Page 1052 of 4133
248 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
?
The yellow “CHECK ENGINE”
malfunction indicator lamp
comes on while driving.
There is a malfunction of:
The fuel management system
The ignition system
The emission control system
Systems which affect emissions
Such malfunctions may result in excessive
emissions values and may switch the engine
to its limp-home (emergency operation)
mode.
Have the vehicle checked as soon as
possible by an authorized
Mercedes-Benz Light Truck Center.
An on-board diagnostic connector is
used by the service station to link the
vehicle to the shop diagnostics sys-
tem. It allows the accurate identifica-
tion of system malfunctions through
the readout of diagnostic trouble
codes. It is located in the front left
area of the footwell next to the park-
ing brake pedal.
The fuel cap is not closed tightly.
Check the fuel cap (
page 214).
Your fuel tank is empty.
After refuelling start the engine three
or four times in succession.
The limp-home mode is canceled. You do
not need to have your vehicle checked.
Page 1053 of 4133
249 Practical hints
What to do if …
Problem
Possible cause
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/
The yellow coolant warning lamp
comes on when the engine is
running.
The coolant is to hot.
The coolant level is too low.
Stop as soon as possible and allow
the engine and coolant to cool down.
Check the coolant level and add
coolant if necessary (
page 222).
If the warning lamp comes on frequently,
there is a leak in the cooling system.
Have the cooling system checked by
an authorized Mercedes-Benz Light
Truck Center.
The coolant temperature gauge is above
248 °F (120 °C).
The coolant level is too low.
Stop as soon as possible and allow
the engine and coolant to cool down.
Add coolant to prevent engine from
overheating (
page 222).
If the coolant level is correct, the electrical
radiator fan may be broken.
If the coolant temperature is below
the red zone, drive on to the nearest
authorized Mercedes-Benz Light
Truck Center.
Avoid high engine loads (e.g. driving
uphill) and stop-and-go driving.
Page 1055 of 4133
251 Practical hints
What to do if …
Problem
Possible cause
Suggested solution
v
The yellow 4-ETS / ESP warning
lamp comes on steady while
driving.
The ESP is deactivated.
Risk of accident!
Adapt your speed and driving to the prevail-
ing road and weather conditions.
Switch the ESP back on (
page 82).
If the ESP cannot be switched back on,
have the system checked at an autho-
rized Mercedes-Benz Light Truck Center
as soon as possible.
v
The yellow 4-ETS / ESP warning
lamp flashes while driving.
The ESP or 4-ETS has come into operation
because of detected traction loss in at least
one tire.
During take-off, apply as little throttle
as possible.
While driving, ease up on the accele-
rator.
Adapt your speed and driving to the
prevailing road and weather condi-
tions.
Do not deactivate the ESP.
Exceptions: (
page 81).
Failure to follow these instructions in-
creases the risk of accidents.
Page 1056 of 4133
252 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
{
The yellow ETS malfunction indi-
cator lamp comes on while driv-
ing.
4-ETS has switched off to prevent overheat-
ing of the brakes. Also see 4-ETS / ESP warn-
ing lamp (
page 251).
As soon as the brakes have cooled off,
4-ETS switches on again.
The indicator lamp goes out.
4-ETS is malfunctioning and has switched off.
Have the 4-ETS checked at an autho-
rized Mercedes-Benz Light Truck Cen-
ter as soon as possible.
ê
The yellow LOW RANGE indicator
lamp flashes after one or more
switching conditions.
The gear selection conditions have not been
adhered to.
Repeat the gear selection process
(page 125).
ê
The yellow LOW RANGE indicator
lamp flashes after switching the
ignition on.
LOW RANGE mode is malfunctioning.
Have the LOW RANGE mode checked at
an authorized Mercedes-Benz Light Truck
Center.
The yellow fuel tank reserve
warning lamp comes on while
driving.
The fuel level has gone below the reserve
mark.
Refuel at the next gas station
(page 214).
The yellow fuel tank reserve
warning lamp flashes when leav-
ing the engine running.
The fuel cap is not closed tightly.
Check the fuel cap (
page 214).
Page 1057 of 4133
253 Practical hints
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:
The yellow warning lamp flashes
after starting the engine or while
driving.
The engine oil level has sunk to the minimum
level. If the engine oil level continues to sink,
the warning lamp will light up.
Add approved oil at the next gas
station (
page 302).
If oil loss is visible on the engine, have
the malfunction corrected as soon as
possible at a Mercedes-Benz Light
Truck Center.
_
The red indicator lamp does not
go out after starting the engine.
The adjustable telescoping steering column
is not properly locked.
Lock the adjustable steering column
(page 39).
‡
The green front fog lamp indica-
tor lamp lights up when ignition
is turned on.
The front fog lamps are switched on.
Fog lamps (
page 111).
<
The red seat belt warning lamp
illuminates for a brief period
after starting the engine.
The warning lamp reminds you to fasten seat
belts.
Fasten your seat belt (
page 64).
W
The yellow low washer system
fluid level lamp comes on after
starting the engine or while driv-
ing.
There is approximately 1.3 US qt. (1.25 l) of
washer fluid remaining in the reservoir.
Add washer fluid (
page 224).
The washer fluid may have frozen.
Move the vehicle to a warmer environ-
ment so that the washer fluid will
thaw.
Correct the concentration level after
the washer fluid in the reservoir
thaws.
Page 1058 of 4133
254 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
#
The red charge indicator lamp
comes on when the engine is
running.
The battery is no longer charging.
Possible causes:
alternator malfunctioning
broken poly-V-belt
Stop immediately and check the
poly-V-belt.
If it is broken
Do not continue to drive, before the
poly-V-belt is replaced.
Notify an authorized Mercedes-Benz
Light Truck Center.
2
The yellow brake indicator lamp
comes on during braking or after
starting the engine.
The brake pads are worn down.
Have the system checked at an autho-
rized Mercedes-Benz Light Truck
Center.
!Brake pad thickness must be visually
checked by a qualified technician at the
intervals specified in the Service book-
let.
Page 1059 of 4133
255 Practical hints
What to do if …
Problem
Possible cause
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1
The red SRS indicator lamp lights
up while driving.
There is a malfunction in the restraint sys-
tems. The airbags or emergency tensioning
device (ETDs) could deploy unexpectedly or
fail to activate in an accident.
Drive with added caution to the near-
est authorized Mercedes-Benz Light
Truck Center.
Warning!
G
In the event a malfunction of the SRS is indi-
cated as outlined above, the SRS may not be
operational. For your safety, we strongly
recommend that you visit an authorized
Mercedes-Benz Light Truck Center immedi-
ately to have the system checked, otherwise
the SRS may not be activated when needed
in an accident, which could result in serious
or fatal injury, or it might deploy unexpect-
edly and unnecessarily which could result in
an accident / or injury to you or to others.
Page 1060 of 4133
256 Practical hintsWhat to do if …Additional indicators in the speedome-ter displayDisplay
Possible cause
Suggested solution
9
Perform minor service (A) (
page 232).
Visit an authorized Mercedes-Benz
Light Truck Center to perform service.
´
Perform major service (B) (
page 232).
Visit an authorized Mercedes-Benz
Light Truck Center to perform service.
Á
î
The
StArt
message comes on in
addition to the
Error
message.
The immobilizer is not operational.
Contact an authorized
Mercedes-Benz Light Truck Center or
call 1-800-FOR-MERCedes (in the
USA), or 1-800-387-0100 (in Cana-
da).
