CITROËN DS5 Owner's Handbook Manual page 38

Warning lamps
When the engine is running or the vehicle is being driven, illumination of one of the following warning lamps indicates a fault which requires action on
the part of the driver.
Any fault resulting in the illumination of a warning lamp must be investigated further by reading the associated message in the instrument panel screen.
If you encounter any problems, contact a CITROËN dealer or a qualified workshop.
Warning / indicator lamp
STOP
State Cause
fixed, associated Illumination of this warning lamp is
with another warning related to a serious fault with the
lamp, accompanied braking system, power steering, the
by an audible signal engine oil pressure or engine coolant
and a message in the temperature or a major electrical
screen. fault.
Action / Observations
Stop as soon as it is safe to do so as the engine may
cut out.
Park, switch off the ignition and call a CITROËN
dealer or a qualified workshop.