Powertrain Control Module Description: Notes

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Powertrain Control Module (PCM)

Courtesy of GENERAL MOTORS CORP.

The powertrain control module (PCM) is a precision 32-bit microprocessor and is an essential part of the electronic control system. The PCM is located underhood on the right side of the engine compartment. The PCM uses a KW2000 communication protocol. Communication with the PCM is through the data link connector located on the left side of the passenger compartment below the IP.

The PCM performs the OBD II diagnostic tests of the emission related systems. The PCM supplies a buffered voltage, called reference voltage, to the various information sensors and switches. The PCM controls most components with an electronic switch that completes a ground circuit when turned ON. The electronic switch is commonly referred to as an output driver. The PCM is also responsible for a self-diagnosis function and a fail-safe function.