2013 MERCEDES-BENZ G-Class Owner's Manual

Display messages Possible causes/consequences and
M SolutionsFront Passenger
Airbag Disabled
See Operator's
Manual A special BabySmart™-compatible child restraint system is
mounted on the front-passenger seat.
The 45 indicator lamp also lights up.
The front-passenger air bag is therefore disabled.
Further information on BabySmart™
(Y page 44).Front Passenger
Airbag

Enabled See
Operator's Manual The 45 indicator lamp does not remain lit if a special
BabySmart™-compatible
child restraint system has been installed
on the front-passenger seat.
The BabySmart™ system is malfunctioning.
G WARNING
The front-passenger front air bag can be triggered unintentionally
in the event of an accident.
There is a risk of an accident.
X Make sure there is nothing between the seat and the child
restraint system.
X Check that the child restraint system is installed correctly.
X If the 45 indicator lamp does not light up, have the
BabySmart™
system checked as soon as possible at a qualified
specialist workshop.
Do not transport a child on the front-passenger seat until the
air bag deactivation system has been repaired. Lights
i Display messages about LEDs:
This display message will only appear if all LEDs have failed. Display messages Possible causes/consequences and
M Solutionsb
Check Left Low
Beam or Check
Right Low Beam The left or right-hand low-beam headlamp is defective.
X
Visit a qualified specialist workshop. b
Check

Trailer Left
Tail Lamp  or Check
Trailer Right Tail
Lamp The left or right-hand trailer tail lamp is faulty.
X
Check whether you are permitted to change the bulb yourself.
or
X Visit a qualified specialist workshop. Display messages
231
On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutionsb
Check
Trailer Left
Turn Signal or 
Check Trailer
Right Turn Signal The left or right-hand trailer turn signal lamp is defective.
X
Check whether you are permitted to change the bulb yourself.
or
X Visit a qualified specialist workshop. b
Check Trailer
Brake Lamp The trailer brake lamp is defective.
X
Check whether you are permitted to change the bulb yourself.
or
X Visit a qualified specialist workshop. b
Check Rear Left
Turn Signal or 
Check Rear Right
Turn Signal The rear left-hand or rear right-hand turn signal is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 109).
or
X Visit a qualified specialist workshop. b
Check Front Left
Turn Signal or 
Check Front Right
Turn Signal The front left-hand or front right-hand turn signal is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 109).
or
X Visit a qualified specialist workshop. b
Check Left Mirror
Turn Signal or 
Check

Right Mirror
Turn Signal The turn signal in the left-hand or right-hand exterior mirror is
defective.
X
Visit a qualified specialist workshop. b
Check

Center Brake
Lamp The high-mounted brake lamp is faulty.
X
Visit a qualified specialist workshop. b
Check Left Brake
LamporCheck Right
Brake Lamp The left or right-hand brake lamp is defective.
X
Replace the bulb ( Y page 108).b
Check Left High
BeamorCheck Right
High Beam The left or right-hand high beam is defective.
X
Visit a qualified specialist workshop.232
Display messages
On-board computer and displays

Display messages Possible causes/consequences and
M Solutionsb
License Plate Lamp There is a short circuit in the LED lamps. The LEDs have been
switched off.
X
Visit a qualified specialist workshop. b
Check Left Fog
LamporCheck Right
Fog Lamp The left-hand or right-hand front fog lamp is defective.
X
Replace the bulb ( Y page 108).b
Rear Fog Lamp The rear fog lamp is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 109).
or
X Visit a qualified specialist workshop. b
Check Front Left
Parking Lamp or 
Check Front Right
Parking Lamp The front left or front right parking or standing lamp is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 109).
or
X Visit a qualified specialist workshop. b
Backup Light The backup lamp is defective.
X
Replace the bulb ( Y page 108).b
Check Front Left
Sidemarker
LamporCheck Front
Right Sidemarker
Lamp The left or right front side marker lamp is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 109).
or
X Visit a qualified specialist workshop. b
Check Left Tail
LamporCheck Right
Tail Lamp The left or right-hand tail lamp is defective.
X
Check whether you are permitted to replace the bulb yourself
(Y page 109).
or
X Visit a qualified specialist workshop. Display messages
233On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutionsb
Check
Left Daytime
Running Light or 
Check Right
Daytime Running
Light The left or right-hand daytime running lamp is defective.
X
Visit a qualified specialist workshop. b
Malfunction See
Operator's Manual The exterior lighting is defective.
X
Visit a qualified specialist workshop. b
Auto

Lamp Function
Inoperative The light sensor is defective.
X
Visit a qualified specialist workshop. b
Switch Off Lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to Ã.Engine
Display messages Possible causes/consequences and
M Solutions+
Check Coolant
Level See
Operator's Manual The coolant level is too low.
X
Add coolant, observing the warning notes before doing so
(Y page 291).
X Have the coolant system checked at a qualified specialist
workshop

if the coolant needs topping up more often than usual.? The fan motor is faulty.
X
At coolant temperatures below 248 ‡
(120 †), drive to the next
qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in
mountainous terrain and stop-start traffic.234
Display messages
On-board computer and displays

Display messages Possible causes/consequences and
M Solutions?
Coolant Too Hot
Stop Vehicle Turn
Engine Off The coolant is too hot.
A warning tone also sounds.
G WARNING
Do not drive when your engine is overheated. This can cause some
fluids which may have leaked into the engine compartment to
catch fire.
Steam from the overheated engine can also cause serious burns
which can occur just by opening the hood.
There is a risk of injury.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away ( Y page 156).
X Leave the vehicle and keep a safe distance from the vehicle until
the engine has cooled down.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by snow, slush or ice.
X Do not start the engine again until the display message goes out
and the coolant temperature is below
248 ‡ (120 †).
Otherwise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to
248 ‡ (120 †).The poly-V-belt may have torn.
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Check the poly-V-belt.
If the poly-V-belt is torn:
! Do

not continue driving. The engine could otherwise overheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is not damaged:
X Wait until the display message disappears before restarting the
engine. Otherwise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X Visit a qualified specialist workshop. Display messages
235
On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions# The battery is not being charged.
A warning tone also sounds.
Possible causes are:
R
a defective alternator
R a torn poly-V-belt
R a malfunction in the electronics
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Open the hood.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do
not continue driving. The engine could otherwise overheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is not damaged:
X Visit a qualified specialist workshop. 4
Check Engine Oil
At Next Refueling The engine oil level has dropped to the minimum level.
A warning tone also sounds.
X
Check the oil level when next refueling, at the latest
(Y page 289).
X If necessary, add engine oil ( Y page 291).
X Have the engine checked at a qualified specialist workshop if
engine oil needs to be added more often than usual.
! Avoid long journeys with too little engine oil. The engine will
otherwise be damaged.
Information on approved engine oils can be obtained from any
qualified specialist workshop or on the Internet at http://
www.mbusa.com (USA only). 4
Engine Oil Level
Low Stop Vehicle
Turn Engine Off The engine oil level is too low. There is a risk of engine damage.
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Add engine oil ( Y page 291) and check the oil level
(Y page 289). 236
Display messages
On-board computer and displays

Display messages Possible causes/consequences and
M Solutions4
Check Engine Oil
Level
(Add 1 quart) AMG vehicles: the engine oil level is too low.
X
Check the oil level when next refueling, at the latest
(Y page 289).
X If necessary, add engine oil ( Y page 291).
X Have the engine checked at a qualified specialist workshop if
engine oil needs to be added more often than usual.
! Avoid long journeys with too little engine oil. The engine will
otherwise be damaged.
Information on approved engine oils can be obtained from any
qualified specialist workshop or on the Internet at http://
www.mbusa.com (USA only). 4
Engine Oil Level
Cannot Be Measured The measuring system is malfunctioning.
X
Visit a qualified specialist workshop. 8
Fuel Level Low The fuel level has dropped into the reserve range.
X
Refuel at the nearest gas station. C There is only a very small amount of fuel in the fuel tank.
X
Refuel at the nearest gas station without fail. 8
Gas Cap Loose The fuel system pressure is too low. The fuel filler cap is not closed
correctly or the fuel system is leaking.
X
Check that the fuel filler cap is correctly closed.
If the fuel filler cap is not correctly closed:
X Close the fuel filler cap.
If the fuel filler cap is correctly closed:
X Visit a qualified specialist workshop. Display messages
237
On-board computer and displays Z

Driving systems
Display messages Possible causes/consequences and
M SolutionsTC Shift
Conditions Not
Fulfilled
Apply Brake/
Parking Brake The parking brake has not been applied and the brake pedal has
not been depressed. The transfer case has canceled the gear
change
process and is in Neutral. There is no connection between
the engine and the drive wheels.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Depress the brake pedal and apply the parking brake.
X Shift the automatic transmission to neutral position N.
X Make sure all conditions for changing gears are met
(Y page 199).
X Repeat the gearshift process. TC Malfunction
Visit WorkshopTo
park, apply the
parking brake There is a malfunction in the transfer case.
X
Do not shift the transfer case.
X When parking, secure the vehicle against rolling away
(Y page 156).
X Have the vehicle checked at a qualified specialist workshop. TC Shift Canceled
Please Reactivate The transfer case has not performed the gear change process.
X
Repeat the gearshift process.
X Make sure all conditions for changing gears are met
(Y page 199). TC Shift Condition
Not Fulfilled
Drive at Max.
25 mph You have exceeded the maximum speed for the gearshift process.
X
Drive more slowly.
X Repeat the gearshift process. TC Shift Condition
Not Fulfilled
Shift to NEUTRAL You have not met one or more shift conditions.
X
Shift the automatic transmission to neutral position N.
X Repeat the gearshift process. TC shift condition
not fulfilled
Drive at Max.
40 mph You have exceeded the maximum speed for the gearshift process.
X
Drive more slowly.
X Repeat the gearshift process. LOW RANGE
On The transfer case is in the LOW RANGE off-road position.
HIGH RANGE
On The transfer case is in the HIGH RANGE on-road position.238
Display messages
On-board computer and displays