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Risk of accident
$
If the STOP lamp does not go out or if it lights up while driving, the operational safety of the vehicle is at risk.
• Stop the vehicle as soon as possible taking into account the traffic situation.
• Apply the parking brake and switch off the engine.
• Have the affected system checked and repaired as quickly as possible at a qualified specialist workshop possessing the required expertise and tools in order to perform the necessary work
Mercedes-Benz recommends a Mercedes-Benz service center for this work. It is absolutely essential that all safety-relevant work and all work on safety-relevant systems is performed by a qualified specialist workshop.
Description and roadside assistance
System abbreviations
Risk of accident
$
If an electronic system fails, this is displayed by the abbreviations below. The handling and braking behavior of the vehicle may change!
Have the affected system checked and repaired as quickly as possible at a qualified specialist workshop possessing the required expertise and tools in order to perform the necessary work.
Mercedes-Benz recommends a Mercedes-Benz service center for this work. It is absolutely essential that all safety-relevant work and all work on safety-relevant systems is performed by a qualified specialist workshop.
Abbreviation Description Action
ABS Antilock brake system:
The wheels may lock up when braking. The lateral stability of the vehicle may change.
M Drive with special care or tow the vehicle away, see page 169.
AG Automatic gear selection M Fold out the clutch pedal and shift
gears manually, see page 123.
M Drive with special care.
ART Autonomous intelligent cruise control:
Inoperative
M Drive with special care.
BS Brake control:
The braking behavior of the vehicle has changed significantly. ABS is deactivated.
The wheels may lock up when braking. The lateral stability of the vehicle may change. Brake pedal travel longer, brake pedal forces increased.
M Drive with special care or tow the vehicle away, see page 169.
EAB Electronic trailer/semitrailer brake:
The braking behavior of the vehicle may change.
The wheels may lock up when braking. The lateral stability of the vehicle may change. Brake pedal travel longer.
M Drive with special care or tow the vehicle away, see page 169.
EDW Anti-theft alarm system M Have the system repaired.
FFB Radio remote control M Lock/unlock the doors with the
ve-hicle key.
Description and roadside assistance
FR Drive control Activate engine limp-home mode:
M Apply parking brake and switch off engine.
M After 10 seconds, start engine.
In limp-home mode the engine speed is limited to 1250 rpm.
M If the engine speed is not sufficient to start off or drive, tow the vehicle away, see page 169.
GS Transmission control M If a gearchange is no longer
possi-ble, perform an emergency shift, see page 126.
HPS Manual gearshift system (HPS) M Perform emergency shift,
see page 120.
HZR Heater control M Have the system repaired.
INS Instrument cluster:
Important information (warnings, malfunctions) can no longer be displayed.
M Drive with special care.
or
M Tow the vehicle away, see page 169.
KOM Communications interface M Have the system repaired.
KS Clutch control
Vehicles with Telligent® automatic gearshift system
M Drive with special care.
M Fold out the clutch pedal and shift gears manually, see page 123.
KSA Comfort locking system M Have the system repaired.
MR Engine control:
Accelerator pedal inoperative and constant engine speed below 1300 rpm.
Activate engine limp-home mode:
M Apply parking brake and switch off engine.
M After 10 seconds, start engine.
In limp-home mode the engine speed is limited to 1250 rpm.
M If the engine speed is not sufficient to start off or drive, tow the vehicle away, see page 169.
NR Level control:
The handling of the vehicle may change (e.g. chassis leans to one side, center of gravity changed).
M Drive with special care.
PSM Parameterizable special module: M Have the system repaired.
Abbreviation Description Action
Description and roadside assistance
SIL Seat electronics, left M Have the system repaired.
SIR Seat electronics, right M Have the system repaired.
SPA Lane Assistant M Have the system repaired.
SRS Supplemental restraint system M Have the system repaired.
TCO Tachograph M Have the system repaired.
WS Maintenance system M Have the system repaired.
WSK Torque converter clutch:
The handling of the vehicle may change.
M Tow the vehicle away, see page 169.
ZHE Auxiliary heater M Have the system repaired.
ZV Central locking M Lock/unlock the doors with the
vehicle key.
Abbreviation Description Action
Description and roadside assistance
Display messages
Display message with yellow status indicator
Display message Possible cause/consequence Possible remedy
Risk of accident
$
The poly-V belt has snapped or the three-phase alternator is defective.
The voltage in the on-board electrical system has dropped below 22 V.
The handling and braking behavior of the vehicle may change.
M Stop the vehicle as soon as possible taking into account the traffic situation.
M Switch off engine and apply parking brake.
M Check poly-V belt.
M If the poly-V belt is OK, have the electrical system checked at a qualified workshop.
M If the poly-V belt has snapped, notify a qualified workshop and have the poly-V belt re-placed.
Risk of accident
$
The alternator is defective.
The handling and braking behavior of the vehicle may change.
M Stop the vehicle as soon as possible taking into account the traffic situation.
M Switch off engine and apply parking brake.
M Have the electrical system checked at a qualified work-shop.
• No monitoring of the trailer/
semitrailer.
• When switching on the lights: Bulb or fuse for standing lamps, low beam lamps, taillamps, license plate illumi-nation or rear fog lamp is defective.
• When braking: Brake lamp is defective.
• When signaling: Turn signal lamp is defective.
• After the instrument panel function check: Fuse for brake lamps is defective.
M Check and replace the appro-priate fuse.
M Check and replace the appro-priate bulb.
The oil level of the automatic engine oil refill system has dropped to about 3.5 l.
M Top up.
Description and roadside assistance
Engine oil level has dropped to minimum fill level.
M Top up.
Coolant level has dropped about 2 l below the normal fill level.
M Top up.
Coolant temperature is too high. The engine output is automatically reduced.
M Demand less power from the engine.
M Make sure that the air supply to the radiator is not obstruct-ed.
Fuel level has dropped to about 14% of maximum fill level.
M Refuel.
The fluid level in the reservoir of the windshield washer/headlamp cleaning system has dropped to about 1 l.
M Top up.
Risk of accident
$
The reservoir pressure for ancillary consumers has dropped below 5.5 bar.
The clutch can no longer be fully
disengaged and reliable gearchanges are no longer possible.
M Top up the compressed air sys-tem, fill from an external source, see page 144, or tow the vehicle away,
see page 169.
Risk of accident
$
Fault in brake system of tractor unit or trailer/semitrailer.
The handling and braking behavior of the vehicle may change.
M Drive with special care or tow the vehicle away,
see page 169.
Display message with yellow status indicator
Display message Possible cause/consequence Possible remedy
Description and roadside assistance
Risk of accident
$
Fault in Telligent® automatic gearshift system. The warning buzzer sounds.
M Fold out the clutch pedal and shift gears manually,
see page 123.
M Drive with special care.
You cannot start the engine.
Immobilizer is activated.
M Wait until the warning buzzer stops.
M Turn the vehicle key in the igni-tion lock all the way back.
M Repeat the start attempt after about 2 seconds.
Display message with yellow status indicator
Display message Possible cause/consequence Possible remedy
Display message with red status indicator
Display message Possible cause/consequence Possible remedy
Risk of accident
$
The poly-V belt has snapped or the three-phase alternator is defective.
The voltage in the on-board electrical system has dropped below 22 V.
The handling and braking behavior of the vehicle may change.
M Stop the vehicle as soon as possible taking into account the traffic situation.
M Switch off engine and apply parking brake.
M Check poly-V belt.
M If the poly-V belt is OK, have the electrical system checked at a qualified workshop.
M If the poly-V belt has snapped, notify a qualified workshop and have the poly-V belt re-placed.
The engine oil pressure is too low. The warning buzzer sounds. The STOP lamp lights up.
The operational safety of the engine is at risk.
M Stop the vehicle as soon as possible taking into account the traffic situation.
M Switch off engine and apply parking brake.
M Check engine oil level, see page 90, and top up.
Description and roadside assistance
Engine oil level has dropped about 2 l below minimum fill level. The warning buzzer sounds.
The STOP lamp lights up.
M Check engine oil level, see page 90, and top up.
Risk of accident
$
The oil level in the reservoir of the power steering system has dropped to the minimum fill level.
If more oil is lost, there is a risk of accident because the vehicle will be difficult to steer.
The STOP lamp lights up.
M Top up steering oil and drive with special care.
Four-axle vehicles: Steering circuit 2 has failed.
The vehicle can only be steered with increased effort.
M Adjust your driving style. Re-duce speed before corners in particular.
M Have the steering system checked at a qualified work-shop.
Coolant level has dropped about 4 l below the normal fill level. The warning buzzer sounds.
M Stop the vehicle as soon as possible taking into account the traffic situation.
M Switch off engine and apply parking brake.
M Top up coolant.
M Have the cooling system checked for leaks at a qualified workshop.
Risk of accident
$
Reservoir pressure
• in brake circuit 1 or 2 has dropped below 6.8 bar
• in the spring-loaded brake and trailer brake circuit is too low
or
M Top up the compressed air sys-tem or fill from an external source, see page 144.
or
M Tow the vehicle away, see page 169.
Display message with red status indicator
Display message Possible cause/consequence Possible remedy
Description and roadside assistance
Risk of accident
$
The service limit of the brake linings has been reached.
The braking behavior of the vehicle may change significantly.
M Drive with special care.
M Have the brake linings re-placed at a qualified workshop as quickly as possible.
Risk of accident
$
Malfunction in brake system of trailer/
semitrailer.
The handling or braking properties of the vehicle may change.
M Drive with special care.
M Have the brake system checked at a qualified work-shop.
Risk of accident
$
Brake pressure limiting.
The applied brake pressures no longer correspond to the load state.
The braking behavior of the vehicle is changed.
M Drive with special care.
M Have the brake system checked at a qualified work-shop.
The retarder cannot be deactivated during ABS control or when depressing the accelerator pedal.
M Drive with special care.
Vehicles with Telligent® automatic gearshift system:
Clutch overloaded: The permissible operating temperature of the clutch system has been exceeded. If the moving-off or maneuvering process is not ended within 5 seconds when the warning buzzer sounds, the clutch may overheat.
M Leave the clutch to cool and select a lower moving-off gear if necessary.
Display message with red status indicator
Display message Possible cause/consequence Possible remedy
Description and roadside assistance
Risk of accident
$
Display failure. Important operating information and warnings can no longer be displayed.
The handling and braking behavior of the vehicle may change.
M Drive with special care.
M Tow the vehicle away, see page 169.
The service date has been significantly exceeded.
M Perform service.
M Have the service work per-formed at a qualified work-shop.
Display message with red status indicator
Display message Possible cause/consequence Possible remedy
Description and roadside assistance
Indicator lamps
Indicator lamp Description Dumper body
Acceleration skid control "ASR" and Telligent® stability control "SR"
Applicable for vehicle with Telligent® automatic gearshift system:
Speed too high for automatic downshift – brake!
Torque converter clutch
Flame starting system (cold-starting aid)
Cargo liftgate
Frequent-stop brake
Stationary air conditioner
Parking brake applied.
Permanent brake
Steering lock of hydraulically steered trailing axle.
Cab lock
Lane Assistant