Acts as one of several non-catalytic accessory components of the cytoplasmic dynein 2 complex (dynein-2 complex), a motor protein complex that drives the movement of cargos along microtubules within cilia and flagella in concert with the intraflagellar transport (IFT) system. Required for proper retrograde ciliary transport. . This is the function of Ensembl gene identifier ENSG00000213123 (DYNLT2B, dynein light chain Tctex-type 2B).