If your car battery keeps dying overnight, a faulty PCM (Powertrain Control Module) could be the hidden cause. While most people blame the battery or alternator, the PCM can sometimes stay active when it shouldn’t, draining power even when the vehicle is off.
In this guide, we’ll explain how a bad PCM can drain your battery, the warning signs to look for, and how to fix the issue before it leaves you stranded.
👉 Battery keeps dying? Read our ECM symptoms guide
👉 Transmission issues? See if your PCM is the cause
👉 Need a fast fix? Start your repair here
