Enables carnitine transmembrane transporter activity. Acts upstream of or within carnitine transport. Located in peroxisome. Is intrinsic component of peroxisomal membrane. Is expressed in several structures, including genitourinary system; liver; lung; nasal cavity mucosa; and spleen. Human ortholog(s) of this gene implicated in Crohn's disease; cardiomyopathy; inherited metabolic disorder; and systemic primary carnitine deficiency disease. Orthologous to human SLC22A5 (solute carrier family 22 member 5). [provided by Alliance of Genome Resources, Apr 2022]