On a 1999 Ford F-350 with the 7.3L Power Stroke diesel, the Powertrain Control Module (PCM) is typically located
under the passenger-side dashboard, behind the glove box. You may need to remove the glove box to access it.
However, it's always best to double-check your specific truck's location using a repair manual or online diagrams specific to your year and model. The location might vary slightly depending on options and specific build.
