check engine CITROEN C5 2021 Owners Manual
Page 5 of 228
3
Contents
Highway Driver Assist 2.0  111
Adaptive cruise control  11 2
Lane positioning assist  11 6
Speed adjustment during cornering  11 9
Semi-automatic lane changing  120
Active Safety Brake with Collision Risk Alert and 
Intelligent emergency braking assistance 
 124
Distraction detection  128
Active lane departure warning system  129
Long-distance blind spot monitoring  131
Parking sensors  132
Top Rear Vision  134
Top 360 Vision  135
Rear traffic alert  137
 7Practical informationCompatibility of fuels  140
Refuelling  140
Rechargeable hybrid system  141
Charging the traction battery (Rechargeable  
hybrid engine) 
 148
Towing device  150
Towing device with quickly detachable towball  151
Roof bars  154
Very cold climate screen  155
Snow chains  155
Energy economy mode  156
Bonnet  156
Engine compartment  158
Checking levels  158
Checks  159
Free-wheeling  161
Advice on care and maintenance  162
 8In the event of a breakdownWarning triangle  165
Tool kit  165
Temporary puncture repair kit  166
Spare wheel  169
Changing a bulb  171
Fuses  173
12
 
V battery
 
/ Accessory batteries  173
Towing the vehicle  178
 9Technical dataEngine technical data and towed loads  181
Petrol engines  182
Rechargeable hybrid engine  183
Dimensions  184
Identification markings  184
 10 MYCITROËN DRIVE PLUS - MYCITROËN PLAY PLUS
First steps  185
Customisation  188
Steering mounted controls  189
Applications  190
Voice commands  190
Navigation  191
Connectivity  192
Mirror Screen  194
Media  195
Phone  197
Settings  198
Help  199
 11Event data recorders
  â– 
Alphabetical index
  â– 
Appendix   
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8
Eco-driving
Eco-driving
Eco-driving refers to a range of everyday 
practices that allow the motorist to optimise 
the vehicle's energy consumption (fuel and/or 
electricity) and CO
2 emissions.
Optimise your use of the gearbox
With an automatic gearbox, favour automatic 
mode. Do not depress the accelerator pedal 
heavily or suddenly.
The gear shift indicator prompts you to engage 
the most suitable gear. Whenever this indication 
is displayed on the instrument panel, follow it 
straight away.
With an automatic gearbox, this indicator 
appears only in manual mode.
Drive smoothly
Maintain a safe distance between vehicles, use 
engine braking rather than the brake pedal and 
press the accelerator gradually. These practices 
help to save on energy consumption, reduce 
CO
2 emissions and decrease general traffic 
noise.
When the traffic is flowing smoothly, select the 
cruise control.
Control the use of electrical equipment
Before moving off, if the passenger compartment 
is too warm, ventilate it by opening the windows 
and air vents before using the air conditioning.
At speeds above 31
  mph (50   km/h), close the 
windows and leave the air vents open. Consider using equipment that can help keep 
the temperature in the passenger compartment 
down (e.g.
  sunroof blind, window blinds).
Unless automatically regulated, switch off the air 
conditioning as soon as the desired temperature 
has been reached.
Switch off the demisting and defrosting functions, 
if they are not managed automatically.
Switch off the heated seat as soon as possible.
Adapt the use of headlamps and/or foglamps 
depending on visibility conditions.
Avoid running the engine before moving off, 
particularly in winter (other than in severe wintry 
conditions: temperature below -23°C). The 
vehicle will warm up much faster while driving.
As a passenger, avoid connecting your 
multimedia devices (e.g.   film, music, video 
game) to help reduce the consumption of energy.
Disconnect all portable devices before leaving 
the vehicle.
Limit the causes of excess consumption
Spread loads throughout the vehicle. Place the 
heaviest items in the boot as close as possible to 
the rear seats.
Limit the loads carried in the vehicle and 
minimise wind resistance (e.g.
  roof bars, roof 
rack, bicycle carrier, trailer). Preferably, use a 
roof box.
Remove roof bars and roof racks after use.
At the end of winter, remove snow tyres and refit 
summer tyres.
Comply with the servicing instructions
Check tyre pressures regularly, with the tyres 
cold, referring to the label in the door aperture on 
the driver's side.
Carry out this check in particular:
–
 
before a long journey
 .
–
 
at each change of season.
–
 
after a long period out of use.
Do not forget the spare wheel and, where 
applicable, the tyres on your trailer or caravan.
Have your vehicle serviced regularly (e.g.
  engine 
oil, oil filter, air filter, passenger compartment 
filter, etc.). Observe the schedule of operations in 
the manufacturer's service schedule.
When filling the fuel tank, do not continue after 
the third cut-out of the nozzle, to avoid overflow.
You will only see the fuel consumption of your 
new vehicle settle down to a consistent average 
after the first 1,900 miles (3,000 kilometres).
Optimising the driving range 
(rechargeable hybrid vehicles)
Connect the vehicle as soon as possible.
Favour the ECO zone of the power indicator by 
driving smoothly and at a steady speed.
Anticipate slowing down as much as possible 
and, if possible, favour decelerations with 
regenerative braking mode activated (power 
indicator in the  CHARGE zone).
With the vehicle connected, carry out 
temperature pre-conditioning before setting off.
To optimise consumption during a journey:    
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18
Instruments
The alert is given at whichever of these two 
terms is reached first.
The servicing information is displayed in the 
instrument panel. Depending on the version of 
the vehicle:
– 
The distance recorder display line indicates 
the distance remaining before the next service 
is due, or the distance travelled since it was due 
preceded by the "-" sign.
–
 
An alert message indicates the distance 
remaining, as well as the period before the next 
service is due or how long it is overdue.
The value indicated is calculated  according to the distance covered and 
the time elapsed since the last service.
The alert may also be triggered close to a 
due date.
Service spannerOn temporarily when the ignition is 
switched on.
Between 620 and 1,860 miles (1,000 and 3,000 
km) remain before the next service is due.
Fixed, when the ignition is switched on.
The next service is due in less than 620 
miles (1,000 km).
Have your vehicle serviced very soon.
Service spanner flashingFlashing then fixed, when the ignition is 
switched on.
The servicing interval has been exceeded.
Have your vehicle serviced as soon as possible.
Resetting the service indicator
The service indicator must be reset after each 
service.
If you have serviced your vehicle yourself:
â–º
 
Switch the ignition off. 
 
 
 
â–º Press and hold the button located on the end 
of the lighting control stalk.
â–º
 
Without pressing the brake pedal, press the 
ST
ART/STOP button once; a temporary display 
window appears and a countdown begins.
â–º
 
When the display indicates =0, a confirmation 
message appears; release the lighting control 
stalk button and the spanner symbol disappears.
If you disconnect the battery following 
this operation, lock the vehicle and wait 
at least 5 minutes for the reset to be 
registered.
Reminder of the servicing information
Servicing information is accessible using 
the “Check” button in the 
Settings>Vehicle touch screen application.
Engine oil level indicator
(Depending on version)
On versions fitted with an electric gauge, the 
engine oil level status is displayed on the 
instrument panel for a few seconds when 
the ignition is switched on, after the servicing 
information, in the form of messages.
The level read will only be correct if the  vehicle is on level ground and the engine 
has been off for more than 30 minutes.
Low oil level
This is indicated by the message " Oil 
level incorrect" on the instrument panel, 
accompanied by the lighting of the Service 
warning lamp and an audible signal.
If a low oil level is confirmed by a check using 
the dipstick, the level must be topped up to avoid 
damage to the engine.
For more information on  Checking levels, refer 
to the corresponding section.
Oil gauge malfunction
This is indicated by the message " Oil level 
measurement invalid" on the instrument panel.
Contact a CITROËN dealer or a qualified 
workshop.   
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19
Instruments
1In the event of a malfunction of the 
electric gauge, the oil level is no longer 
monitored.
If the system is faulty, you must check the 
engine oil level using the manual dipstick 
located in the engine compartment.
For more information on  Checking levels, 
refer to the corresponding section.
Coolant temperature 
indicator
This information is only available in the 
instrument panel's customisable area.
For more information on the  Digital instrument 
panel, refer to the corresponding section.
 
 
With the engine running:
–  In zone  A, the temperature is correct.
–
 
In zone 
 B, the temperature is too high. 
The associated warning lamp and the 
STOP
  warning   lamp light up in red on the 
instrument panel, accompanied by the display of 
a message and an audible signal.
You must stop the vehicle as soon as it is 
safe to do so.
Wait a few minutes before switching off the 
engine.
After switching off the ignition, carefully  open the bonnet and check the coolant 
level.
For more information on  Checking 
levels, refer to the corresponding 
section.
Power indicator 
(Rechargeable hybrid)
The power indicator shows in real time the power 
demanded from the vehicle.
There are 3 zones: 
 
 
POWER High power demand, using the  combined capabilities of the petrol 
engine and the electric motor.
The slider is located in this zone 
during more dynamic driving phases 
when high levels of performance are 
being demanded.
ECO Optimal use of energy (internal combustion or electric).
The slider is located in this zone 
when driving under electric power 
and when optimal use is being made 
of the petrol engine, both accessible 
by adopting a suitable driving style.
A symbol indicates the threshold at 
which the petrol engine will restart. 
The driver can therefore moderate 
their acceleration to remain in electric 
driving mode.
CHARGE Energy recovery for partly  recharging the traction battery.
The slider is located in this zone 
during deceleration: taking your foot 
off the accelerator pedal or braking.
Partial recharging of the battery by 
energy recovery has no effect on the 
charge level indicator.
Charge level indicator 
(Rechargeable hybrid)
 
 
The charge level of the traction battery and 
the remaining range in electric driving mode 
are permanently displayed when the vehicle is 
switched on.   
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Instruments
The range displayed depends on the use of the vehicle (type of driving and speed), 
the outside temperature and the activated 
comfort equipment.
Manual test
This function allows you to check certain 
indicators and display the alerts log.
The test is launched in the  Settings>Vehicle touch screen 
application.
â–º
 
Then select 
 Safety>Check .
The following information is displayed on the 
instrument panel:
–
 
T
yre pressures.
–
 
Engine oil level (depending on engine).
–
 
Next service due.
–
 
Current alerts.
This information is also displayed  automatically every time the ignition is 
switched on.
Total distance recorder
The total distance recorder measures the total 
distance travelled by the vehicle since its initial 
registration.
With the ignition on, the total distance is 
displayed at all times. It remains displayed for 
30
  seconds after switching off the ignition. It is 
displayed when the driver's door is opened, and 
when the vehicle is locked or unlocked.
When travelling abroad, it may be 
necessary to change the distance units 
(km or miles): the road speed must be 
displayed in the local country’s official unit 
(km/h or mph).
The unit is changed via the application of 
screen settings, with the vehicle stationary.
Rechargeable hybrid vehicles
The total distance recorder is only 
accessible from the trip computer.
For more information on the  Trip computer, 
refer to the corresponding section.
Lighting dimmer
Used to manually adjust the brightness of the 
instruments and controls to suit the exterior light 
level.
It is configured in the Settings > 
Brightness  touch screen application.
â–º
 
In the “
 Cockpit” section, press or move the 
slider to the desired setting.
Trip computer
Displays information related to the current trip 
(range, fuel consumption, average speed, etc.).
Data displayed on the 
instrument panel
Display of the different tabs
 
 
 
 
â–º Pressing the button located on the end of the 
wiper control stalk displays the following tabs in 
turn:
–
 
Current information:
•
 
T
 otal range.
•
 
Current consumption (Petrol).
•
 
T
 otal odometer (Rechargeable hybrid).
•
 
T
 raction battery charge level percentage 
(Rechargeable hybrid).
•
 
Autonomy (Petrol or Diesel, only on the E-HUD).
•
 
Current consumption (Petrol or Diesel).
•
 
Stop & Start time counter (Petrol).
•
 
Percentage of the current journey travelled 
in all-electric driving mode (Rechargeable 
hybrid).
–
 
T
 rips "1" then "2":
•
 
A
 verage speed.
•
 
A
 verage fuel consumption.
•
 
Distance travelled.
Depending on the settings for the pages 
displayed on the instrument panel and 
the activation/deactivation of the extended    
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Access
2Do not put your head or arms through the 
open windows while the vehicle is moving - 
risk of serious injury!
Sunroof
The sunroof consists of a movable glass panel 
that slides over the roof and a blind that can 
be opened independently. Opening the sunroof 
automatically opens the blind.
â–º 
T
 o operate the panoramic sunroof, use the 
button in the roof console.
 
 
 
 
The sunroof can be operated when the ignition 
is turned on (if the battery is charged enough), 
with the engine running, in STOP mode of Stop 
& Start, and up to 45   seconds after turning off 
the ignition.
Precautions
Do not put your head or arms through the 
sunroof while the vehicle is moving - risk 
of serious injury!
Do not operate the sunroof if transverse 
roof bars are fitted - risk of serious 
damage!
Do not place heavy loads on the movable 
glass panel of the sunroof.
If the sunroof is wet, following a shower 
or washing the vehicle, wait until it is 
completely dry before opening.
Do not operate the sunroof if it is covered by 
snow or ice - risk of damage!
Use only plastic scrapers to remove snow or 
ice from the sunroof.
Regularly check the condition of the 
sunroof seals (e.g.   presence of dust, 
dead leaves).
If using a car wash, check first that the roof is 
correctly closed and keep the high-pressure 
jet at least 30 centimetres from the seals.
Never leave the vehicle with the sunroof 
open.
Operation
When opening the sunroof fully, the movable 
glass moves to a partially open position, then 
slides over the roof. Any intermediate position is 
possible.
Before operating the sunroof control 
button, ensure that no object or person 
might prevent the movement.
Pay particular attention to children when 
operating the sunroof.
If something is trapped when operating the 
sunroof, reverse the movement of the sunroof 
by pressing the appropriate control button.
The driver must ensure that passengers use 
the sunroof correctly.
Any manual intervention on the position of 
the sunroof may disturb the anti-pinch device. 
Perform a reinitialisation.
Anti-pinch system
If the sunroof encounters an obstacle when 
closing, the movement is automatically reversed.
Opening/closing the sunroof
â–º To open the sunroof, use the part of the 
button located towards the rear.
â–º
 
T
 o close the sunroof, use the part of the 
button located towards the front.
Operating the button
â–º Pressing the button beyond its point of 
resistance opens or closes the sunroof fully .
â–º
 
Pressing the button again stops the 
movement in progress.
â–º
 
By keeping the button pressed (without going 
beyond the point of resistance), the movement of 
the glass stops when this button is released.   
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49
Ease of use and comfort
3â–º Press the button 2 and tilt the backrest 
forwards or backwards to obtain the desired 
angle. 
Heating and Ventilation
Air intake
The air circulating in the passenger compartment 
is filtered and originates either from the 
exterior, via the grille located at the base of the 
windscreen, or from the inside in air recirculation 
mode.
Controls
The controls are accessible through the  Climate touch screen application and are 
also grouped on the centre console panel.
Air distribution 
 
1. Windscreen demisting/defrosting vents
2. Front side window demisting/defrosting vents
3. Adjustable and closable side air vents
4. Adjustable and closable central air vents
5. Air outlets to the front footwells
6. Air outlets to the rear footwells
7. Adjustable and closable air vents
Advice
Using the ventilation and air 
conditioning system
â–º
 
T
o ensure that air is distributed evenly, 
keep the external air intake grilles at the base 
of the windscreen, the nozzles, the vents, the 
air outlets and the air extractor in the boot 
free from obstructions.
â–º
 
Do not cover the sunshine sensor located 
on the dashboard; this sensor is used to 
regulate the automatic air conditioning 
system.
â–º
 
Operate the air conditioning system for at 
least 5 to 10 minutes once or twice a month to 
keep it in good working order
.
â–º
 
If the system does not produce cold air
 , 
switch it off and contact a CITROËN dealer or 
a qualified workshop.
When towing a large load on a steep gradient 
in high temperatures, switching off the air 
conditioning increases the available engine 
power, enhancing the towing capacity.
Avoid driving for too long with the  ventilation off or with prolonged operation 
of interior air recirculation. Risk of misting and 
deterioration of the air quality!
If the interior temperature is very high 
after the vehicle has stood for a long 
time in the sunshine, air the passenger 
compartment for a few moments.
Put the air flow control at a setting high 
enough to quickly change the air in the 
passenger compartment.
Condensation created by the air 
conditioning results in a discharge of 
water underneath the vehicle. This is perfectly 
normal.
Servicing the ventilation and air 
conditioning system
â–º
 
Ensure that the passenger compartment 
filter is in good condition and have the filter 
elements replaced regularly
.
We recommend using a composite passenger 
compartment filter. Thanks to its special active 
additive, this type of filter helps to purify the 
air breathed by the occupants and keep the 
passenger compartment clean (by reducing 
allergic symptoms, unpleasant odours and 
greasy deposits).
â–º
 
T
o ensure correct operation of the 
air conditioning system, have it checked    
Page 58 of 228
56
Ease of use and comfort
â–º With the charging area clear, place a device 
in its centre.
 
 
When the portable device is detected, the 
charger’s indicator lamp lights up green. It 
remains lit for the whole time that the battery is 
being charged.
The system is not designed to charge  multiple devices simultaneously.
Do not leave metal objects (e.g. coins, 
keys, vehicle remote control) in the 
charging area while a device is being charged 
- risk of overheating or interrupting the 
charging!
When using applications for a long time 
in combination with wireless charging, 
some smartphones may switch to thermal 
safety and cause some functions to stop.
Checking operation
The state of the indicator lamp allows the 
operation of the charger to be monitored.
State of the 
indicator lamp Meaning
Off Engine switched off.
No compatible devices 
detected.
Charging complete.
Fixed green Compatible portable  device detected.
Charging.
Flashing orange Foreign object detected in  the charging zone.
Portable device not well 
centred in the charging 
zone.
Fixed orange Malfunction of the  portable device's battery 
meter.
Device battery 
temperature too high.
Charger malfunction.
 
 
If the indicator lamp is fixed orange:
– remove the device, then place it back in the 
centre of the charging zone.
or
–
 
remove the device and try again in a quarter 
of an hour
.
If the problem persists, have the system checked 
by a CITROËN dealer or a qualified workshop.
Front armrest
It includes a storage space.
Opening 
 
â–º Press the lever beneath the cover.
The cover opens in two parts.
Closing 
 
â–º Fold back the two parts of the cover .   
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73
Safety
5accompanied by a message and an audible 
signal, indicates an EBFD malfunction.
You must stop the vehicle.
Stop as soon as it is safe to do so and switch off 
the ignition.
Contact a CITROËN dealer or a qualified 
workshop.
When changing wheels (tyres and rims), 
ensure that these are approved for your 
vehicle.
After an impact
Have it checked by a CITROËN dealer or 
a qualified workshop.
Emergency braking 
assistance (EBA)
This system reduces the emergency stopping 
distance, by optimising the braking pressure.
It is triggered in relation to the speed at which 
the brake pedal is depressed. The effect of this 
is a reduction in the resistance of the pedal and 
an increase in braking efficiency.
Post Collision Safety Brake 
(APCB)
If an accident is detected, the vehicle initiates 
automatic post collision braking. The goal of this 
system is to reduce the risk of further collisions if 
the driver does not react. The system is not operational if the capability of 
the vehicle to trigger and execute the automatic 
post collision braking is not available, as it can 
occur in destructive accidents or in other specific 
accident scenarios.
It is possible to override the automatic braking by 
pressing the brake pedal or accelerator pedal.
Operating conditions
The system operates, if the following conditions 
are met:
–
 
Airbags or pyrotechnic seat belt pretensioners 
have been deployed by the collision.
–
 
Braking systems and electric functions remain 
continuously operational during and after 
collision.
–
 
Driver has not depressed the brake or 
accelerator pedal.
Malfunction
In the event of a 
malfunction, one of these 
warning lamps will come on fixed on the 
instrument panel, accompanied by the Service 
warning lamp, the display of a message and an 
audible signal.
Visit a CITROËN dealer or a qualified workshop.
Anti-slip regulation (ASR)  / Dynamic stability control 
(DSC)
Anti-slip regulation (or traction control) optimises 
traction by using engine braking and by applying 
the brakes on the driving wheels to avoid one 
or more wheels spinning. It also enhances the 
vehicle's directional stability.
If there is a difference between the vehicle’s 
trajectory and the path desired by the driver, the 
dynamic stability control system automatically 
uses engine braking and the brakes on one or 
more wheels to return the vehicle to the desired 
path, within the limits of the laws of physics.
These systems are activated automatically every 
time the vehicle is started.
These systems are activated in the event of a problem with grip or trajectory 
(confirmed by this warning lamp flashing on the 
instrument panel).
Deactivation/Reactivation
In exceptional conditions (e.g. moving a vehicle 
that is bogged down in mud, stuck in snow , on 
loose soil), it may prove useful to deactivate the 
DSC/ASR systems, so that the wheels can move 
freely and regain grip.
Reactivate the system as soon as the level of 
grip permits.
It is configured in the ADAS touch screen 
application.    
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74
Safety
Deactivation/reactivation is confirmed by 
the lighting/switching off of this indicator 
lamp on the instrument panel and the display of 
a message.
The ASR system is reactivated automatically 
every time the ignition is switched on or at 
speeds over 31 mph (50
  km/h).
Reactivation is manual below 31 mph (50 km/h).
Malfunction
In the event of a malfunction, this warning 
lamp lights up on the instrument panel, 
accompanied by the display of a message and 
an audible signal.
Have it checked by a CITROËN dealer or a 
qualified workshop.
ASR/DSC
These systems enhance safety during 
normal driving, but should not encourage 
the driver to take extra risks or drive at high 
speed.
It is in conditions of reduced grip (rain, snow, 
ice) that the risk of loss of grip increases. It 
is therefore important for your safety to keep 
these systems activated in all conditions, and 
particularly in difficult conditions.
Correct operation of these systems depends 
on compliance with the manufacturer's 
recommendations relating to the wheels 
(tyres and rims), braking and electronic 
components, as well as the assembly and 
repair procedures provided by CITROËN 
dealers.
In order to ensure that these systems remain 
effective in wintry conditions, the use of snow 
or all-season tyres is recommended. All four 
wheels must be fitted with tyres approved for 
your vehicle.
All tyre specifications are listed on the 
tyre/paint label. For more information 
on Identification markings , refer to the 
corresponding section.
Trailer stability assist (TSA)
When towing, this system reduces the risk of the 
vehicle or trailer snaking.
Operation
The system is activated automatically when the 
ignition is switched on.
The electronic stability control system (ESC) 
must not have any faults.
The vehicle speed must be between 37 and 99 
mph (60 and 160
  km/h).
If the system detects that the trailer is 
snaking, it applies the brakes to stabilise 
the trailer and reduces engine power, if 
necessary, to slow the vehicle (indicated by the 
flashing of this warning lamp on the instrument 
panel and the brake lamps coming on).
For information on weights and towed loads, 
refer to the Engine technical data and towed 
loads section or your vehicle’s registration 
certificate.
To ensure safe driving with a  Towing device, 
refer to the corresponding section.
Malfunction
If a fault occurs, this warning lamp lights 
up on the instrument panel, accompanied 
by a message and an audible signal.
To continue towing a trailer, reduce speed and 
drive carefully!
Have it checked by a CITROËN dealer or a 
qualified workshop.
The trailer stability control system  provides an extra safety feature under 
normal driving conditions, when following the 
recommendations for use of trailers and 
current legislation in force in your country. It 
must not encourage the driver to take extra 
risks, such as using a trailer in unsuitable 
conditions of operation (e.g.
  excessive load, 
exceeded nose weight, worn or under-inflated 
tyres, faulty braking system) or driving at 
excessive speed.
In certain cases, the system may not detect 
trailer snaking, particularly with a light trailer.
When driving on slippery or poor surfaces, the 
system may not be able to prevent sudden 
trailer snaking.