Its location varies slightly depending on the year and specific model of your truck, but it's generally found under the hood, usually near the firewall, often attached to or near the intake manifold or a similar readily accessible area. You'll find it by looking for a fairly large, rectangular electronic control unit with numerous connectors. It might be covered in a protective plastic housing.
To be completely certain of its location on *your* specific truck, you should:
* Consult your owner's manual: This is the best place to start. The manual should have diagrams showing the location of major components, including the PCM.
* Use a repair manual specific to your truck's year and model: A Haynes or Chilton manual will contain detailed diagrams and information.
* Search online forums: Search for "[your truck year and model] PCM location" on forums dedicated to Chevy trucks. Someone likely has already posted pictures.
Important: Do not attempt any work on the PCM unless you're familiar with automotive electrical systems and safety precautions. Improper handling can damage the module and cost significant repairs.
