ECU Editor / Map Editor
TunerCat OBDII is the OBD-II product in the TunerCat family, focused on editing calibrations for later General Motors OBD-II PCMs. Using definition files for supported GM controllers, it exposes editable engine and transmission parameters such as fueling, spark, idle, shift, and limiter tables for GM cars and trucks, including popular LS-based applications. Users pair it with a compatible read/write cable or flashing device to pull the stock calibration, edit it in TunerCat OBDII, and write it back. It is aimed at hobbyists and budget-conscious GM tuners who want table-level control without a subscription-heavy platform. As with any definition-driven editor, coverage depends on the availability of the correct definition for the specific PCM and operating system. It sits within the broader GM DIY tuning community.
TunerCat OBDII edits GM gasoline PCMs table by table; Softechpro auto-applies EU diesel emissions/DTC-off modules and corrects checksums across many firmwares. The two serve different vehicles and workflows.
See Softechpro plansTry the file service