What does PCM stand for pertaining to cars?

PCM is an acronym for Powertrain Control Module. The powertrain control module (PCM) performs many functions on your car. The module accepts information from the engine sensors and computes the required fuel flow necessary to maintain the correct amount of air/fuel ratio necessary for the engine to perform properly. Based on the information that is received and programmed into the the memory the PCM generates output signals to control relays, actuators, and solenoids PCM also sends out a command to the fuel injectors that meters the appropriate quantity of fuel. The PCM automatically senses and compensates for any changes in altitude.