Page 369 of 498

368 Practical hintsWhat to do if …Display message
Possible cause/consequence
Possible solution
ESP
Malfunction
Visit workshop
The ESP
® has detected a malfunc-
tion and switched off.
The ABS may not be operational.
The electro-hydraulic brake system
is still functioning normally but with-
out the ESP® available.
Continue driving with added caution.
Have the system checked at an authorized
Mercedes-Benz Center as soon as possible.
Failure to follow these instructions increases the
risk of an accident.
unavailable
See Operator’s Manual
The ESP
® is deactivated because the
power supply was interrupted.
The electro-hydraulic brake system
is still functioning normally but with-
out the ESP® available.
Synchronize the ESP
®. With the vehicle sta-
tionary, turn the steering wheel completely to
the left and then to the right to synchronize the
ESP
®.
If the ESP
® message does not go out:
Continue driving with added caution.
Have the system checked at an authorized
Mercedes-Benz Center as soon as possible.
Failure to follow these instructions increases the
risk of an accident.
!When synchronizing the ESP
®, make
sure you can turn the steering wheel in
both directions as far as it will go with-
out the wheels hitting any objects, e.g.
a road curb.
Page 370 of 498

369 Practical hints
What to do if …
Display message
Possible cause/consequence
Possible solution
ESP
Display malfunction
Visit workshop
The ESP
® or the ESP
® display is mal-
functioning.
Continue driving with added caution.
Have the system checked at an authorized
Mercedes-Benz Center as soon as possible.
Failure to follow these instructions increases the
risk of an accident.
P
Gear selector lever
in Park
You have attempted to turn off the
engine with the KEYLESS-GO*
start/stop button with the gear
selector lever not inP. You have
opened the driver's door with the
gear selector lever not inP.
Place the gear selector lever in positionP.
P/N
Shift to
Neutral or Park
You have attempted to start the
engine with the KEYLESS-GO*
start/stop button while the gear se-
lector lever was in positionR orD.
Place the gear selector lever in positionP
orN. Make sure the brake pedal is depressed.
Low Battery
Conven. functions
temporarily
unavailable
The battery has insufficient voltage
and can no longer supply conve-
nience functions such as the rear
window defroster.
As soon as the on-board voltage is sufficient, the
consumers will switch on again.
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370 Practical hintsWhat to do if …Display messages
Possible cause/consequence
Possible solution
Please note:
Conven. functions
available again
On-board voltage is sufficient; the
consumers will switch on again.
Run Flat Indicator
inactive
Run Flat Indicator* is
malfunctioning.
Have the Run Flat Indicator* checked by an
authorized Mercedes-Benz Center.
Check tires
Then reactivate
Run Flat Indicator
There was a warning message about
a loss in the tire inflation pressure
and the Run Flat Indicator* has not
been reactivated yet.
Make sure that the correct tire inflation pres-
sure is set for each tire.
Then reactivate the Run Flat Indicator*.
Run Flat Indicator
unavailable
The Run Flat Indicator* has been
switched off due to an error.
Have the Run Flat Indicator* checked by an
authorized Mercedes-Benz Center.
Tire pressure
Check tires
The Run Flat Indicator* indicates
that the pressure is too low in one or
more tires.
Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers. Ob-
serve the traffic situation around you.
Check and adjust tire inflation pressure as
required (
page 313).
If necessary, change the wheel (
page 423).
Reactivate the Run Flat Indicator* after adjust-
ing the tire inflation pressure values
(page 315).
Page 372 of 498
371 Practical hints
What to do if …
Display messages
Possible cause/consequence
Possible solution
Tire pressure
displayed only
after driving a
few minutes
The tire inflation pressure is being
checked.
Drive the vehicle for a few minutes.
Tire pres. monitor
currently unavailable
The Advanced TPMS* is unable to
monitor the tire pressure due to
a nearby radio interference
source.
excessive wheel sensor temper-
atures.
As soon as the causes for the malfunction are
no longer present, the Advanced TPMS* auto-
matically becomes active again after a few
minutes driving.
Tire pres. monitor
inoperative
The Advanced TPMS* is
malfunctioning.
Have the Advanced TPMS* checked by an au-
thorized Mercedes-Benz Center.
Page 373 of 498
372 Practical hintsWhat to do if …Display messages
Possible cause/consequence
Possible solution
Tire pres. monitor
inoperative
No wheel sensors
There are wheels without wheel sen-
sors mounted (e.g. winter tires).
Have the Advanced TPMS* checked by an au-
thorized Mercedes-Benz Center.
Have the wheel sensors installed by an
authorized Mercedes-Benz Center.
Tire pres. monitor
Wheel sensor missing
One or more sensors malfunc-
tion (e.g. battery is empty).
One or more wheels without
wheel sensors mounted (e.g.
spare tire).
The tire inflation pressure for the re-
spective tire is not shown in the mul-
tifunction display.
Have the Advanced TPMS* checked by an au-
thorized Mercedes-Benz Center.
Have the wheel sensors installed by an
authorized Mercedes-Benz Center.
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373 Practical hints
What to do if …
Symbol messagesDisplay symbol
Display messages
Possible cause/consequence
Possible solution
#
Low voltage
Switch off
consumers
The battery has insufficient voltage.
Turn off unnecessary electrical con-
sumers.
Visit workshop
The battery is no longer charging.
Possible causes:
alternator malfunctioning
broken poly-V-belt
Do not forget that the brake system
requires electrical energy and may be
operating with restricted capability.
Considerably greater brake pedal force is
required and the stopping distance is
increased.
Stop immediately in a safe location or
as soon as it is safe to do so and
check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise
the engine will overheat due to an
inoperative water pump which may re-
sult in damage to the engine. Notify
an authorized Mercedes-Benz Center.
If it is intact:
Drive immediately to the nearest
authorized Mercedes-Benz Center.
Adjust driving to be consistent with
reduced braking responsiveness.
Page 375 of 498
374 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
#
Battery/Alternator
Stop vehicle
The battery is malfunctioning.
The electro-hydraulic brake system re-
quires electrical energy and therefore has
only limited operation. Considerably
greater brake pedal force is required and
the stopping distance is increased.
Stop the vehicle as soon as it is safe
to do so. Adjust driving to be consis-
tent with reduced braking responsive-
ness.
Notify an authorized Mercedes-Benz
Center.
Low voltage
Start engine
The battery has insufficient voltage.
Start the engine (
page 49).
2
Brake wear
Visit workshop
The brake pads have reached their wear
limit.
Have the brake pads replaced as soon
as possible.
!Brake pad thickness must be visually
inspected by a qualified technician at
the intervals specified in the
Maintenance Booklet.
Page 376 of 498
375 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
!
Release parking
brake
You are driving with the parking brake
set.
Release the parking brake
(page 51).
T
Reduced braking power
Depress brake
pedal fully
The electro-hydraulic brake system is in
emergency operation mode. Consider-
ably greater brake pedal force is required
and the stopping distance is increased.
The maximum speed is limited to 55 mph
(90 km/h).
Do not drive any further.
Stop the vehicle in a safe location and
notify an authorized Mercedes-Benz
Center.
Prevent the vehicle from rolling away
by blocking the wheels with wheel
chocks or other sizable objects.
Call for Roadside Assistance.
(USA only);(Canada only)3
Reduced braking power
Start engine
The battery has insufficient voltage and
cannot supply sufficient power to the
electro-hydraulic brake system.
Start the engine.
The message disappears when suffi-
cient voltage is available.