For 1931 a roadster replaced a 4-seater cabriolet. Early this year a new, wide track chassis in addition to the previous bodywork in berline, conduite intérieure, familial, taxi or coupé-landaulet (with separation and more luxurious finish).
In September further expansion of the 'wide' models and a bigger, 10 CV engine. Carburettor with choke, self-locking brakes without servo, modified chassis, large hub caps. Chromed and no longer nickel-plated accessories, new almost square dials on chromed plate. Spare wheel in the left front wing on commerciale, familiale and all torpédos, modified boot with handles at the bottom on berline and conduite intérieure.
November: unification of doors on berline and conduite intérieure, with the consequence of creating conduite interieure (normal or wide) with large rear doors and small quarter glass on the long chassis, and a "berline de voyage” on chassis wide. New Grand Luxe range with thermostatic controlled radiator grille slats in chrome, 4 side bonnet flaps (6 on the C6) and Cromos bumpers, initially available in 10 body styles, with different chassis but after only a few weeks of production, the Grand Touring berline de voyage and conduite intérieure are only made on long wide track chassis.
Also in November C 4-IX 'economy' model with 9 CV engine, simplified finish (no hubcaps or boot), available in berline, berline commerciale, and camionette boulangere (baker's van) 500 kg