Get accessories for your programmer or tuner and add functionality to the OBDII port on your 2020-2023 Chevy/GMC 6.6L L5P Duramax with the OBDII Splitters & Accessories available. OBDII Splitters allow you to easily add multiple electronic accessories that use the OBDII port on your vehicle. Find the accessories you need for your tuner, programmer, or module including extension cables and OBDII port covers. Shop for OBDII Splitters & Accessories from brands like Bully Dog Technologies, Diablosport, SCT, all available at XDP.