2016 MERCEDES-BENZ GLS SUV engine

Display messages
Possible causes/consequences and
M
MSolutions G
Inoperative
Inoperative One or more main features of the Mercedes-Benz Contact system are
malfunctioning.
X Consult a qualified specialist workshop. Active
Active
Brake
BrakeAssist
Assist
Functions
Functions currently
currently
limited
limited See
SeeOwner's
Owner's
Manual
Manual Active Brake Assist with cross-traffic function is temporarily inopera-
tive.
Possible causes:
R The radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio stations or
other sources of electromagnetic radiation.
R The system is outside the operating temperature range.
R The on-board voltage is too low.
Once the causes listed above no longer apply, the display message
goes out.
Active Brake Assist with cross-traffic function or PRE ‑SAFE®
PLUS is
functional again.
If the display message does not disappear:
X Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 168).
X Restart the engine. Active Active
Brake
BrakeAssist
Assist
Functions limited
Functions limited
See Owner's Manual See Owner's Manual Active Brake Assist is unavailable due to a malfunction. Adaptive
Brake Assist may also have failed.
X Consult a qualified specialist workshop immediately. PRE-SAFE inopera‐
PRE-SAFE inopera‐
tive see Owner's tive see Owner's
Manual Manual
Important functions of PRE-SAFE
®
have failed. All other occupant
safety systems, e.g. airbags, remain available.
X Consult a qualified specialist workshop immediately. 264
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions Active
Active
Brake
BrakeAssist
Assist
Functions
Functions currently
currently
limited
limited See
SeeOwner's
Owner's
Manual
Manual Active Brake Assist or PRE‑SAFE
®
PLUS is temporarily inoperative.
Possible causes:
R The function is impaired due to heavy rain or snow.
R The radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio stations or
other sources of electromagnetic radiation.
R Mercedes-AMG vehicles: ESP ®
is deactivated.
R The system is outside the operating temperature range.
R The on-board voltage is too low.
Once the causes listed above no longer apply, the display message
goes out.
Active Brake Assist or PRE‑SAFE ®
PLUS is operative again.
If the display message does not disappear:
X Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 168).
X Restart the engine.
X Mercedes-AMG vehicles: reactivate ESP ®
(Y page 73). Active Active
Brake
BrakeAssist
Assist
Functions limited
Functions limited
See Owner's Manual See Owner's Manual Active Brake Assist with cross-traffic function or PRE
‑SAFE®
PLUS is
not available due to a fault.
X Consult a qualified specialist workshop immediately. Display
messages
265On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions Radar
Radar
sensors
sensors dirty
dirty
See Owner's Manual
See Owner's Manual The radar sensor system is malfunctioning.
Possible causes:
R Dirt on sensors
R Heavy rain or snow
R Driving on inter-urban roads without traffic or infrastructure, e.g. in
desert-like areas
At least one driving system or driving safety system is malfunctioning
or is temporarily unavailable:
R PRE-SAFE ®
PLUS
R Active Brake Assist
R Active Lane Keeping Assist
R Active Blind Spot Assist
R Distance Pilot DISTRONIC
If the radar sensor system in front is dirty, Active Blind Spot Assist will not perform a course-correcting brake application.
A warning tone also sounds.
Once the cause of the problem is no longer present, the driving and
driving safety systems will be available again. The display message
disappears.
If the display message does not disappear:
X Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 168).
X Switch off the engine.
X Clean all sensors (Y page 341).
X Restart the engine.
The display message disappears. ü Mercedes-AMG vehicles only:
If this symbol appears in the multifunction display, a seat belt tongue
has been inserted into a rear seat belt buckle.
Further information on the status indicator for the rear seat belts
(Y page 47). ý Mercedes-AMG vehicles only:
If this symbol appears in the multifunction display, a seat belt tongue
has not been inserted in a rear seat belt buckle.
G WARNING
A seat belt which is not worn correctly, or which has not been engaged
in the seat belt buckle correctly, cannot provide the intended level of protection.
This poses an increased risk of injury.
X If necessary, ask the occupants in the rear to fasten their seat belts
(Y page 46).
Further information on the status indicator for the rear seat belts
(Y page 47). 266
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions b
Switch on headlamps Switch on headlamps You are driving without dipped-beam headlamps.
X
Turn the light switch to the Lorà position. Adaptive Highbeam Adaptive Highbeam
Assist Plus cur‐ Assist Plus cur‐
rently unavailable rently unavailable
See Owner's Manual See Owner's Manual Adaptive Highbeam Assist Plus is deactivated and temporarily inop-
erative.
Possible causes:
R The windscreen is dirty in the camera's field of vision.
R Visibility is impaired due to heavy rain, snow or fog.
X Clean the windscreen.
If the system detects that the camera is fully operational again, the Adaptive Highbeam Assist Plus available again Adaptive Highbeam Assist Plus available again message is
displayed.
Adaptive Highbeam Assist Plus is operational again. Adaptive Highbeam Adaptive Highbeam
Assist Plus inoper‐ Assist Plus inoper‐
ative ative Adaptive Highbeam Assist Plus is faulty.
X Consult a qualified specialist workshop. Engine
Display messages
Possible causes/consequences and
M
MSolutions +
Top up coolant See Top up coolant See
Owner's Manual Owner's Manual The coolant level is too low.
! Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
X Top up the coolant, observing the warning notes before doing so
(Y page 335).
If you have to top up the coolant frequently: X Contact a qualified specialist workshop and have the engine cooling
system checked. ? The fan motor is faulty.
X If the coolant temperature is below 120 †, continue driving to the
nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in moun-
tainous terrain and stop-start traffic. Display
messages
271On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions ?
Coolant Stop vehi‐ Coolant Stop vehi‐
cle Switch engine cle Switch engine
off off The coolant is too hot.
A warning tone also sounds.
G WARNING
Never drive with an overheated engine. Driving when your engine is
overheated can cause any fluids that may have leaked into the engine
compartment to catch fire.
In addition, steam from an overheated engine can cause serious
burns, which can occur just by opening the bonnet.
There is a risk of injury.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Safeguard the vehicle against rolling away (Y page 168).
X Wait until the engine has cooled down.
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 display message goes out and
the coolant temperature is below 120 †. The engine may otherwisebe damaged.
X Pay attention to the coolant temperature gauge.
If the temperature increases again:
X Consult a qualified specialist workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 120 †. #
See Owner's Manual See Owner's Manual The battery is no longer being charged.
A warning tone also sounds.
Possible causes:
R faulty alternator
R torn poly-V-belt
R a malfunction in the electronics
! Do not continue driving. The engine could otherwise overheat.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Safeguard the vehicle against rolling away (Y page 168).
X Consult a qualified specialist workshop. 272
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions #
Stop vehicle See Stop vehicle See
Owner's Manual Owner's Manual The battery is no longer being charged and the battery charge level is
too low.
A warning tone also sounds.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Safeguard the vehicle against rolling away (Y page 168).
X Observe the instructions in the #See SeeOwner's
Owner's Manual
Manualdisplay
message.
X Consult a qualified specialist workshop. 4
Check Check
eng.
eng.oil
oillev.
lev.
when
when next
nextrefuelling
refuelling The engine oil level has dropped to the minimum level.
A warning tone also sounds.
! Avoid long journeys when there is too little coolant in the cooling
system. Otherwise the engine will be damaged.
X Check the oil level when next refuelling, at the latest (Y page 334).
X If necessary, top up the engine oil (Y page 334).
If you have to top up the engine oil frequently:
X Contact a qualified specialist workshop and have the engine
checked.
Information on approved engine oils can be obtained from any quali-
fied specialist workshop or on the Internet at http://bevo.mercedes-
benz.co m. 4
Add 1 litre engine Add 1 litre engine
oil when next refu‐ oil when next refu‐
elling elling Mercedes-AMG vehicles: the engine oil level is too low.
! Avoid long journeys when there is too little coolant in the cooling
system. Otherwise the engine will be damaged.
X Check the oil level when next refuelling, at the latest (Y page 334).
X If necessary, top up the engine oil (Y page 334).
If you have to top up the engine oil frequently:
X Contact a qualified specialist workshop and have the engine
checked.
Information on approved engine oils can be obtained from any quali-
fied specialist workshop or on the Internet at http://bevo.mercedes-
benz.com. 4
Engine oil level Engine oil level
Stop Stop
vehicle
vehicle Switch
Switch
engine off
engine off Mercedes-AMG vehicles: the engine oil level is too low.
There is a risk of engine damage.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Safeguard the vehicle against rolling away (Y page 168).
X Check the engine oil level (Y page 334).
X If necessary, top up the engine oil (Y page 334). Display messages
273On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions 8
Reserve fuel level Reserve fuel level The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel level drops
into the reserve range.
X Refuel at the nearest filling station. C There is very little fuel in the fuel tank.
Operation of the auxiliary heating is deactivated.
X You must refuel at the nearest filling station. ¸
Replace Replace
air
air cleaner
cleaner
element
element Vehicles with a diesel engine: the engine air filter is dirty and must be
replaced.
X Consult a qualified specialist workshop. !
Clean the fuel fil‐ Clean the fuel fil‐
ter ter Vehicles with a diesel engine: there is water in the fuel filter. The water
must be drained off.
X Consult a qualified specialist workshop. Ø
Refill AdBlue See Refill AdBlue See
Owner's Manual Owner's Manual The AdBlue
®
level has fallen below the reserve range. A warning tone
also sounds.
X Have AdBlue ®
refilled as soon as possible at a qualified specialist
workshop.
or X Add at least 3.8 l of AdBlue ®
immediately (Y page 166). Ø
Refill AdBlue No Refill AdBlue No
start in .. km start in .. km The AdBlue
®
level is only sufficient for the indicated distance. A warn-
ing tone also sounds.
X Have AdBlue ®
refilled as soon as possible at a qualified specialist
workshop.
or
X Add at least 3.8 l of AdBlue ®
immediately (Y page 166). Ø
Refill AdBlue Eng. Refill AdBlue Eng.
start not possible start not possible The AdBlue
®
tank is empty. A warning tone also sounds. You can no
longer start the engine.
X Consult a qualified specialist workshop immediately.
or X Add at least 3.8 l of AdBlue ®
immediately (Y page 166). Ø
Check AdBlue See Check AdBlue See
Owner's Manual Owner's Manual The AdBlue
®
system is malfunctioning. A warning tone also sounds.
X Consult a qualified specialist workshop. 274
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions Ø
Eng. start not pos‐ Eng. start not pos‐
sible in ..km sible in ..km The AdBlue
®
system is malfunctioning. A warning tone also sounds.
X Consult a qualified specialist workshop immediately. Ø
Eng. start not pos‐ Eng. start not pos‐
sible sible The AdBlue
®
system is malfunctioning. A warning tone also sounds.
You can no longer start the engine.
X Consult a qualified specialist workshop immediately. Driving systems
Display messages
Possible causes/consequences and
M
MSolutions À
Attention Assist: Attention Assist:
Take a break! Take a break! Based on certain criteria, ATTENTION ASSIST has detected fatigue or
increasing lapses in concentration on the part of the driver. A warning tone also sounds.
X If necessary, take a break.
During long journeys, take regular breaks in good time so that you get enough rest. À
Attention Assist Attention Assist
inoperative inoperative ATTENTION ASSIST is inoperative.
X Consult a qualified specialist workshop. Á
Please reduce speed Please reduce speed You cannot change the vehicle level.
Possible causes:
R You are driving too fast for the selected vehicle level.
R You are driving too fast with a trailer or the trailer tow hitch socket
is being used, e.g. for a rear-mounted cycle rack.
X Drive more slowly and then select the desired vehicle level again:
R Vehicles with the Off-Road Engineering package (Y page 192)
R Vehicles with the AIRMATIC package (Y page 198)
X Observe the notes on towing a trailer (Y page 234).Á
Compressor is cool‐ Compressor is cool‐
ing ing You have selected a higher vehicle level. The compressor first needs
to cool down because of frequent level changes.
X Drive in a manner appropriate for the current vehicle level.
X Ensure sufficient ground clearance.
X Allow the compressor to cool down.
When the compressor has cooled down, the display message dis-
appears. The vehicle then continues rising to the selected level. Display
messages
275On-board computer and displays Z