: During deceleration, the PIM reverses this process, taking energy from the transmission's rotation and converting it back to DC to charge the battery.
Based on the search results, there is no widely recognized technical term, software acronym, or established automotive component known as a "tranny pim." tranny pim
often refers to a Power Inverter Module or sometimes a Powertrain Interface Module . : During deceleration, the PIM reverses this process,