Apparatuses, methods, and systems are disclosed for aggregating HARQ feedback and sidelink retransmission procedure. One apparatus includes a transceiver that transmits SL data to a set of receiver V2X UEs and listens for SL feedback from the set of the receiver V2X UEs. Here, the SL feedback indicates whether a receiver V2X UE successfully decoded the SL data transmission. The apparatus also includes a processor that aggregates HARQ feedback and sends an Aggregated Feedback message to a RAN node, the Aggregated Feedback message containing the aggregated HARQ feedback.