Fiat 500L Owner's Handbook Manual page 58

Warning light
31) Vehicle travel speed should always be adapted to the traffic and weather conditions, and must always comply with traffic regulations. The
engine can be stopped even if the warning light is on: however, repeated interruptions of the regeneration process could cause premature
degradation of the engine oil. For this reason, it is always advisable to wait for the warning light to go off before turning the engine off,
following the instructions appearing above. It is not advisable to complete DPF regeneration with the vehicle stationary.
56
DPF (PARTICULATE FILTER) CLEANING IN PROGRESS (Diesel versions with DPF only)
The warning light (on some versions, together with a message and a symbol on the display) switches on
constantly to notify the driver that the DPF system needs to eliminate captured pollutants (particulate)
through the regeneration process.
The warning light does not come on during every DPF regeneration, but only when driving conditions
require that the driver is notified.
To switch the warning light off, the car must be kept moving until the regeneration process is completed.
As an average, the process lasts fifteen minutes. The best conditions to complete the regeneration process
are reached driving the car at about 60 km/h with engine speed over 2000 rpm.
When this warning light switches on, it does not indicate a car failure and thus it should not be taken to a
workshop. On some versions, together with the warning light switching on, the display shows a dedicated
message.
31)
WARNING
What it means