Adult occupant
The passenger compartment remained stable in the frontal impact. Dummy readings indicated good protection for the knees and femurs of both the driver and front passenger dummies. Citroen also showed that a similar level of protection would be offered to occupants of different sizes and to those sat in different seating positions. The DS5 scored maximum points for the protection it provided in the side barrier test. However, in the more severe pole side impact test the chest was rated as weak. The front seat and head restraints provided marginal protection against whiplash injuries in a rear-end collision.

Child occupant
Based on dummy readings in the frontal and side impact tests, the DS5 lost a fraction of a point for the 3 year old child. The passenger airbag can be disabled to allow a rearward-facing child restraint to be used in that seating position, sufficient information was provided to the driver regarding the status of the airbag so the system was rewarded. Permanently attached labels on the sun visor clearly warn of the dangers of using a rearward facing child seat in that position without first disabling the airbag.

Pedestrian
The bumper provided good protection to pedestrians' legs. In the areas likely to be struck by the head of a child, the bonnet offered mixed protection with good, marginal and poor areas. In those areas likely to be struck by an adult's head, the protection was poor for the entire region ans was awared no points.

Safety assist
Electronic stability control and speed limitation devices are standard on the DS5 and both met most Euro NCAP's requirements. There is a seatbelt reminder system for the driver, passenger and rear seats.