The powertrain control module isn't the only computer that you can find on contemporary cars, but it is the primary computer that controls most systems and functions for vehicles that utilize a PCM.

Read the Chevy High-Performance tech article on How to Program an OBD-II Powertrain Control Module.

The LS2 arrived with a split powertrain controller running on a new CAN interface; an engine control module (ECM) and a separate transmission control module (TCM) communicating across the General ...