Get accessories for your programmer or tuner and add functionality to the OBDII port on your 2017-2019 Chevy/GMC 6.6L L5P Duramax with the OBDII Splitters & Accessories available. If you're looking to add extra electronic accessories that utilize the OBDII port on your vehicle an OBDII Splitter is the solution you need. Accessories like extension cables for tuners, programmers, or modules and OBDII covers are available for a variety of applications. Shop for OBDII Splitters & Accessories from brands like Bully Dog Technologies, Diablosport, SCT, all available at XDP.