Problem Possible causes/consequences and
0050 Solutions0077
US vehicles
only:
The yellow tire
pressure
monitor warning
lamp flashes for
60 seconds and
then remains lit. The tire pressure monitor has malfunctioned.
X
Have the tire pressure monitor and the wheels checked at a
qualified specialist workshop. 00BA
The yellow water
separator
indicator lamp
lights up when
the ignition is
started. The water that has collected in the water separator has reached
the maximum level.
X
Drain the water separator ( Y page 221).00BD
The yellow
washer fluid
level indicator
lamp for the
windshield
washer/
headlamp
cleaning system
lights up after
the engine is
started or while
the vehicle is in
motion. The water level is too low.
X
Top up washer fluid ( Y page 171).0082
The red seat belt
warning lamp
lights up for
approximately
six seconds
when the key is
turned to
position 2 in the
ignition lock.
A warning tone
also sounds. The warning lamp is to remind you to fasten your seat belt.
X
Fasten seat belt (Y page 34).196
TroubleshootingPractical advice
Display messages
Display messages on vehicles without steering wheel buttons Display messages Possible causes/consequences and
0050 SolutionsNO TPMS The NO message is displayed for 30 seconds. The
TPMS message
is also displayed after 30 seconds.
The tire pressure monitor has malfunctioned.
X Have the tire pressure monitor and the wheels checked at a
qualified specialist workshop. NO TPMS The NO message is displayed for 30 seconds. The
TPMS message
is also displayed after 30 seconds.
The tire pressure
monitor is not receiving signals from one or more
wheels because:
R a wheel has been replaced with the spare wheel without wheel
electronics.
R the maximum temperature on one of the wheel electronics units
has been exceeded.
R the wheel electronics are malfunctioning.
X Have wheels with suitable wheel electronics units installed at a
qualified specialist workshop. — — TPMS The ——
message is displayed for 30 seconds. The
TPMS message
is also displayed after 30 seconds.
The pressure in
one or more tires is too low or there is a significant
difference between tire pressures on individual wheels.
X Check the tire pressure at the next opportunity and correct it if
necessary ( Y page 281). 009B
dEF Chk In addition, the yellow
00BB engine diagnosis indicator lamp and
the yellow 00E4
DEF indicator lamp light up and a warning tone
sounds.
The DEF reducing agent is contaminated, diluted or is not
compliant with ISO 22241 .
After the message appears for the first time, and under normal
driving conditions, you can continue driving for approximately
50 miles
(80 km). After this, a warning tone sequence sounds. The
engine can then only be started another sixteen times.
X Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible. Troubleshooting
199
Practical advice Z
Display messages Possible causes/consequences and
0050 Solutions009B
dEF Chk In addition, the yellow
00E4 DEF indicator lamp lights up and a
warning tone sounds.
The 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
approximately 1000 miles (1600 km)
.
After that, the 0.8 US gal (3.0 l) reserve mark is reached. A warning
tone sequence sounds. The engine can then only be started
another sixteen times.
X add DEF supply ( Y page 143).
After topping up, the system check takes approximately
20 seconds. The 00E4 DEF indicator lamp then goes out.009B
StArtS RE xx In addition, the yellow
00BB engine diagnosis indicator lamp and
the yellow 00E4 DEF indicator lamp light up and a warning tone
sounds. A warning tone sequence sounds.
After the message appears for the first time, the engine can only
be started another sixteen times.
The number
of
remaining engine starts xx (16 to 0) is shown in the
message every time the engine is started. Once the number 0 is
shown, the engine can no longer be started. The DEF reducing agent is contaminated, diluted or is not
compliant with ISO 22241.
X
Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible.200
Troubleshooting
Practical advice
Display messages Possible causes/consequences and
0050 SolutionsThe exhaust gas aftertreatment system is defective or an
emissions-relevant malfunction has occurred. The defect or
malfunction can result in damage to the exhaust gas
aftertreatment system.
X
Visit a qualified specialist workshop immediately. 009B
StArtS RE xx In addition, the yellow
00E4 DEF indicator lamp lights up and a
warning tone sequence sounds.
The 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 1200 miles (1900 km). The
engine can then only be started another sixteen times.
The
number of remaining engine starts xx (16 to 0) is shown in the
message every time the engine is started. Once the number 0 is
shown, the yellow 00BB engine diagnosis indicator lamp lights up
and the engine can no longer be started.
X Add at least 2.0 US gal (7.6 l) of DEF (Y page 143).
After topping up, the system check takes approximately
20 seconds. The 00E4 DEF indicator lamp then goes out.Text messages on vehicles with steering wheel buttons
Display messages Possible causes/consequences and
0050 SolutionsABS
Visit workshop
G
Warning!
ABS has been deactivated due to a malfunction. ESP ®
, ASR and
BAS, as well as cruise control, have also been deactivated as a
result.
The brake system is still available with complete brake boosting
effect but without ABS.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. ABS
Unavailable
G
Warning!
ABS is temporarily unavailable. Self diagnosis may not have been
completed yet.
The brake system
is still available with the normal braking effect.
X Drive a short distance at a speed above 13 mph (20 km/h).
ABS is available again if the display message goes out. Troubleshooting
201
Practical advice Z
Display messages Possible causes/consequences and
0050 SolutionsABS
Unavailable
G
Warning!
ABS has been deactivated due to undervoltage. The battery might
not be charging.
The brake system
is still available with the normal braking effect.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. Check Diesel
Exhaust Fluid see
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
approximately 1000 miles (1600 km).
After
that, the 0.8 US gal (3.0 l) reserve mark is reached. A warning
tone sequence sounds. The engine can then only be started
another sixteen times.
X add DEF supply ( Y page 143).
After topping up, the system check takes approximately
20 seconds. The display message then disappears. Check Diesel
Exhaust Fluid see
Operator's Manual If the yellow
00BB engine diagnosis indicator lamp lights up in
addition, the DEF reducing agent is contaminated, diluted or not
compliant with ISO 22241.
After the message appears for the first time, and under normal
driving conditions, you can continue driving for approximately
50 miles
(80 km). After this, a warning tone sequence sounds. The
engine can then only be started another sixteen times.
Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible. ESP
Visit workshop
G
Warning!
ESP ®
has been deactivated due to a malfunction. This also
deactivates cruise control.
The vehicle's stability is no longer automatically regulated at an
early stage. Engine power output may be reduced.
X Drive on carefully.
X Visit a qualified specialist workshop immediately.202
Troubleshooting
Practical advice
Display messages Possible causes/consequences and
0050 SolutionsESP
Unavailable
ESP
®
has been deactivated due to undervoltage. This also
deactivates cruise control.
The battery might not be charging.
The vehicle's stability is no longer automatically regulated at an
early stage. Engine power output may be reduced.
X Drive on carefully.
X Visit a qualified specialist workshop as soon as possible. Tire pres.
Adj. pres. The pressure in one or more tires is too low or there is a significant
difference between tire pressures on individual wheels.
X
Check the tire pressure at the next opportunity and correct it if
necessary ( Y page 281). Tire pres.
monitor
inoperative The tire pressure monitor has malfunctioned.
X
Have the tire pressure monitor and the wheels checked at a
qualified specialist workshop. Tire press.
monitor currently
unavail. The tire pressure monitor function is temporarily unavailable due
to radio interference or undervoltage.
X
As soon as the causes have been remedied, the tire pressure
monitor activates itself automatically. Tire press.
monitor
inoperative No
wheel sensors The tire pressure monitor is not receiving signals from one or more
wheels because:
R
a wheel has
been replaced with the spare wheel without wheel
electronics.
R the maximum temperature on one of the wheel electronics units
has been exceeded.
R the wheel electronics are malfunctioning.
X Have wheels with suitable wheel electronics units installed at a
qualified specialist workshop. Cruise control
Visit workshop Cruise control has been deactivated due to a malfunction.
X
Have cruise control checked at a qualified specialist workshop. SRS
Restraint system
Visit workshop
G
Warning!
The restraint systems have malfunctioned. The air bags or belt
tensioners could be triggered unintentionally or might not be
triggered at all in the event of an accident.
X Drive on carefully.
X Visit a qualified specialist workshop as soon as possible. Troubleshooting
203
Practical advice Z
Symbol messages on vehicles with steering wheel buttons
Display messages Possible causes/consequences and
0050 Solutions00E4
xx
starts 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 1200 miles (1900 km). The
engine can then only be started another twenty times.
The
number
of remaining engine starts xx (20 to 0) is shown in the
message every time the engine is started. Once the number 0 is
shown, the yellow 00BB engine diagnosis indicator lamp lights up
and the engine can no longer be started.
X Add at least 2.0 US gal (7.6 l) of DEF (Y page 143).
After topping up, the system check takes approximately
20 seconds. The display message then disappears. 00E4
xx
starts remaining In addition, the yellow
00BB engine diagnosis
indicator lamp lights
up.
After the message appears for the first time, the engine can only
be started another twenty times.
The number of remaining engine starts xx (20 to 0) is shown in the
message every time the engine is started. Once the number 0 is
shown, the engine can no longer be started. The DEF reducing agent is contaminated, diluted or is not
compliant with ISO 22241.
X
Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible. The exhaust gas aftertreatment system is defective or an
emissions-relevant malfunction has occurred. The defect or
malfunction can result in damage to the exhaust gas
aftertreatment system.
X
Visit a qualified specialist workshop immediately. 003D
Visit workshop G
Warning!
ASR has been deactivated due to a malfunction.
The engine power output may then be lower.
X Drive on carefully.
X Visit a qualified specialist workshop immediately.204
Troubleshooting
Practical advice
Display messages Possible causes/consequences and
0050 Solutions0065
Brake force
distribution G
Warning!
EBD has been deactivated due to undervoltage.
The battery might not be charging.
The rear wheels
could lock sooner than expected when you apply
the brakes.
X Pull over immediately, paying attention to road and traffic
conditions.
X Do not continue driving.
X Visit a qualified specialist workshop. 0065
Brake force
distribution Visit
workshop G
Warning!
EBD has malfunctioned.
The rear wheels
could lock sooner than expected when you apply
the brakes.
X Pull over immediately, paying attention to road and traffic
conditions.
X Do not continue driving.
X Consult a qualified specialist workshop. 0066
Parking brake
Release brake A warning tone also sounds.
You are driving with the parking brake applied.
X
Release the parking brake ( Y page 112).0082
Seatbelt sys.
Visit workshop G
Warning!
The belt system has malfunctioned.
X Visit a qualified specialist workshop as soon as possible. 00AE
Coolant Stop,
turn
engine off The coolant temperature is too high.
X
Pull over immediately, paying attention to road and traffic
conditions.
X Consult a qualified specialist workshop. 00AE
Coolant Stop,
turn
engine off The coolant temperature is too high.
If the vehicle is stopped after being subjected to extreme loads
(e.g. driving in mountainous terrain, trailer towing, etc.), this
display message may be shown when the ignition is switched on
or the engine is restarted.
X
Run the engine for approximately one minute at idling speed.
X Consult a qualified specialist workshop if the display message
continues to be shown.206
Troubleshooting
Practical advice