The powertrain control module (PCM) and engine control modules (ECM) software may cause malfunction indicator lights to illuminate and a loss of drive power.

When an engine fails to restart it will increase the risk of a crash, the report said. As a remedy, dealers will reprogram the powertrain control module (PCM) and the battery energy control module ...

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.