engine MERCEDES-BENZ GLS 2021 Manual Online

#
Obser vetheins truction sin the
Mer cedes-Ben zSpecif ications forOper‐
ating Fluids310.1. Ha
ve thecoolant regular lyreplaced ataqu alif ied
spec ialistwo rkshop.
The propor tionofcor rosion inhibit or/antifr eeze
concen trat ein theengine cooling system should
be:
R Aminimum of50% (antifr eezeprotect ion
do wn toappr oximat ely-3 5°F (-37°C))
R Amaxim umof55% (antifreeze protect ion
do wn to-49 °F(-45 °C)) Co
olant capacity Mode
lC apacity
GL S450 4MATIC 20.0USqt
(1 8.9 liter s)
GL S580 4MATIC 16.6 US qt
(1 5.7 lite rs) Mer
cede s‑Maybac hC apacity
Mer cedes -Maybach
GL S60 04MA TIC 20
.0US qt
(1 8. 9liter s) No
teson windshield washer fluid Obser
vetheno teson oper ating fluids
(/ page39 4). &
WARNIN G‑Ri sk offire and injuryfrom
wind shieldwa sher concen trat e
Wi ndsh ield wa sher concen trat eis highly
fl ammab le.Itcoul dign ite if it com esinto
con tact with hotengine component partsor
th eex haus tsy stem. #
Mak esur eth at no wind shieldwa sher
concen trat espills outnext to thefiller
open ing. *
NO
TEDama getotheex terior lighting
due touns uitable windshieldwa sher fluid Uns
uitable windshieldwa sher fluid maydam‐
ag eth eplas ticsur face oftheex terior light‐
ing. #
Onlyuse windshield washer fluid whic h
is also suitable foruse onplastic sur fa‐
ces, e.g.MBSumm erFitor MB Winter‐
Fit. *
NO
TEBlocked spr aynozzl escau sed by
mixing windshieldwa sher fluids #
Donotmix MBSum merFitand MBWin‐
te rFit withot her windshield washer flu‐
ids. Do
notuse distilled orde- ionizedwa teras thefill
le ve lsen sor maybe trigg ered erro neou sly. Te
ch nica lda ta 399

Mer
cede s‑Maybac h
Ve hicle widthexc luding out‐
side mirrors,min. tomax. 79.9
in
(2030 mm)
Maximu mvehicle height 74.3 in
(1 888 mm)
Mini mum vehicle height (high‐
wa ydr ivin gleve l) 72
.3 in
(1 838 mm)
Whe elba se 123.4 in
(3 13 5mm)
Maxi mum ground clearance 8.2in
(2 10 mm) We
ight sand loads Please
note that forth especif iedvehicle data:
R Items ofoptional equipment increase the
curb weight andreduce thepa yload. Ro
ofload All
mod els
Maxim umroof load 220lb(100 kg) Ru
nning board All
models
Maximum load 440lb (200 kg) Of
f-road driving Fo
rding dep th
* NO
TEDama gecau sed bywaterwhen
fo rd ing Wa
tercan entertheengine compartmen t
and vehicle interior if:
R youexc eed themaximum permissible
fo rd ing dep thwhen drivin gth ro ugh stand‐
ing water
R abo wwav efo rm sdur ing ford ing R
wateraccumu lates dur ing ford ing offlow ‐
ing water #
Donotexc eed themaximum permissi‐
ble ford ing dep thand drive slo wly
th ro ugh thewa ter. The
specif iedvalue indic ates themaximum per‐
missible ford ing dep thfor:
R vehicles that arere ady todrive
R slowdriving thro ugh standi ngwater
Dr iving thro ugh flow ing waterre duces theper‐
missible ford ing dep thdue totheaccumulation
of wa ter.
Obser vetheno teson off-r oad driving andford ‐
ing (/ page17 6). Te
ch nica lda ta 403

Tr
aile rhitc h Gene
ralno teson thetrailer hitch Modif
ications totheengine cooling system may
be neces sary,dependin gon theve hicle model.
The retrof itti ng ofatrai le rhi tc his only perm issi‐
ble ifato wing capac ityisspec ified inyour vehi‐
cle documents.
Fu rther information canbeobt ained ataqu ali‐
fi ed specialis two rkshop. To
wing capacit y The
tongu ewe ight isno tinc luded intheto wing
capac ity. Mod
el Towing capacit y,
br ak ed
All models 7716 .2 lbs(3 500 kg) Mer
cede s‑Maybac hT owing capa city,
br ak ed
All models 7716 .2 lbs(3 500 kg) Maximum
tongue weight andload capacity *
NO
TEDama gecau sed bythetrailer
comin gloose If
th eto ngu ewe ight used istoolow, the
tr ai le rma ycome loose . #
Theto ngu ewe ight mustno tbe belo w
11 0.2 lb(50 kg). #
Use ato ngu ewe ight that isas clo seas
poss ibletothemaximum permissible
to ngu ewe ight . *
NO
TEDama gecau sed bythebicy cle
ra ck comi ngloose Whe
nus ing abi cy cle rack ,bo th themaximal
to ngu ewe ight andthemaximal loadcapacity
should beobser ved. #
Donotexc eed theper missible load
capacity . Obser
vetheadditional noteson load capacity .To
ngue weight Model
Maximumtongue
we ight
All models 617.3 lbs (280 kg) Mer
cede s‑Maybac hM aximum tongue
we ight
All models 617.3 lbs (280 kg) Missing
values werenotye tav ailable atthetime
of going topress.
Load capacit y Model
Maximumload
All models Mer
cedes‑Ma ybachM aximumload
All mode ls Pe
rm issible rear axle load (traile roper ation ) Miss
ingvalues werenotav ailable atthetime of
going topress. 406
Tech nica lda ta

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
Á Key NotDetected (red dis‐
pla ymessag e) *T
heSmar tKey canno tbe detected and mayno long erbe intheve hicle.
The Smar tKey isno long erintheve hicle andyouswit choffth eengine:
R Youcan nolongerst ar tth eengine.
R Youcan notcen trally lockth eve hicle. #
Ensur eth at theSmar tKey isin theve hicle.
If th eSmar tKey detection functi onhasa mal functi ondueto ast ro ng radio signal source: #
Stop theve hicle immediat elyinaccor dance withth etraf fic condi tions. #
PlacetheSmar tKey inthemar kedspace forst ar tin gth eengine withth eSmar tKey (/ pag e16 9).
Pl ac ethe Key inthe
Ma rked SpaceSee Opera -
tor' sMa nua l *S
mar tKey detection ismal functi oning. #
Chang eth elocation oftheSmar tKey intheve hicle. #
Place theSmar tKey inthemar kedspace forst ar tin gth eengine withth eSmar tKey (/ pag e16 9).
Á Don't ForgetYour Key *A
warning tone willal so sou nd. Thismes sage reminds youto take your Sm artK ey wit hyo uwhen youlea vethe
ve hicle. Displa
ymessag esand warning/ indic ator lam ps 41
3

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions &
DANG ER Risk ofexhaus tga spoisoning
Combus tionengines emitpoisonous exhaus tga ses suchas carbon monoxide.Exhaus tga ses can enterthe
ve hicle interior ifth eta ilg ateis open when theengine isrunning ,esp ecially ifth eve hicle isin mo tion. #
Alw aysswitc hof fth eengine beforeopening theta ilg ate. #
Neverdr ive wit hth eta ilg ateopen . #
Close theta ilg ate.
LOW RANGE OnlyWhen
Vehic leIsStation ary *O
neormor eshi fting con dition sha ve notbe en met. #
Stop theve hicle. #
Eng ageneutr al005C. #
Repeat thege ar chang e.
LOW RANGEShift toPosi -
tio nN Briefly *O
neormor eshi fting con dition sha ve notbe en met. #
Eng ageneu tral 005C. #
Repeat thege ar chang e.
LOW RANGENot inDrive
Pro gram "Sport" *Y
ouwill notbe able toselect theLO WRANGE off-r oad gear ifth edr ive pr ogr am C orB isswitc hedon.
The drive pr og ram ther efor eaut omaticall yswitc hestoA . #
Select theLO WRANGE off-r oad gear (/ page19 0). 420
Displaymessa gesand warning/ indic ator lam ps

Engine
Displa
ymes sages
Possible causes/conseq uencesand0050 0050
Solutions
To switch engine off,press
and hold Start/S topbut-
ton foratleast 3secon ds
or press 3times. *Y
ouhave pressed thest ar t/ stop butt onwhile theve hicle isin mo tion. #
Information aboutswitchingoffth eengine whiledriving (/page16 9).
00BD
Che ckCoo lant Level See
Opera tor'sManu al *T
hecoolant leve lis toolow.
* NO
TEEngi nedama gedue toinsuf ficie ntcool ant #
Avoid long journeys wit hins ufficie ntcool ant. #
Addcoolant (/page326 ). #
Have theengine cooling system checkedat aqu alif ied spec ialistwo rkshop.
ÿ
Coola ntToo HotStop Vehi-
cle Turn Engine Off *T
hecoolant istooho t. #
Pull overand stop theve hicle safely and switc hof fth eengine, paying attent ion toroad and traffic condi tions. &
WARNIN GDang erofburnswhen opening thehood
If yo uopen thehood when theengine hasoverheat edordur ing afire intheengine compartmen t,yo uco uld
co me intoco ntact withho tga ses orother escaping operating fluids. #
Beforeopen ingthehood, allowtheengine tocool down. Disp
lay mess ages and warning/ indic ator lam ps 423

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions #
Intheeve ntofafire intheengine compartmen t,ke ep thehood closed andcallthefire ser vice. #
Waitunt ilth eengine hascooled down. #
Mak esur eth at theair supply tothera diat orisno tobs truct ed. #
Avoiding highloads ontheengine, drive to thenear estqu alif ied spec ialistwo rkshop. Indoing so,ensur eth at
th ecoolant temp eratur edispla yre mains belowthere dmar king.
ÿ *T
hefanmo toris faulty . #
Avoiding highloads ontheengine, drive to thenear estqu alif ied spec ialistwo rkshop. Indoing so,ensur eth at
th ecoolant temp eratur edispla yre mains belowthere dmar king.
00B6
Fuel Level Low *T
hefuel supply hasdropped intoth ere ser verang e. #
Refuel .
00B6
Ga sCa pLoose *T
hefuel filler cap isno tclos edcor rectly orthefuel system isleaking. #
Close thefuel filler cap. #
Ifth efuel filler cap wasalr eady proper lyclosed :con sult aqu alif ied spec ialistwo rkshop. 42
4
Displa ymessag esand warning/ indic ator lam ps

Tr
ansmis sion Di
spla ymessag es
Possible causes/conseq uencesand0050 0050
Solutions
Only Shift to'P' when Vehi-
cle isStationary *
Pa rk position 005Dcan beeng aged onlywhen theve hicle isstatio nary. #
Tostop, depr essthebr ak epedal. #
Shif tth etra nsmiss iontopar kposition 005Dwhile theve hicle isstatio nary.
App lyBra ketoShi ftfrom
'P' *
Yo uha ve attem pte dto shif tth etra nsmiss ionout ofpar kposition 005Dand intoano ther tra nsmiss ionposition . #
Depr essthebr ak epedal. #
Select transmiss ionposition 005B,005Eorneutr al005C.
To Deselec tP or N,
Depress Brakeand Start
En gine *
Yo uha ve attem pte dto shif tth etra nsmiss ionout ofpar kposition 005Dorneutral 005Cand intoano ther tra nsmiss ion
position . #
Depr essthebr ak epedal. #
Chang eth etra nsmiss ionposition . #
Startth eengine.
Apply Braketo Shift toDor
R *
Youha ve attem pte dto select transmission position005Bor005E. #
Depr essthebr ak epedal. #
Select transmiss ionposition 005Bor005E.
Apply Braketo Shift to'R' *
Youha ve attem pte dto select transmission position005E. #
Depr essthebr ak epedal. #
Select transmiss ionposition 005E. Displa
ymessag esand warning/ indic ator lam ps 425

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions #
Consult aqu alif ied spec ialistwo rkshop.
Stop Vehicle LeaveEngine
Running WaitTransmission
Cooli ng *T
hetransmission isove rheating. Pullingaway ma ybe temp orarily im pair edornotpossible. #
Stop theve hicle immediat elyinaccor dance withth etraf fic condi tions.Do notcontinu edr ivi ng. #
Lea vetheengine running . #
Waitunt ilth edispla ymessag edisappear sbef orepulling away.
Auxi liar yBatte ryMa lfunc-
tio n *T
heauxilia rybatt eryfo rth etra nsmiss ionisno long erbeing charge d. #
Consult aqu alif ied spec ialistwo rkshop. #
Untilthen, alwaysselect parkposition 005Dmanually beforeyo uswit choffth eengine. #
Beforelea ving theve hicle, apply theelectr icpar king brak e. Displa
ymessag esand warning/ indic ator lam ps 42
7

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
or #
Ifth edispla ymessag edoes notdisappear ,st op theve hicle inaccor dance withth etra ffic con dition sand restar t
th eengine.
Blind SpotAssist Inopera-
tive *B
lind SpotAss istis malfun ctionin g. #
Consult aqu alif ied spec ialistwo rkshop.
Blind SpotAssist NotAvail-
able When Towing aTrailer
See Operator's Manual *W
hen youes tablish theelectr icalconnect iontothetra iler ,Blind SpotAssis tis una vailable. #
Press thelef t-hand Touc hCon trol and ackn ow ledg eth edispla ymessag e.
Act ive Blind SpotAssist
Current lyUnavailable See
Operator 'sManual *A
ctiv eBli nd Spo tAssi stistemp orarily una vailable.
The system limits have been reac hed (/page26 4). #
Drive on .
On ce thecause ofthepr oblem isno long erpresent ,th esy stem will beavailable again.
or #
Ifth edispla ymessag edoes notdisappear ,st op theve hicle inaccor dance withth etra ffic con dition sand restar t
th eengine.
Act ive Blind SpotAssist
Inoper ative *A
ctiveBli nd Spo tAssi stismalfun ctionin g. #
Consult aqu alif ied spec ialistwo rkshop. 44
0
Dis play messa gesand warning/ indic ator lam ps