2006 MERCEDES-BENZ G55AMG check engine

296 Practical hints
What to do if …
ProblemPossible causeSuggested solution
nates briefly after starting the
engine.The warning lamp reminds you to fasten seat
belts.Fasten your seat belt.
The yellow fuel tank reserve warning lamp
illuminates while driving.The fuel level has gone below the reserve
mark.Refuel at the next gas station.
Also note the messages in the multi-
function display (
page 298).
The yellow fuel tank reserve warning lamp is
blinking.The fuel cap is not closed tight.Check the fuel cap.
1The red SRS indicator lamp
comes on while driving.There is a malfunction in the restraint sys-
tems. The airbags or emergency tensioning
device (ETD) 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 immediately to have the
system checked; otherwise the SRS may not
be activated when needed in an accident.This could result in serious or fatal injury, or
it might deploy unexpectedly and unneces-
sarily which could also result in an accident
and/or injury to you or to others.

302 Practical hints
What to do if …
DisplayDisplay messagePossible causePossible solution
ESPESP
NOT AVAILABLEThe charging voltage has fallen below
10 volts and the ESP has switched off.When the voltage is above this value
again, the ESP is operational again.
If necessary, have the generator (alter-
nator) and battery checked.
The ESP is deactivated because of a mal-
function or interrupted power supply. The
ABS and BAS might not be operational.
The system must be resynchronized.Synchronize the ESP. With vehicle sta-
tionary and the engine running, turn
the steering wheel completely to the
left and then to the right to synchro-
nize the ESP.
If the ESP message does not go out:
Continue driving with added caution.
Visit an authorized Mercedes-Benz
Light Truck Center as soon as possi-
ble.
Failure to follow these instructions in-
creases the risk of accident.
!
When synchronizing the ESP, make
sure you can turn the steering wheel in
both directions as far as it will go with-
out the wheels hitting any objects, e.g.
a road curb.

303 Practical hints
What to do if …
DisplayDisplay messagePossible causePossible solution
ESPESP
VISIT WORKSHOP!The ESP is switched off due to a malfunc-
tion or an interruption in the power sup-
ply.
The brake system is still functioning nor-
mally but without ESP, ABS and BAS avail-
able.
If in addition the ABS is malfunctioning,
only partial engine output will be avail-
able.Continue driving with added caution.
Have the system checked at an autho-
rized Mercedes-Benz Light Truck
Center as soon as possible.
Failure to follow these instructions in-
creases the risk of accident.

304 Practical hints
What to do if …
Symbol messages
Display symbolDisplay messagePossible causePossible solution
#BATTERY/ALTERNATOR
VISIT WORKSHOP!The battery was charged with a battery
charger or jump started.Have the battery checked at a service
station.
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. Otherwise
the engine will overheat due to an in-
operative water pump which may re-
sult in serious engine damage not
covered by the Mercedes-Benz Limited
Warranty. Notify an authorized
Mercedes-Benz Light Truck Center.
If it is intact:
Turn off unnecessary electric consum-
ers.
Drive immediately to the nearest
authorized Mercedes-Benz Light Truck
Center.
UNDERVOLTAGE
ENGINE ON!The battery has insufficient voltage.Start the engine.

305 Practical hints
What to do if …
Display symbolDisplay messagePossible causePossible solution
#UNDERVOLTAGE
SWITCH CONSUMERS OFF!The battery has insufficient voltage.Have the battery checked at a ser-
vice station.
2BRAKE WEAR
VISIT WORKSHOP!The brake pads have reached their
wear limit.Have the brake pads replaced as
soon as possible.
3 BRAKE FLUID
VISIT WORKSHOP!There is insufficient brake fluid in the
reservoir.Risk of accident! Stop the vehicle
and notify an authorized
Mercedes-Benz Light Truck Center.
Do not add brake fluid! This will not
solve the problem.
Warning!G
Driving with the message BRAKE FLUID
VISIT WORKSHOP
displayed can result in an
accident. Have your brake system checked
immediately.
Do not add brake fluid before checking the
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot
engine parts and the brake fluid catching
fire. You can be seriously burned.
!
If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks.
!
Brake pad thickness must be visually
checked by a qualified technician at the
intervals specified in the Maintenance
Booklet.

307 Practical hints
What to do if …
Display symbolDisplay messagePossible causePossible solution
B COOLANT
CHECK LEVEL!The coolant level is too low.Add coolant (page 248).
If you have to add coolant frequently,
have the cooling system checked by
an authorized Mercedes-Benz Light
Truck Center.
Warning!G
Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. You could be seriously burned.
!
Do not ignore the low engine coolant
level warning. Extended driving with
the message and symbol displayed
may cause serious engine damage not
covered by the Mercedes-Benz Limited
Warranty.
Do not drive without sufficient amount
of coolant in the cooling system. The
engine will overheat causing serious
engine damage.
Observe the coolant temperature dis-
play (
page 120).

309 Practical hints
What to do if …
Display symbolDisplay messagePossible causePossible solution
ÏCOOLANT
STOP, ENGINE OFF!The poly-V-belt could be broken. Stop the vehicle and immediately turn
off the engine.
Check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise
the engine will overheat due to an
inoperative water pump which may re-
sult in damage to the engine. Notify an
authorized Mercedes-Benz Light Truck
Center.
If it is in order:
Do not continue to drive the vehicle
with this message displayed. Doing so
could result in serious engine damage
that is not covered by the
Mercedes-Benz Limited Warranty.
Observe the coolant temperature
display (
page 120).
Drive immediately to the nearest au-
thorized Mercedes-Benz Light Truck
Center.

311 Practical hints
What to do if …
When the ADD 1.0 QT. ENG. OIL - WHEN
NEXT REFUELLING!
(Canada: 1.0 LITER)
message appears while the engine is run-
ning and at operating temperature, the en-
gine oil level has dropped to approximately
the minimum level.When this occurs, the warning will first
come on intermittently and then stay on if
the oil level drops further.
Visually check for oil leaks. If no obvious oil
leaks are noted, drive to the nearest ser-
vice station where the engine oil should be
topped to the required level with an ap-
proved oil specified in the Factory
Approved Service Products pamphlet.
Display symbolDisplay messagePossible causePossible solution
: USA only:
ADD 1.0 Qt. ENGINE OIL
WHEN NEXT REFUELING!
Canada only:
ADD 1.0 LITER ENG. OIL
WHEN NEXT REFUELING!
The engine oil level is too low.Add engine oil (page 247) and check
the engine oil level (
page 244).
!
The engine oil level warnings should
not be ignored. Extended driving with
the symbol displayed could result in
serious engine damage that is not
covered by the Mercedes-Benz Limited
Warranty.