lfor the spee dselected.
X Increase the distance. ·
N
The red distance warning lamp lights up while the vehicl eisinmotion.Awarning
tone alsos ounds.
You are approaching avehicle, apedestrian or astationary obstacl einyourline of
travel at too high aspeed.
X Be prepared to brake immediately.
X Pay carefu lattention to the traffic situation. You may have to brake or take
evasive action.
Further information on PRE ‑SAFE®
Brake (Y page75).
For further information on the distance warning function of COLLISION PREVEN-
TION ASSIST PLUS, see (Y page69). Warning and indicator lamps in the instrument cluster
293On-board computer and displays Z