Receptor for TNFSF5/CD40LG (PubMed:31331973). Transduces TRAF6- and MAP3K8-mediated signals that activate ERK in macrophages and B cells, leading to induction of immunoglobulin secretion (By similarity). {ECO:0000250|UniProtKB:P27512, ECO:0000269|PubMed:31331973}. This is the function of CD40 (CD40 molecule, ENSG00000101017).