2017 MERCEDES-BENZ GLC ECU

Tires Display messages
Possible causes/consequences and P Solutions
Check Tire Pressure
Soon Canada only:
The tire pressure loss warning system has detected a significant loss
in pressure.
A warning tone also sounds.
Possible causes: R
you have changed the positions of the wheels and tires or installed
new wheels and tires R
the tire pressure in one or more tires has dropped significantly
G WARNING
Tire pressures that are too low pose the following hazards: R
they may burst, especially as the load and vehicle speed increase. R
they may wear excessively and/or unevenly, which may greatly
impair tire traction. R
the driving characteristics, as well as steering and braking, may be
greatly impaired.
There is a risk of an accident. X
Stop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so. X
Secure the vehicle against rolling away ( Y
page 154).X
Check the tires and, if necessary, follow the instructions for a flat
tire ( Y
page 321). X
Check the tire pressures and, if necessary, correct the tire pressure. X
Restart the tire pressure loss warning system when the tire pres-
sure is correct ( Y
page 343).
Check Tire Pressure
Then Restart Run
Flat Indicator Canada only:
The tire pressure loss warning system generated a display message
and has not been restarted since. X
Set the correct tire pressure in all four tires. X
Restart the tire pressure loss warning system ( Y
page 343).
Run Flat Indicator
Inoperative Canada only:
The tire pressure loss warning system is faulty. X
Visit a qualified specialist workshop.
Please Correct Tire
Pressure The tire pressure is too low in at least one of the tires, or the tire
pressure difference between the wheels is too great. X
Check the tire pressures at the next opportunity ( Y
page 345).X
If necessary, correct the tire pressure. X
Restart the tire pressure monitor ( Y
page 345).250
Displa y messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
Check Tires The tire pressur e in on e or mor e tires has dropped significantly. The
whee l position is displayed in th e multifunction display.
A warning tone also sounds.
G WARNIN G
Tir e pressures that are to o low pos e th e followin g hazards :R
they may burst, especially as th e load and vehicl e speed increase.R
they may wear excessivel y and/o r unevenly, whic h may greatl y
impair tire traction .R
th e drivin g characteristics , as well as steering and braking , may be
greatl y impaired.
There is a ris k of an accident.X
Stop th e vehicl e without making any sudden steering or braking
maneuvers . Pay attention to th e traffic condition s as you do so.X
Secur e th e vehicl e against rollin g away ( Y
page 154).X
Chec k th e tires and , if necessary, follow th e instruction s for a flat
tire ( Y
page 321). X
Chec k th e tire pressur e ( Y
page 345).X
If necessary, correc t th e tire pressure.
Warnin g Tir e Mal ‐
function The tire pressur e in on e or mor e tires has dropped suddenly. The whee l
position is shown in th e multifunction display.
G WARNIN G
Drivin g wit h a flat tire poses a ris k of th e followin g hazards :R
a flat tire affects th e abilit y to steer or brak e th e vehicl eR
you could lose control of th e vehicl eR
continued drivin g wit h a flat tire will caus e excessive heat build-up
and possibl y a fir e
There is a ris k of an accident.X
Stop th e vehicl e without making any sudden steering or braking
maneuvers . Pay attention to th e traffic condition s as you do so.X
Secur e th e vehicl e against rollin g away ( Y
page 154).X
Chec k th e tires and , if necessary, follow th e instruction s for a flat
tire ( Y
page 321).
Tir e Press. Monito r
Currently Unavaila‐
ble Becaus e there is interferenc e from a stron g source of radi o waves, no
signals from th e tire pressur e sensor s are detected. The tire pressur e
monitor is temporarily malfunctioning .X
Drive on .
The tire pressur e monitor restarts automatically as soo n as th e
problem has been resolved.
TirePress . Sen ‐
sor(s) Missin g There is no signal from th e tire pressur e sensor of on e or several tires .
The pressur e of th e affecte d tire is no t displayed in th e multifunction
display. X
Hav e th e fault y tire pressur e sensor replace d at a qualified special -
ist workshop . Display messages 25 1
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
Tir e Pressure Moni‐
tor Inoperative No
Wheel Sensor s The wheels mounte d do no t hav e a suitable tire pressur e sensor . The
tire pressur e monitor is deactivated.X
Moun t wheels wit h suitable tire pressur e sensors.
The tire pressur e monitor is activated automatically after drivin g for
a few minutes.
Tir e Press. Monito r
Inoperative The tire pressur e monitor is faulty.X
Visit a qualified specialist workshop .
Vehicle Display messages
Possible causes/consequences and P Solutions
Shift to 'P' or 'N'
to Start Engine You hav e attempte d to start th e engin e wit h th e transmission in posi-
tion ^ or [ .X
Shift th e transmission to position ] or \\ .
Apply Brake to
Shift fro m 'P' You hav e attempte d to shift th e transmission to position [ , ^ or \\
without depressing th e brak e pedal .X
Depress th e brak e pedal .
To Deselect P or N,
Depres s Brake and
Start Engine Wit h th e engin e switched off , you hav e attempte d to shift th e trans -
mission out of position ] or \\ int o another transmission position .X
Depress th e brak e pedal .X
Start th e engine.
Transmission Not in
P Ris k of Vehicl e
Rollin g Awa y The driver's door is open or no t full y closed and th e transmission is in
position ^ , \\ or [ .
A warning tone also sounds.
G WARNIN G
The vehicl e may rol l away.
There is a ris k of an accident.X
Shift th e transmission to position ] .X
Secur e th e vehicl e against rollin g away ( Y
page 154).X
Clos e th e driver's door completely.
Onl y Shift to 'P'
whe n Vehicl e is Sta ‐
tionar y The vehicl e is moving .X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Shift th e transmission to position ] .252
Display messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
Servic e Required Do
Not Shift Gears
Visit Dealer You canno t chang e th e transmission position due to a malfunction .
A warning tone also sounds.
If transmission position [ is selected:X
Drive to a qualified specialist workshop without shifting th e trans -
mission from position [ .
If transmission position ^ , \\ or ] is selected:X
Secur e th e vehicl e against rollin g away ( Y
page 154).X
Notify a qualified specialist workshop or breakdown service.
Reversing Not Possi‐
ble Servic e Required You canno t shift int o transmission position ^ due to a malfunction .
The transmission position s ] , \\ or [ continu e to be available.
A warning tone also sounds. X
Visit a qualified specialist workshop .
Transmission Mal ‐
function Sto p A malfunction has occurred in th e mechanical transmission compo -
nents.
A warning tone also sounds. The transmission automatically shift s to
position \\ . X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Shift th e transmission to position ] .X
Secur e th e vehicl e against rollin g away ( Y
page 154).X
Notify a qualified specialist workshop or breakdown service.
Sto p Vehicl e Leave
Engine Runnin g Wai t
Transmission Cool‐
ing The transmission has overheated. Pullin g away can be temporarily
impaire d or no t possible.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions. Do no t continu e drivin g
under any circumstances. X
Leav e th e engin e running.X
Wait until th e display message disappear s before pullin g away.
e The tailgat e is open .
G WARNIN G
Whe n th e engin e is running, exhaust gase s can ente r th e vehicl e inte-
rio r if th e tailgat e is open .
There is a ris k of poisoning .X
Clos e th e tailgate. Display messages 25 3
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
f The hoo d is open . A warning tone also sounds.
G WARNIN G
The open hoo d may bloc k your vie w when th e vehicl e is in motion .
There is a ris k of an accident.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 154).X
Clos e th e hood.
Q At least on e door is open . A warning tone also sounds.X
Clos e all th e doors.
o Rea r Lef t Backrest
Not Latche d or Rea r
Right Backrest Not
Latche d Vehicl e wit h through-loading feature in th e rear bench seat :
The backrest in th e rear is no t engage d on th e left-han d and/o r right -
han d side . X
Push th e backrest bac k until it engages.
o Rea r Center Back‐
res t Not Engage d Vehicl e wit h through-loading facilit y in th e rear compartment:
The center rear seat backrest is no t engaged.X
Push th e backrest bac k until it engages.

Display messages
Possible causes/consequences and P Solutions
Becaus e there is interferenc e from a stron g source of radi o waves, th e
SmartKey is no t detecte d whils t th e engin e is running.
A warning tone also sounds. X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 154).X
Inser t th e SmartKey int o th e ignition loc k and drive in SmartKey
mode.

Safety systems Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
'M
Q ' (USA only), M (Canada only): the red brake system warning lamp is lit
while the engine is running.
A warning tone also sounds.
G WARNING
The brake boosting effect is malfunctioning and the braking characteristics may be
affected.
There is a risk 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
Secure the vehicle against rolling away ( Y
page 154).X
Consult a qualified specialist workshop. X
Observe the additional display messages in the multifunction display.
'M
Q ' (USA only), M (Canada only): the red brake system warning lamp lights
up while the engine is running.
A warning tone also sounds.
There is not enough brake fluid in the brake fluid reservoir.
G WARNING
The braking effect may be impaired.
There is a risk 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
Secure the vehicle against rolling away ( Y
page 154).X
Do not add brake fluid. Adding more will not correct the malfunction. X
Consult a qualified specialist workshop. X
Observe the additional display messages in the multifunction display.
'
Q USA only: the red brake system warning lamp is lit while the engine is running.
The multifunction display also shows a display message with the & symbol.
The brake pads/linings have reached their wear limit. X
Visit a qualified specialist workshop.258
Warning and indicator lamps in the instrument cluster
On-board computer and displays

Tires Warning/
indicator
lamp Q Signal type
Possible causes/consequences and P Solutions
w
Q The yellow tire pressure monitor warning lamp (pressure loss/malfunction) is lit.
The tire pressure monitor has detected a loss of pressure in at least one of the tires.
G WARNING
Tire pressures that are too low pose the following hazards: R
they may burst, especially as the load and vehicle speed increase. R
they may wear excessively and/or unevenly, which may greatly impair tire trac-
tion. R
the driving characteristics, as well as steering and braking, may be greatly
impaired.
There is a risk of an accident. X
Stop the vehicle without making any sudden steering or braking maneuvers. Pay
attention to the traffic conditions as you do so. X
Secure the vehicle against rolling away ( Y
page 154).X
Observe the additional display messages in the multifunction display. X
Check the tires and, if necessary, follow the instructions for a flat tire
( Y
page 321). X
Check the tire pressure ( Y
page 345).X
If necessary, correct the tire pressure.
w
Q The yellow tire pressure monitor warning lamp (pressure loss/malfunction)
flashes for approximately one minute and then remains lit.
The tire pressure monitor is faulty.
G WARNING
The system is possibly unable to recognize or register low tire pressure.
There is a risk of an accident. X
Observe the additional display messages in the multifunction display. X
Visit a qualified specialist workshop immediately.266
Warning and indicator lamps in the instrument cluster
On-board computer and displays