The SAE term for the vehicle computer is:

The term "PCM," which stands for Powertrain Control Module, is the correct choice when referring to the vehicle computer. The PCM is a critical component that manages both the engine and transmission functions, integrating inputs from various sensors to optimize performance and efficiency.

It is responsible for assessing various signals (such as airflow, throttle position, and engine temperature) and executing appropriate control strategies, which includes fuel injection, ignition timing, and transmission shifting. This integrated approach helps ensure the vehicle operates smoothly and efficiently.

While other terms like ECM (Engine Control Module) and ECA (Electronic Control Assembly) are related, they have more specific meanings. The ECM generally focuses solely on the engine's operations, whereas the PCM encompasses both engine and transmission control. The term "Controller" is more generic and does not specify the functionality or the scope of what the PCM does. Thus, PCM is the most comprehensive and accurate term for the vehicle's central computing system.