Electrical connector with terminal position assurance member

An electrical connector includes a housing and a terminal position assurance (TPA) member. The housing defines cavities that extend from a cable end of the housing parallel to a cavity axis and hold corresponding terminals therein. The housing includes first and second walls defining a TPA slot therebetween that is open to the cavities. The TPA member is mounted to the housing within the TPA slot such that a front side of the TPA member engages the first wall and a rear side of the TPA member engages the second wall. The TPA member is movable relative to the housing between an unlocked position and a locked position along an actuation axis perpendicular to the cavity axis. The TPA member in the locked position extends into the cavities, and the front side of the TPA member engages the terminals to retain the terminals within the housing.