2019 MERCEDES-BENZ CLA Engine

Display messagesPossible causes/consequences andPPSolutions
LaneLaneKeepingKeepingAssistAssistCurrently Unavaila‐Currently Unavaila‐ble See Operator'sble See Operator'sManualManual
Lane Keeping Assist is deactivated and temporarily inoperative.
Possible causes are:
Rthe windshield in the camera's field of vision is dirty
Rvisibility is impaired due to heavy rain, snow or fog
Rthere have been no lane markings for an extended period
Rthe lane markings are worn away, dark or covered up, e.g. by dirt orsnow
When the causes stated above no longer apply, the display messagedisappears.
Lane Keeping Assist is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XClean the windshield.
LaneLaneKeepingKeepingAssistAssistInoperativeInoperativeLane Keeping Assist is defective.
XVisit a qualified specialist workshop.
Blind Spot AssistBlind Spot AssistCurrently Unavaila‐Currently Unavaila‐ble See Operator'sble See Operator'sManualManual
Blind Spot Assist is temporarily inoperative.
Possible causes are:
Rthe radar sensor system is temporarily inoperative, e.g. due to elec-tromagnetic radiation emitted by nearby TV or radio stations orother sources of electromagnetic radiation
Rthe radar sensor system is outside the operating temperature range
The yellowcindicator lamps also light up in the exterior mirrors.
When the causes stated above no longer apply, the display messagedisappears.
Blind Spot Assist is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XRestart the engine.
Blind Spot AssistBlind Spot AssistInoperativeInoperativeBlind Spot Assist is malfunctioning.
The yellowcindicator lamps also light up in the exterior mirrors.
XVisit a qualified specialist workshop.
Active ParkingActive ParkingAssist CanceledAssist CanceledThe driver's door is open and the driver's seat belt has not been fas-tened.
XRepeat the parking process with the seat belt fastened and thedriver's door closed.
210Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
You have inadvertently touched the multifunction steering wheel whilesteering intervention was active.
XWhile steering intervention is active, make sure that the multifunc-tion steering wheel is not touched unintentionally.
The vehicle has started to skid and ESP®has intervened.
XUse Active Parking Assist again later (Ypage 165).
Active ParkingActive ParkingAssist InoperativeAssist InoperativeYou have just carried out a large number of turning or parking maneu-vers.
Active Parking Assist will become available again after approximatelyten minutes (Ypage 165).
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSwitch off and restart the engine.
If the multifunction display still shows the display message:
XVisit a qualified specialist workshop.
Parking Assist PARKTRONIC is malfunctioning.
XVisit a qualified specialist workshop.
Active ParkingActive ParkingAssist FinishedAssist FinishedThe vehicle is parked. A warning tone also sounds.
The display message disappears automatically.
Active DistanceActive DistanceAssist OffAssist OffActive Distance Assist DISTRONIC was deactivated (Ypage 156).
If it was not deactivated by the driver, a warning tone also sounds.
Active DistanceActive DistanceAssistAssistNowNowAvailableAvailableActive Distance Assist DISTRONIC is operational again after havingbeen temporarily unavailable. You can now reactivate Active DistanceAssist DISTRONIC (Ypage 154).
Active DistanceActive DistanceAssist CurrentlyAssist CurrentlyUnavailable SeeUnavailable SeeOperator's ManualOperator's Manual
Active Distance Assist DISTRONIC is temporarily inoperative.
Possible causes are:
Rthe radar sensor system is temporarily inoperative, e.g. due to elec-tromagnetic radiation emitted by nearby TV or radio stations orother sources of electromagnetic radiation
Rthe system is outside the operating temperature range
Rthe on-board voltage is too low
A warning tone also sounds.
When the causes stated above no longer apply, the display messagedisappears.
Active Distance Assist DISTRONIC is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XRestart the engine.
Displaymessages211
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
TirePress. Sen‐TirePress. Sen‐sor(s) Missingsor(s) MissingUSA only:
There is no signal from the tire pressure sensor of one or several tires.The pressure of the affected tire does not appear in the multifunctiondisplay.
XHave the faulty tire pressure sensor replaced at a qualified special-ist workshop.
Tire Pressure Moni‐Tire Pressure Moni‐tor Inoperative Notor Inoperative NoWheel SensorsWheel Sensors
USA only:
The wheels mounted do not have a suitable tire pressure sensor. Thetire pressure monitor is deactivated.
XMount wheels with suitable tire pressure sensors.The tire pressure monitor is activated automatically after driving fora few minutes.
TireTirePress.Press.MonitorMonitorInoperativeInoperativeUSA only:
The tire pressure monitor is faulty.
XVisit a qualified specialist workshop.
Vehicle
Display messagesPossible causes/consequences andPPSolutions
Depress Brake toDepress Brake toStart EngineStart EngineYou have attempted to start the engine with the transmission in posi-tion\\without depressing the brake pedal.
XDepress the brake pedal.
ToToDeselectDeselectPPororN,N,Depress Brake andDepress Brake andStart EngineStart Engine
You attempted to shift the transmission to position^or[withoutstarting the engine.
XStart the engine.
XDepress the brake pedal.
iIt is possible to shift the transmission from position]to thedesired position only if you depress the brake pedal. Only then canthe parking lock be deactivated. If you do not depress the brakepedal, the DIRECT SELECT lever can still be moved but the parkinglock remains engaged.
iAt transmission fluid temperatures below

Display messagesPossible causes/consequences andPPSolutions
Stop Vehicle ShiftStop Vehicle Shiftto P Leave Engineto P Leave EngineRunningRunning
The automatic transmission has overheated.
XDrive on carefully.The automatic transmission is available again when the displaymessage goes out.
If the multifunction display still shows the display message:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XWait until the automatic transmission has cooled down and the dis-play message has disappeared.
Auxiliary BatteryAuxiliary BatteryMalfunctionMalfunctionThe auxiliary battery for the automatic transmission is no longer beingcharged.
XVisit a qualified specialist workshop.
XUntil then, always shift the transmission to position]before youswitch off the engine.
XBefore leaving the vehicle, apply the electric parking brake.
Trans. Oil Overhea‐Trans. Oil Overhea‐ted Drive on withted Drive on withCareCare
Mercedes-AMG vehicles: the transmission oil has overheated.
Manual drive programcand the temporarily active manual driveprogram are no longer available. The engine power output is reduced.
XAllow the vehicle to cool down.
4matic Currently4matic CurrentlyUnavailableUnavailable4MATIC has overheated. The vehicle is only driven by the front wheels.
XDrive on.The airflow cools 4MATIC more quickly.
When the display message goes out, 4MATIC is available again andthe vehicle is driven by all four wheels.
4matic Inoperative4matic Inoperative4MATIC is malfunctioning. The vehicle is only driven by the frontwheels.
XVisit a qualified specialist workshop.

Warning and indicator lamps in the instrument cluster
General notes
Some systems carry out a self-diagnosis when the ignition is switched on. Therefore, some indicatorand warning lamps may light up or flash temporarily. This behavior is non-critical.
These indicator and warning lamps only indicate a malfunction if they light up or flash after startingthe engine or whilst driving.
Safety
Seat belts
Warning/indicatorlamp
QQSignal type
Possible causes/consequences andPPSolutions

Safety systems
Warning/indicatorlamp
QQSignal type
Possible causes/consequences andPPSolutions
'MQ'(USA only),M(Canada only): the red brake system warning lamp is litwhile the engine is running. A warning tone also sounds.
GWARNING
The brake boosting effect is malfunctioning and the braking characteristics may beaffected.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to roadand traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 142).
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction display.
'MQ'(USA only),M(Canada only): the red brake system warning lamp is litwhile the engine is running. A warning tone also sounds.
There is not enough brake fluid in the brake fluid reservoir.
GWARNING
The braking effect may be impaired.
There is a risk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to roadand traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 142).
XDo not add brake fluid. Adding more will not correct the malfunction.
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction display.
Warning and indicator lamps in the instrument cluster221
On-board computer and displays
Z

Warning/indicatorlamp
QQSignal type
Possible causes/consequences andPPSolutions
%QThe yellow ABS warning lamp is lit while the engine is running.
ABS (Anti-lock Braking System) is deactivated due to a malfunction. Therefore,
BAS (Brake Assist), Active Brake Assist, ESP®(Electronic Stability Program), theHOLD function and hill start assist, for example, are also deactivated.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listedabove. The wheels could therefore lock if you brake hard, for example.
The steerability and braking characteristics may be severely affected. The brakingdistance in an emergency braking situation can increase.
If ESP®is not operational, ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XObserve the additional display messages in the multifunction display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
If the ABS control unit is defective, there is also a possibility that other systems,such as the navigation system or the automatic transmission, will not be available.
%QThe yellow ABS warning lamp is lit while the engine is running.
ABS is temporarily unavailable. Therefore, BAS, Active Brake Assist, ESP®, EBD(electronic brake force distribution), the HOLD function and hill start assist, forexample, are also deactivated.
Possible causes are:
Rself-diagnosis is not yet complete
Rthe on-board voltage may be insufficient
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listedabove. The front and rear wheels could therefore lock if you brake hard, for exam-ple.
The steerability and braking characteristics may be severely affected. The brakingdistance in an emergency braking situation can increase.
If ESP®is not operational, ESP®is unable to stabilize the vehicle.
There is a risk of an accident.
XCarefully drive a suitable distance, making slight steering movements at a speedabove 12 mph (20 km/h).The functions mentioned above are available again when the warning lamp goesout.
If the warning lamp is still on:
XObserve the additional display messages in the multifunction display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
222Warning and indicator lamps in the instrument cluster
On-board computer and displays

Warning/indicatorlamp
QQSignal type
Possible causes/consequences andPPSolutions
%QThe yellow ABS warning lamp is lit while the engine is running. A warning tonealso sounds.
EBD is malfunctioning. Therefore, ABS, BAS, Active Brake Assist, ESP®, the HOLDfunction and hill start assist, for example, are not available either.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listedabove. The front and rear wheels could therefore lock if you brake hard, for exam-ple.
The steerability and braking characteristics may be severely affected. The brakingdistance in an emergency braking situation can increase.
If ESP®is not operational, ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XObserve the additional display messages in the multifunction display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
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