If you’ve encountered a PCM (Powertrain Control Module) programming error in your Nissan Altima, you’re not alone. This frustrating issue can prevent your car from starting, cause poor performance, or even leave you stranded. The good news? Most PCM programming errors can be resolved with the right approach. In this guide, we’ll break down: ✔ What a PCM does ✔ Why programming errors happen ✔ How to diagnose and fix the issue ✔ When to call a professional What Is the PCM in a Nissan Altima? The Powertrain Control Module (PCM) is essentially your car’s “brain.” It controls: Engine performance (fuel injection, ignition timing) Transmission shifting (in automatic models) Emissions…