
Engine
Display messages Possible causes/consequences and
0050
0050Solutions Exhaust Filter:
Exhaust Filter:
Drive at high Drive at high
engine speed. See engine speed. See
Oper. Manual Oper. Manual The automatic regeneration of the diesel particle filter is not suf-
ficient or has malfunctioned.
X
Drive at an engine speed of above 2000 rpm until the display
message disappears.
If the display message does not go out after approximately
20 minutes, have the malfunction rectified immediately at a
qualified specialist workshop. Check Diesel Check Diesel
Exhaust Fluid See Exhaust Fluid See
Operator's Manual Operator's Manual The Diesel Exhaust Fluid (DEF) supply has dropped below
1.5 US gal (5.5 l).
After the message appears for the first time, and under normal
driving conditions, the remaining DEF supply will last for approx-
imately 1000 miles (1600 km).
After that, the 0.8 US gal (3.0 l) reserve mark is reached. A warning
tone sequence sounds and the engine can then only be started
another 16 times.
X Add DEF supply (Y page 149).
After topping up, the system check takes approximately
20 seconds. The display message then disappears. Check Diesel Check Diesel
Exhaust Fluid See Exhaust Fluid See
Operator's Manual Operator's Manual If the yellow
00B9Check Engine indicator lamp lights up as well,
the DEF reducing agent is contaminated, diluted or not compliant
with ISO 22241.
After the first message and under normal operating conditions,
you can drive on for up to approximately 50 miles (80 km). Then
a warning tone sequence sounds and the engine can only be
started another 16 times.
Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible. Display messages
213On-board computer and displays Z 

Display messages Possible causes/consequences and
0050
0050Solutions 00E2
XX XX
starts
starts remaining
remaining The Diesel Exhaust Fluid (DEF) supply has dropped below the
0.8 US gal (3.0 l) reserve mark.
After the message appears for the first time, the remaining DEF
supply will last for approximately 1000 miles (1600 km). The
engine can then only be started another 16 times.
The number of remaining engine starts
XX XX(1616 to0
0) is shown in the
message every time the engine is started. If the number displayed
is 0 0, the yellow 00B9Check Engine indicator lamp also lights up
and you can only drive the vehicle at a maximum 5 mph
(8 km/h).
X Add at least 2.0 US gal (7.6 l) of DEF (Y page 149).
The display message disappears no more than 20 seconds after
the vehicle has stopped or you have switched on the ignition or
started the engine after refueling. 00E2
Idle Mode Idle Mode In addition, the yellow
00B9Check Engine indicator lamp lights
up.
The vehicle cannot be driven at a speed exceeding 5 mph
(8 km/h). The DEF reducing agent is contaminated, diluted or is not compli-
ant with ISO 22241.
X
Have the DEF tank cleaned and refilled at a qualified specialist
workshop immediately. The exhaust gas aftertreatment is malfunctioning or an emission
relevant malfunction has occurred. This malfunction or defect can
damage the exhaust gas aftertreatment.
X
Visit a qualified specialist workshop immediately. 00AC
Coolant Coolant
Stop,
Stop,turn
turn
engine off
engine off The coolant temperature is too high.
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Consult a qualified specialist workshop. 00AC
Coolant Coolant
Stop,
Stop,turn
turn
engine off
engine off The coolant temperature is too high.
If the vehicle is stopped after being subjected to extreme loads,
the coolant warning lamp may come on when the ignition is
switched on or the engine is restarted. Such loads can be, for
example, driving in mountainous terrain or driving with a trailer.
X
Run the engine for approximately 1 minute at idling speed.
X Consult a qualified specialist workshop if the display message
continues to be shown. 214
Display
messagesOn-board computer and displays 

Display messages Possible causes/consequences and
0050
0050Solutions 00BC
Coolant Coolant
Check
Checklevel
level The coolant level is too low.
Never run the engine if the coolant level is too low. The engine
could overheat and be damaged.
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Switch off the engine and let it cool down.
X Add coolant and be sure to observe the warning notes
(Y page 329).
X If you need to add coolant frequently, have the engine cooling
system checked at a qualified specialist workshop. 00B5
Reserve Reserve
fuel
fuelDrive
Drive
to a filling stat.
to a filling stat. The fuel level has fallen into the reserve range.
X
Refuel at the nearest gas station ( Ypage 148). 00B8
Water in fuel Water in fuel
Visit workshop Visit workshop The water that has collected in the water separator has reached
the maximum level.
X
Drain the water separator (Y page 257).00B2
Engine Engine
oil
oilAdd
Add 1.0
1.0
quart(Canada: 1.0
quart(Canada: 1.0
liter) liter) The oil level is too low.
X
Check the oil level the next time you refuel (Y page 252), and
add oil. 00B2
Engine oil level Engine oil level
Not when eng. run‐ Not when eng. run‐
ning ning You want to check the oil level even though the engine is running.
X
Switch off the engine.
X Check the oil level (Y page 252).00B2
Engine oil level Engine oil level
Reduce oil level Reduce oil level You have added too much engine oil. There is a risk of damaging
the engine or catalytic converter.
X
Check the oil level.
X If the oil level is too high: have the engine oil extracted at the
next qualified specialist workshop.
X If the oil level is correct: have the malfunction rectified at the
next qualified specialist workshop. Display
messages
215On-board computer and displays Z 

Display messages Possible causes/consequences and
0050
0050Solutions Check tire(s)
Check tire(s)
0054 The pressure of one or more tires has dropped significantly. If the
tire pressure monitor has detected the affected wheel, the wheel
position is also displayed.
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Check the tires.
X Repair or change the wheel if necessary (Y page 307).
X Check the tire pressure and correct it if necessary
(Y page 293).
The display message disappears automatically after driving for
a few minutes with the corrected tire pressure. Warning Warning
Tire
Tiredefect
defect
0054 One or more tires is losing air rapidly. If the tire pressure monitor
has detected the affected wheel, the wheel position is also dis-
played.
X
Stop the vehicle without making any sudden steering or braking
maneuvers, paying attention to the traffic conditions as you do
so.
X Repair or change the wheel (Y page 307).Vehicle
Display messages Possible causes/consequences and
0050 0050Solutions 003D
Battery/Alterna‐ Battery/Alterna‐
tor Visit workshop tor Visit workshop The battery is not being charged. Possible causes are a defective
alternator or a torn poly-V-belt.
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Check the poly-V-belt.
X If the poly-V-belt is torn: do not continue driving. Consult a
qualified specialist workshop.
X If the poly-V-belt is not damaged: have the vehicle checked as
soon as possible by a qualified specialist workshop. 00E6
Electrical Step Electrical Step The electrical step has retracted or extended only partially or not
at all.
X
Make sure there is sufficient free space for the electrical step.
X Open or close the sliding door again.
X If the electrical step still does not extend or retract fully, push
the step in manually (Y page 74). Before stepping out, remind
the passengers that the step is missing. Display
messages
219On-board computer and displays Z 

Indicator and warning lamps in the instrument cluster
Problem Possible causes/consequences and
0050
0050Solutions 0072
The yellow ASR/
ESP®
warning
lamp flashes
while the vehicle
is in motion. G
WARNING
ESP ®
or ASR is intervening because at least one of the wheels has
reached its tire grip limit.
Cruise control is deactivated for the duration of the intervention.
X Adapt your driving style to suit the road and traffic conditions.
Do not use too much throttle.
X Drive slowly. 0072
The yellow ASR/
ESP®
warning
lamp is lit while
the engine is
running. ASR is deactivated.
G WARNING
The driven wheels can spin when accelerating.
There is an increased risk of skidding and accidents.
X Activate ASR again. Exceptions (Y page 60).0089
0025003D0065
The yellow ESP ®
, ABS
and ASR/BAS indicator
lamps and the red
brake system indicator
lamp are lit while the
engine is running. EBD is malfunctioning or deactivated due to undervoltage or mal-
function.
The battery may not be being charged.
G WARNING
The rear wheels could lock sooner than expected when you apply
the brakes. The braking distance can increase in emergency brak-
ing situations.
There is an increased risk of skidding and accidents.
X Vehicles with steering wheel buttons: also observe the mes-
sages in the display (Y page 199).
X Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Do not drive on.
X Consult a qualified specialist workshop. Indicator and warning lamps in the instrument cluster
221On-board computer and displays Z 

Problem Possible causes/consequences and
0050
0050Solutions 0065
The red brake
system indicator
lamp is lit while
the engine is
running. There is insufficient brake fluid in the expansion tank.
G WARNING
Braking performance can be impaired.
There is a risk of an accident.
X Vehicles with steering wheel buttons: also observe the mes-
sages in the display (Y page 199).
X Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Check the brake fluid level in the expansion tank
(Y page 256).
X If the brake fluid is below the MIN mark: do not drive on!
X Do not add brake fluid. This does not solve the problem.
X Consult a qualified specialist workshop. 0065
When towing a
trailer: the red
brake system
indicator lamp is
lit while the
engine is run-
ning.
Additionally, a
warning tone
sounds. G
WARNING
The brake force booster in the trailer is faulty.
The driving and braking characteristics of your vehicle could
change. There is a risk of the trailer overbraking and of you losing
control over the truck/trailer combination.
There is a risk of an accident.
X Vehicles with steering wheel buttons: also observe the mes-
sages in the display (Y page 199).
X Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Do not drive on.
X Consult a qualified specialist workshop. 003D
The yellow ASR/
BAS indicator
lamp is lit while
the engine is
running. ASR has been deactivated due to a malfunction.
The engine power output may be reduced.
G WARNING
The driven wheels can spin when accelerating.
There is an increased risk of skidding and accidents.
X Drive on with care.
X Consult a qualified specialist workshop as soon as possible. 222
Indicator and warning lamps in the instrument clusterOn-board computer and displays 

Problem Possible causes/consequences and
0050
0050Solutions 003D
The yellow ASR/
BAS indicator
lamp is lit while
the engine is
running. BAS has been deactivated due to a malfunction.
G WARNING
The brake system continues to function normally, but without
electronic support.
The braking distance can increase in emergency braking situa-
tions.
There is a risk of an accident.
X Drive on with care.
X Visit a qualified specialist workshop immediately. 003D
The yellow ASR/
BAS indicator
lamp is lit while
the engine is
running. ASR and BAS have been deactivated due to undervoltage.
The battery may not be being charged.
G WARNING
The brake system is still available with the normal braking effect.
The driven wheels can spin when accelerating.
The braking distance can increase in emergency braking situa-
tions.
There is an increased risk of skidding and accidents.
X Drive on with care.
X Visit a qualified specialist workshop immediately. Indicator and warning lamps in the instrument cluster
223On-board computer and displays Z 

Problem Possible causes/consequences and
0050
0050Solutions 0025
The yellow ABS
indicator lamp is
lit while the
engine is run-
ning. ABS is deactivated due to a malfunction or is temporarily unavail-
able. ESP
®
, ASR and BAS, as well as cruise control, are also
unavailable as a result.
Self-diagnosis may not be complete, or the battery may not be
charging.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock, e.g. if the
brakes are applied with maximum force.
This causes steerability and braking to be greatly impaired.
The braking distance can increase in emergency braking situa-
tions.
The driven wheels can spin when accelerating.
If ESP ®
is not operational, ESP ®
will not stabilize the vehicle.
There is an increased risk of skidding and accidents.
X Drive a short distance at a speed above 13 mph (20 km/h).
The functions mentioned above are available again when the
indicator lamp goes out.
If the indicator lamp does not go out:
X Drive on with care.
X Visit a qualified specialist workshop immediately. 00E2
The yellow DEF
indicator lamp is
lit while the
engine is run-
ning. The exhaust gas aftertreatment is malfunctioning or the current
Diesel Exhaust Fluid (DEF) supply is limiting the vehicle range.
X
Observe the messages in the display. 0089
The yellow ESP ®
indicator lamp is
lit while the
engine is run-
ning. ESP
®
is deactivated due to undervoltage or a malfunction. As a
result, cruise control has also been deactivated.
Engine power output may be reduced.
The battery may not be being charged.
G WARNING
If ESP ®
is not operational, ESP ®
will not stabilize the vehicle.
There is an increased risk of skidding and accidents.
X Vehicles with steering wheel buttons: also observe the mes-
sages in the display (Y page 199).
X Drive on with care.
X Visit a qualified specialist workshop immediately. 224
Indicator and warning lamps in the instrument clusterOn-board computer and displays