Adult occupant
The passenger compartment remained stable in the impact. Dummy reading indicated good protection of the knees and femurs of both driver and passenger. Peugeot were able to show that a similar level of protection would be provided to occupants of different sizes and to those sat in different positions. The car scored maximum points in the side barrier test. In the more severe side pole test, dummy readings of rib deflections indicated marginal protection of the chest. Protection against neck injuries in a rear collision was rated as poor, the car scoring no points in any of Euro NCAP's three whiplash tests.

Child occupant
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 regarding the status of the airbag is not sufficiently clear. The presence of ISOFIX anchorages in the rear seats was not clearly indicated.

Pedestrian
The bumper scored maximum points for the protection offered to pedestrians' legs. However, the bonnet surface offered predominantly poor protection to the head of a struck child or adult.

Safety assist
The 308CC has electronic stability control (ESC) as standard equipment. A seatbelt reminder system covering the front and rear seats is also standard and the car is fitted with a driver-set speed limitation device.