check engine light MERCEDES-BENZ GLC SUV 2021 Owners Manual

#
Ifth e bonn etcan still be lif ted slightl y,open
th e bonn etagain and close it with a little
more forc e until it engages cor rectly. Engine oil
Che
cking the engine oil le vel using the oil
dip stick &
WARNING Risk of burn s from hot com‐
ponent parts in the engine compartment
Cer tain component parts in the engine com‐
partment can be very hot, e.g. the engine,
th e cooler and parts of theex haust sy stem. #
Allow the engine tocool down and only
to uch co mponent parts described in
th efo llowing. *
NO
TEPlug-in hybrid #
Obser vethe no tes in the Supplement.
Yo u could otherwise failto recognise
dangers. Re
quirements:
R The engine has an oil dipstic k.If not, the
engine oil le vel can be checked only with the
on-board computer (/ page 302) .
Depending on the engine, the oil dipstick may be
ins talled in the engine compartment in dif fere nt
locations.
The waiting time before checking the oil le vel
when the engine is at normal operating temp era‐
ture is five minutes. #
Park theve hicle on a le vel sur face. #
Pull oil dipstick 1out and wipe off. #
Slowly slide oil dipstick 1into the guide
tube tothestop, and pull it out again af ter
about thre e seconds.
R Oil le vel is cor rect: oil le vel is between 2
and 3.
R Oil le velto o low: oil le vel is at 3or
belo w. Maintenance and care
301

&
WARNING Risk ofexplosion during
ch arging process and starting assis tance
During thech arging process and starting
assis tance, the battery may release an explo‐
sive gas mixture. #
Avoid fire , naked flames, creating
spar ksand smoking. #
Make sure there is suf ficient ventila‐
tion. #
Do not lean over a batter y. &
WARNING Risk ofexplosion from a fro‐
zen battery
A dischar ged battery may freeze at temp era‐
tures slightly abo veor below freezing point.
During starting assis tance or battery charg‐
ing, bat tery gas can be released. #
Alw ays allow a battery tothaw before
ch arging it or per form ing starting assis‐
ta nce. If
th e indicator/warning lamps in the instrument
clus ter do not light up at low temp eratures, it is
ve ry likely that the dischar ged battery has fro‐
zen. In this case you may neither jump-s tart the
ve hicle nor charge the batter y.
The service life of a battery that has been
th awe d may be dramatically shor tened. The
st arting characteristics may be impaired, espe‐
cially at low temp eratures.
It is recommended that you ha veathaw ed bat‐
te ry checked at a qualified specialist workshop.
Plug-in hybrid: be sure toobser vethe no tes in
th e Supplement. You could otherwise failto rec‐
ognise dangers.
All vehicles
* NO
TEDama gecaused bynumerous or
ex tended attempt sto start the engine Nume
rous or extended attempt sto start the
engine may damage the catalytic con verter
due tonon-combu sted fuel. #
Avoid numerous and extended attem pts
to start the engine. Obser
vethefo llowing points during starting
assis tance and when charging the battery:
R Only use undamaged jump lead/charging
cables with a suf ficient cross-section and
insula tedte rm inal clamps.
R Non- insulated parts of thete rm inal clamps
must not come into con tact with other me tal
parts while the jump lead/charging cable is
connected tothe battery/jump-s tart connec‐
tion point.
R The jump lead/charging cable must not
come into contact wi thany parts which may
mo vewhen the engine is running.
R Alw ays make sure that nei ther you nor the
battery is elect rostatically charge d.
R Keep away from fire and naked flames.
R Do not lean overth e batter y.
Obser vethe additional following points when
ch arging the battery:
R Only use battery charge rs tested and
appr oved for Mercedes-Benz.
R Read the battery charge r's operating instruc‐
tions before charging the batter y. 324
Breakdown assis tance

Brakes
Wa
rning/indicator lamp
Possible causes/consequences and M MSolutions
! Elect ric pa rking brake indi‐
cator lamp (red)
!
The elect ric pa rking brake
(yellow) indicator lamp *T
he red elect ric pa rking brake indicator lamp flashes or is lit.
The yellow elect ric pa rking brake indicator lamp also lights up in theev ent of a malfunction. #
Notethe messages on the multifunction displa y.
J
Brake sy stem warning lamp
(yellow) *T
he yellow brake sy stem warning lamp is lit while the engine is running. &
WARNING Risk of an accident due toa brake sy stem malfunction
If th e brake sy stem is malfunctioning, braking characteristics may be impaired. #
Drive on carefull y. #
Have the brake sy stem checked immediately at a qualified specialist workshop. #
Adjust your speed and drive on carefull y,leaving a suitable dis tance totheve hicle in front. #
Ifth e multifunction display sho wsa display message, obse rve it. Display messages and
warning/indicator lamps 433

Setting
the climate style........................ 14 4
Setting the fragrance sy stem.................1 45
Setting theve hicle interior temp era‐
ture........................................................ 14 2
St ationary heater/ ventilation................ 147
Switching on/of f................................... 14 3
Switching there ar wind owheater
on/off................................................... 14 2
THERMATIC contro l panel...................... 14 2
THERMOTRONIC contro l panel..............142
Ve ntilating theve hicle (con venience
opening).................................................. 88
Climate style
Fu nction................................................ 14 4
Setting................................................... 14 4
Clo thes hook .............................................. 11 6
Cockpit Overview................................................... 6
Cof fee cup symbol
see ATTENTION ASSIST
Collision de tection (pa rked vehicle)
Information............................................ 182
Combination switch .................................. 12 9Compu
ter
see On-board computer
Con venience closing ................................... 88
Con venience opening ..................................88
Coolant (engine) Check le vel............................................ 304
No tes....................................................3 65
Cooling see Clima tecontrol
Co pyright..................................................... 37
Cornering light .......................................... .130
Cross Traf fic Alert..................................... 237
Crosswind Assist Function/no tes..................................... 188
Cruise control Activating.............................................. 194
Buttons.................................................. 194
Calling up a spee d................................. 194
Deactivating.......................................... 194
Fu nction................................................ 19 3
Re quirements........................................ 194
Selecting............................................... 194
Setting a speed...................................... 194St
oring a speed.....................................1 94
Sy stem limitations................................. 19 3 D
Dashboa rd
see Cockpit
Data acquisition Vehicle.................................................... 34
Data pr otection rights
Data storage............................................ 37
Data storage
Data pr otection rights............................. 37
Electronic control units........................... 34
Online services........................................ 36
Ve hicle.................................................... 34
Deactivating the alarm (A TA )...................... 94
Deale rship
see Qualified speciali stwo rkshop
Declaration of conformity Electromagnetic compatibility.................26
Jack......................................................... 29
Specific absor ption rate.......................... 26
TIREFIT kit............................................... 30 446
Index

Wi
reless vehicle components.................. 26
Decorative foil (cleaning instructions) .... 308
DeNOx agent see AdBlue ®
De stination entry
En tering a POI or address...................... 269
De tecting inat tentiveness
see ATTENTION ASSIST
Diagnostics connection .............................. 30
Diesel Low outside temp eratures..................... 360
No tes....................................................3 60
Digital Owner's Manual .............................. 20
Dinghy towing
see Tow- bar sy stem
DIRECT SELECT le ver
Engaging drive position........................ .168
Engaging neutral................................... .167
Engaging pa rkposition.......................... 16 8
Engaging pa rkposition automatically.... 16 8
Engaging reve rsege ar........................... 167
Fu nctio n................................................ 16 6Display (care)
.............................................3 10
Display (MBUX multimedia sy stem)
Home screen........................................ .255
Operating.............................................. 256
Display (on-board comp uter)
Displ ays on the multifunction displa y.... 251
Displ aymessage
Calling up (on-board compu ter)............. 370
No tes..................................................... 370
Display messages ¯ - - - km/h .................................... .397
ç - - - km/h ..................................... 398
È - - - km/h ..................................... 397
# 12V battery See Owner's Man‐
ual..........................................................4 12
Û 48 V battery See Owner's Man‐
ual.......................................................... 414
: Active Light Sy stem inoperative... 377
¯ AdBlue sy stem fault Emer. op.:
max. XXX mphSt art not poss. in XXX
miles .................................................... .422 ¯
AdBlue sy stem fault Emer‐
ge ncy op. in XXX km See Owner's
Manual.................................................. 421
¯ AdBlue sy stem fault Engine
st art not possible................................. .422
¯ AdBlue sy stem fault See Own‐
er's Manual ............................................ 421
5 Add 1 litre engine oil when
next refuelling ....................................... 423
é ATTENTION ASSIST inoperative ....396
é ATTENTION ASSIS T:Take a
break! .................................................... 396
: Automatic driving lights inoper‐
ative....................................................... 376
Á Changekey bat teries .................... 374
J Check brake fluid le vel................. 395
# Check brake pads See Owner's
Manual.................................................. 395
5 Check engine oil le vel when
next refuelling ....................................... 423 Index
447

ï
Check trailer hit chlock............... .382
h Checktyre(s)................................ 416
! Clean the fuel filter ...................... 388
ÿ Coolant Stop vehicle Switch
engine off..............................................3 86
! currently una vailable See Own‐
er's Manual .......................................... .407
÷ currently una vailable See Own‐
er's Manual .......................................... .408
5 Engine oil le vel cannot be
measured .............................................. 425
5 Engine oil le velRe duce oil le vel.... 424
5 Engine oil le velSt op vehicle
Switch engine off................................... 424
5 Engine oil pressure Stop
Switch off engine.................................. 425
ä Fault Drive at max. 80 km/h........ 404
6 Front left malfunction Consult
wo rkshop (e xample).............................. 371
& inoperative Battery low................ 380 &
inoperative Refuel vehicle ............ 380
& inoperative See Owner's Man...... 380
! inoperative See Owner's Man‐
ual......................................................... 408
÷ inoperative See Owner's Man‐
ual......................................................... 409
T inoperative See Owner's Manual. .410
G Inoperative.................................... 412
: Intellige nt Light Sy stem inoper‐
ative...................................................... 377
Á Key not de tected (red displ ay
messa ge)............................................... 375
Á Key not de tected (white display
messa ge)............................................... 374
: Left dipped beam (e xamp le)........ .376
6 Left windowbag malfunction
Consult workshop (e xample)................ .371
 Lowe ring...................................... 405
: Malfunction See Owner's Man‐
ual......................................................... 376ð
Maximum speed exceeded ........... 399
Ø ..................................................... 420
ç Off................................................3 98
ë Off................................................ 396
ï Operation only possible in
transmission position P......................... 381
! Parking brake See Owner's
Manual .................................................. 391
Á Please reduce speed .................... 406
Ý Please wait 48 V battery charg‐
ing .......................................................... 414
_ Rear left seat backrest not
loc ked (Example)................................... 385
h Rectify tyre pressure..................... 417
Ø Refill Ad Blue See Owne r’s
Manual.................................................. 420
! Release parking brake .................. 394
¸ Replace air cleaner ...................... 388
Á Replace key.................................. 374
8 Reser vefuel le vel......................... 388 448
Index

Risk of
vehicle rolling Driver door
open and transmission not in P............. 389
Ru n Flat Indicator inope rative............... .419
Speed limit (winter tyres) XXX km/h..... 399
St op vehicle Lea veengine running
Wa itTransmission cooling .....................390
To shift out of P or N,depress brake
and start engine.................................... 389
To switch off the engine, press
St art/ Stop button for at least 3 sec‐
onds or 3 times. ................................... .386
Tr af fic Sign Assi stCamera view
re stricted See Owner's Manual............. 401
Tr af fic Sign Assi stcur rently una vaila‐
ble See Owner's Manual ........................ 400
Tr af fic Sign Assi stinope rative ............... 401
Tr ansmission Malfunction Stop............. 390
Ty re press. monitor cur rently una vail‐
able ........................................................ 41 5
Ty re press. monitor inoperative.............. 41 5Ty
re press. monitor inoperative No
wheel sensors ........................................ 416
Ty re pressure Check tyres .....................419
Ty re(s) ove rheated................................. 41 8
Wi thout changing gear, consult work‐
shop......................................................3 90
Display on the windscreen
see Head-up display
Distance control see Active Dis tance Assi stDISTRONIC
DI STRO NIC
see Active Dis tance Assi stDISTRONIC
Door Additional door loc k................................ .76
Child saf ety lock (rear door).................... 70
Locking/unlocking (emer gency key)....... 80
Opening (from inside ).............................. 77
Un locking (from inside).......................... .77
Door cont rol panel....................................... 16
Dr aw bar
see Tow- bar sy stem
Drive Away Assist ...................................... 236 Drive
Away Assist
see Pr otection against collision
Drive position Enga ging................................................1 68
Drive prog ram display ............................... 16 5
Drive prog rams
see DYNA MIC SELECT
Driver's seat see Seat
Driving abroad Light adjustment (low beam)................. 127
Driving saf ety sy stem
ABS (Anti-lock Braking Sy stem).............1 86
Ac tive Brake Assi st................................ 206
Ad aptive brake lights............................. 191
BA S (Brake Assi stSystem).................... 186
Cameras............................................... .184
EBD (Electronic Brake forc e Distribu‐
tion).......................................................1 89
ESP ®
Crosswind Assist.......................... 188
ESP ®
trailer stabilisation.......................1 88
Overview.............................................. .185
Ra dar and ultrasonic sensor s................ 184
Re sponsibility........................................1 84 Index
451