U0100 stands for “Lost Communication with ECM/PCM.” The Engine Control Module (ECM) is the computer responsible for controlling the engine. The ECM communicates with other vehicle control units via a ...

PCM stands for powertrain control module. This technology combines both the TCM and ECM in one module, which is why it is found in newer models. Prior to this technology, both a TCM and an ECM were ...

For example, an older vehicle may use an ECM and a TCM (transmission control module) to accomplish many of the same tasks as a PCM does in a newer car. The PCM and ECM perform similar duties when ...

The powertrain control module, aka PCM, is your vehicle’s brain. It manages the engine, transmission and other systems based on information it receives from various sensors around the vehicle ...

The engine controller—first called an engine control module (ECM), and then later called a powertrain control module (PCM) when the electronically controlled transmission was added—had the ...

With this code, the Engine Control Module (ECM) or Powertrain Control Module (PCM) detected high output voltage from the throttle position sensor A. The output voltage reached higher than 4.5 for over ...

Although “ECU” typically stands for engine control unit, that’s not always the case. It can also mean electronic control unit, which may be the same thing, but could also be something that ...