Powertrain Control Module (PCM) Description: Notes
WARNING: This page is about a different car, the 2002 GMC C3500 HD and 2002 Chevrolet C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) processes the various input information. The PCM sends the necessary electrical responses to control fuel delivery, spark timing, and other emission control systems.
The input information has an interrelation to more than one output. One failed input can affect more than one systems operation.