What To Do When Your Car Won't Start

If you turn the key in the ignition or hit the push-start button and your car doesn't start, here are some of the most common causes and what you can do to troubleshoot the problem.

The car engine doesn't crank at all

A dead battery is the most common reason a vehicle won't start

Check that battery cable connections are tight
Try to start the vehicle
It that's not successful, you'll need to jump start your car
If the jump start works, run your car for 30 minutes so the battery can fully charge
If the jump start doesn't work, you'll need to call roadside assistance

Alternator is bad

Signs include interior light dimming and "check engine" light on
You'll need to have your vehicle towed to your mechanic

The car is in gear

Move the gear shift to park

A fuse is bad

Check your owner's manual for the fuse box and look for a blown fuse or wire damage
You'll need to have your vehicle towed to your mechanic

The key fob battery is dead

The push-start button will not receive a fob signal to start the car
You'll need to have your vehicle towed unless you can get to an auto parts store or car dealer to get a replacement battery

Starter is bad

Signs include a clicking noise when starting; dashboard lights work, but the engine doesn't crank, and the car doesn't turn over after a jump start

A clicking sound, but the engine doesn't turn over

Turn on your car's dome light; if it's dim, the battery may be weak when you try to start the engine and need a jump
Check and clean battery terminals if they show signs of corrosion, and make sure battery cable connections are tight
Depress the push-start button without applying the brake or turn the key to the start position, repeating each process several times; wait several minutes to start the car
See above "Starter is bad"

The engine cranks but won't start

Clogged fuel filter
Failed fuel pump
Bad timing belt
Need to replace spark plugs
The car is out of gas

Many auto parts stores and service centers offer a free diagnostic test — checking the alternator, battery charge, starter, and electrical cable connections — that can identify potential problems before they occur.

Calling roadside assistance when you encounter auto trouble is always an option if you're not comfortable troubleshooting the problem.

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References:

“Car Won’t Start — Battery, Alternator, or Starter?,” https://www.championautoparts.com/Parts-Matter/automotive-repair-and-maintenance/Car-Wont-Start.html.
Jeff Bogle, “15 Reasons Why Your Car Won’t Start,” https://www.rd.com/list/reasons-why-your-car-wont-start, (Updated: June 22, 2022).
Jake Rossen, “12 Common Reasons Your Car Won’t Start,” https://www.mentalfloss.com/article/639812/common-reasons-your-car-will-not-start, (January 29, 2021).