Get Wheels and tires -> Tire pressure Guide for Mercedes GLC Class SUV First Generation (2015-2021)

460 Wheels and tires

Tire pressure which is too low can cause:

Tire pressure

Notes on tire pressure

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before embarking on a longer journey

if operating conditions change, e.g. off-

road driving

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Tire defects as a result of overheating.

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Impaired handling characteristics.

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WARNING Risk of accident due to insuf‐

ficient or excessive tire pressure

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Irregular wear.

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Adjust the tire pressure as necessary.

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Increased fuel consumption.

Underinflated or overinflated tires pose the

following risks:

Tire pressure which is too high or too low can:

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WARNING Risk of accident from exces‐

sive tire pressure

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Shorten the service life of the tires.

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The tires may burst, especially as the

load and vehicle speed increase.

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Cause increased tire damage.

Tires with excessively high pressure can

burst because they are damaged more easily

by highway fill, pot holes etc.

In addition, they also suffer from irregular

wear, which can significantly impair the brak‐

ing properties and the handling characteris‐

tics.

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Adversely affect driving characteristics and

thus driving safety, e.g. due to hydroplaning.

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The tires may wear excessively and/or

unevenly, which may greatly impair tire

traction.

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WARNING Risk of an accident due to

insufficient tire pressure

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The driving characteristics, as well as

steering and braking, may be greatly

impaired.

Tires with pressure that is too low can over‐

heat and burst as a result.

In addition, they also suffer from excessive

and/or irregular wear, which can significantly

impair the braking properties and the han‐

dling characteristics.

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Avoid excessively high tire pressures in

all the tires, including the spare wheel.

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Comply with the recommended tire

pressure and check the tire pressure of

all tires including the spare wheel regu‐

larly:

Tire pressure which is too high can cause:

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Increased braking distance.

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at least once a month

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Avoid excessively low tire pressures in

all the tires, including the spare wheel.

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Impaired handling characteristics.

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when the load changes

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Irregular wear.

Wheels and tires 461

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Impaired driving comfort.

Susceptibility to damage.

Observe the maximum tire pressure

(/ page 473).

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WARNING Risk of accident due to

unsuitable accessories on tire valve

Use a suitable pressure gauge to check the tire

pressure. The outer appearance of a tire does

not permit any reliable conclusion about the tire

pressure.

Vehicles with a tire pressure monitoring sys‐

tem: You can also check the tire pressure using

the on-board computer.

If you mount unsuitable accessories onto tire

valves, the tire valves may be overloaded and

malfunction, which can cause a loss of tire

pressure. Aftermarket tire pressure monitor‐

ing systems will cause the tire valve to

remain open, depending on the design. This

can also result in a loss of tire pressure.

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WARNING Risk of accident caused by

repeated drop in tire pressure

If the tire pressure drops repeatedly, the

wheel, valve or tire may be damaged.

Insufficient tire pressure can cause the tires

to burst.

Only correct tire pressure when the tires are

cold. Conditions for cold tires:

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Only screw standard valve caps or valve

#

Inspect the tire for signs of foreign

objects.

Check whether the wheel or valve has a

leak.

If you are unable to rectify the damage,

contact a qualified specialist workshop.

caps specifically approved by

Mercedes-Benz for your vehicle onto

the tire valve.

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The vehicle has been parked with the tires

out of direct sunlight for at least three hours.

#

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The vehicle has traveled less than 1 mile

(1.6 km).

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Trailer operation notes

Always inflate the rear axle tires to the recom‐

mended tire pressure on the tire pressure table

for increased load.

A rise in the tire temperature of 18 °F (10 °C)

increases the tire pressure by approx. 10 kPa

(0.1 bar/1.5 psi). Take this into account when

checking the tire pressure of warm tires.

The tire pressure recommended for increased

load/speed in the tire pressure table can affect

the ride comfort.

You can find information on tire pressure for the

vehicle's factory-installed tires on the following

labels:

Tire pressure table

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Tire and Loading Information placard on the

B‑pillar of your vehicle (/ page 467).

The tire pressure table is on the inside of the

fuel filler flap.

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Tire pressure table on the inside of the fuel

filler flap (/ page 461).

462 Wheels and tires

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% The data shown in the images is example

Maximum tire pressure (/ page 473)

data.

Checking tire pressures manually

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Read the tire pressure for the current operat‐

ing conditions from the Tire and Loading

Information placard or the tire pressure

table. Observe the notes on tire pressure.

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Remove the valve cap of the tire to be

checked.

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Press the tire pressure gauge securely onto

the valve.

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Read the tire pressure.

If the tire pressure is lower than the recom‐

mended value, increase the tire pressure to

the recommended value.

If the tire pressure is higher than the recom‐

mended value, release air. To do so, press

down the metal pin in the valve, e.g. using

the tip of a pen for example. Then check the

tire pressure again using the tire pressure

gauge.

The tire pressure table shows the recommended

tire pressure for all tires approved for this vehi‐

cle. The recommended tire pressures apply for

cold tires under various operating conditions, i.e.

loading and/or speed of the vehicle.

If one or more tire sizes precede a tire pressure,

the tire pressure information following is only

valid for those tire sizes.

The load conditions "partially laden" and "fully

laden" are defined in the table for different num‐

bers of passengers and amounts of luggage. The

actual number of seats may differ from this.

#

Some tire pressure tables only show the rim

diameter instead of the complete tire size, e.g.

R18. The rim diameter is part of the tire size and

can be found on the tire side wall (/ page 474).

Be sure to also observe the following further

related subjects:

#

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Notes on tire pressure (/ page 460)

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Screw the valve cap onto the valve.

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Tire and Loading Information placard

(/ page 467)

Wheels and tires 463

Further related subjects:

As an added safety feature, your vehicle has

been equipped with a tire pressure monitor‐

ing system (TPMS) that illuminates a low tire

pressure telltale when one or more of your

tires is significantly under-inflated. Accord‐

ingly, when the low tire pressure telltale illu‐

minates, you should stop and check your

tires as soon as possible, and inflate them to

the proper pressure. Driving on a signifi‐

cantly under-inflated tire causes the tire to

overheat and can lead to tire failure. Under-

inflation also reduces fuel efficiency and tire

tread life, and may affect the vehicle’s han‐

dling and stopping ability.

Please note that the TPMS is not a substitute

for proper tire maintenance, and it is the

driver’s responsibility to maintain correct tire

pressure, even if under-inflation has not

reached the level to trigger illumination of

the TPMS low tire pressure telltale.

the low tire pressure telltale. When the sys‐

tem detects a malfunction, the telltale will

flash for approximately one minute and then

remain continuously illuminated. This

sequence will continue upon subsequent

vehicle start-ups as long as the malfunction

exists.

When the malfunction indicator is illumina‐

ted, the system may not be able to detect or

signal low tire pressure as intended. TPMS

malfunctions may occur for a variety of rea‐

sons, including the installation of replace‐

ment or alternate tires or wheels on the vehi‐

cle that prevent the TPMS from functioning

properly.

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Notes on tire pressure (/ page 460)

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Tire pressure table (/ page 461)

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Tire and Loading Information placard

(/ page 467)

Tire pressure monitoring system

Function of the tire pressure monitoring sys‐

tem

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DANGER Risk of accident due to incor‐

rect tire pressure

Each tire, including the spare (if provided),

should be checked monthly when cold and

inflated to the inflation pressure recommen‐

ded by the vehicle manufacturer on the vehi‐

cle placard or tire inflation pressure label. (If

your vehicle has tires of a different size than

the size indicated on the vehicle placard or

the tire inflation pressure label, you should

determine the proper tire inflation pressure

for those tires).

Always check the TPMS malfunction telltale

after replacing one or more tires or wheels

on your vehicle to ensure that the replace‐

ment or alternate tires and wheels allow the

TPMS to continue to function properly.

Your vehicle has also been equipped with a

TPMS malfunction indicator to indicate when

the system is not operating properly. The

TPMS malfunction indicator is combined with

The system checks the tire pressure and the tire

temperature of the tires installed on the vehicle

by means of a tire pressure sensor.

464 Wheels and tires

New tire pressure sensor, e.g. in winter tires, are ues by restarting the tire pressure monitoring

On-board computer:

automatically taught-in during the first journey

they are used.

The tire pressure and the tire temperature

appear in the multifunction display

(/ page 464).

If there is a substantial pressure loss or if the

tire temperature is excessive, you will be warned

in the following ways:

system manually (/ page 465).

4

5

Service

Tires

System limits

The system may be impaired or may not function

in the following situations:

One of the following displays appears:

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Current tire pressure and tire temperature of

the individual wheels:

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the tire pressure has been set incorrectly

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there is a sudden pressure loss caused, for

example, by a foreign object penetrating the

tire

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via display messages (/ page 546)

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there is a malfunction caused by another

radio signal source

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via the h warning lamp in the instrument

cluster (/ page 566)

Make sure to observe the following further rela‐

ted subject:

The tire pressure monitoring system is only an

aid. It is the driver's responsibility to set the tire

pressure to the recommended cold tire pressure

suitable for the operating situation. Set the tire

pressure for cold tires using a tire pressure

gauge. Note that the correct tire pressure for the

current operating situation must first be taught-

in to the tire pressure monitoring system.

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notes on tire pressure (/ page 460)

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Tire pressure will be displayed after driving a

Checking the tire pressure with the tire pres‐

sure monitoring system

Requirements:

few minutes

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Tire Pressure Monitor Active: the teach-in

process of the system is not yet complete.

The tire pressures are already being moni‐

tored.

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The ignition is switched on.

In most cases, the tire pressure monitoring sys‐

tem will automatically update the new reference

values after you have changed the tire pressure.

You can, however, also update the reference val‐

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Compare the tire pressure with the recom‐

mended tire pressure for the current operat‐

Wheels and tires 465

Radio-equipment approval of the tire pres‐

sure monitoring system

ing condition (/ page 461). Observe the

notes on tire temperature (/ page 460).

On-board computer:

4

5

Service

Tires

% The values displayed in the multifunction dis‐

play may deviate from those of the tire pres‐

sure gauge as they refer to sea level. At high

altitudes, the tire pressure value indicated by

a pressure gauge are higher than those

shown by the on-board computer. In this

case, do not reduce the tire pressure.

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Radio equipment approval numbers

Swipe downwards on Touch Control on the

left-hand side of the steering wheel.

The Use Current Pressures as New Refer-

ence Values? message is shown in the multi‐

function display.

Country

Radio type approval number

Canada

IC: 2546A-GG4T

IC: 2546A-DG6W2D4

IC: 2546A-MC34MA4

#

To begin restart, press Touch Control on the

left-hand side of the steering wheel.

Make sure to observe the following further rela‐

ted subject:

The Tire Press. Monitor Restarted message is

USA

FCC ID: MRXGG4T

shown in the multifunction display.

FCC ID: MRXDG6W2D4

FCC ID: MRXMC34MA4

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Notes on tire pressure (/ page 460)

Current warning messages are deleted and

the yellow h warning lamp goes out.

After you have been driving for a few

minutes, the system checks whether the cur‐

rent tire pressures are within the specified

range. The current tire pressures are then

accepted as reference values and monitored.

Restarting the tire pressure monitoring sys‐

tem

Requirements:

Further information on the declaration of con‐

formity for wireless vehicle components

(/ page 25).

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The recommended tire pressure is correctly

set for the respective operating status on

each of the four wheels (/ page 460).

Tire pressure loss warning system

Make sure to observe the following further rela‐

ted subject:

Restart the tire pressure monitoring system in

the following situations:

Function of the tire pressure loss warning

system

The tire pressure loss warning system warns the

driver by means of display messages when there

is a severe tire pressure loss.

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Notes on tire pressure (/ page 460)

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The tire pressure has changed.

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The wheels or tires have been changed or

newly installed.

466 Wheels and tires

After a change in tire pressure, a wheel rotation

or a tire change, or if you have re-installed

wheels or tires, the tire pressure loss warning

system has to be restarted (/ page 466).

The tire pressure loss warning system does not

replace the need to regularly check the tire pres‐

sure.

Be sure to also observe the following further

related subjects:

The Run Flat Indicator ActiveRestart: Press

Touch Control message is shown in the multi‐

function display

Restart the tire pressure loss warning system in

the following situations:

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Notes on tire pressure (/ page 460)

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Display messages about the tires

(/ page 546)

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The tire pressure has changed.

Restarting the tire pressure loss warning

system

Requirements:

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The wheels or tires have been changed or

newly installed.

System limitations

The system may be impaired or may not function

particularly in the following situations:

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The recommended tire pressure is correctly

To begin restart, press Touch Control on the

set for the respective operating status on

left-hand side of the steering wheel.

The Tire Pressure Now OK? message is

shown in the multifunction display

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Incorrectly set tire pressure

each of the four wheels (/ page 460).

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Sudden pressure loss caused, for example,

by a foreign object penetrating the tire

Restart the tire pressure loss warning system in

the following situations:

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Select Yes.

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Steady pressure loss in several tires

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To confirm restart, press Touch Control on

the left-hand side of the steering wheel.

The Run Flat Indicator Restarted message is

shown in the multifunction display.

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The tire pressure has changed.

The wheels or tires have been changed or

newly installed.

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The system has a restricted or delayed function

particularly in the following situations:

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Poor ground conditions, e.g. snow or gravel

On-board computer:

4

Be sure to also observe the following further

related subjects:

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Driving with snow chains

5

Service

Tires

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When adopting a very sporty driving style

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Notes on tire pressure (/ page 460)

Swipe downwards on Touch Control on the

left-hand side of the steering wheel.

with high cornering speeds or sudden accel‐

eration

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Driving with a high load

Wheels and tires -> Tire pressure for Your Mercedes GLC Class SUV First Generation (2015-2021)

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Wheels and tires