Involved in the assembly of mitochondrial NADH:ubiquinone oxidoreductase complex (complex I, MT-ND1) (PubMed:27499296). Required to stabilize NDUFAF5 (PubMed:27499296). . This is the function of NDUFAF8 (NADH:ubiquinone oxidoreductase complex assembly factor 8, Ensembl gene identifier ENSG00000224877).