The passenger compartment remained stable during the impact. The driver's knees were well protected by an airbag mounted in the lower dashboard. Citroen showed that the airbag would also protect occupants who were larger or smaller than the dummy used in the test, and those sat in different seating positions. The passenger was well restrained and his knees did not get close to the dashboard. The C5 scored maximum points in the side impact test. In the more severe side pole test, the driver's chest scored no points owing to the rib deflections measured in the dummy. The protection provided against whiplash protection was also rated as poor.
The passenger airbag can be disabled to allow a rearward facing child restraint to be used in that seating position. However, information provided to the driver about the status of the airbag is not sufficiently clear. The label warning of the dangers of using a rearward facing restraint without first disabling the airbag was clear and permanently visible. The presence of ISOFIX anchorages in the rear outboard seats was not clearly marked.
The C5 was awarded no points for the protection offered by the front edge of the bumper to pedestrians' legs. The bonnet surface was also rated as predominantly poor in the area likely to be struck by an adult's head. However, the bumper scored maximum points.
In contrast to the previous C5, the seatbelt reminder system for the new car does not detect an occupant in the front passenger seat until the seatbelt has been buckled. It then warns the passenger if he unbuckles his belt. Euro NCAP requires the system to be able to warn front seat occupants that they are unbuckled at the start of a journey so Citroen's system was not rewarded for that seating position. The system met Euro NCAP's requirements for the driver's seat and the rear seats. Electronic Stability Control (ESC) is fitted as standard equipment on all variants, as is a driver-set speed limitation device.