Essential component of the TIM23 complex, a complex that mediates the translocation of transit peptide-containing proteins across the mitochondrial inner membrane (PubMed:10339406). Has a role in the activation of stress-induced mitophagy by protecting PINK1 from OMA1-mediated degradation and facilitating its accumulation at the outer mitochondrial membrane in response to depolarization (PubMed:37160114). {ECO:0000269|PubMed:37160114, ECO:0000305|PubMed:10339406}. This is the function of ENSG00000265354 (TIMM23, translocase of inner mitochondrial membrane 23).