If your car won’t start after sitting for days or weeks, you can often narrow the cause down with a few simple, safe checks at home. This guide walks beginners through what to look, listen, and test for before calling a tow truck.

If your car starts fine during the day but refuses to start after sitting overnight or for a few days, you’re dealing with a different problem than a simple dead battery. Learn the most common causes, how to diagnose them at home, and when to call a pro—before you get stranded again.