Why won't my car start?
A no-start almost always traces to one of a few systems: the battery, the starter, or the fuel and ignition. The clue is what happens when you turn the key. A rapid clicking usually means the battery, a single click can mean the starter, and a normal crank that never catches points at fuel or spark.
Most likely causes
Ranked from most to least common.
- 1A dead or weak battery (by far the most common), often from age, cold, or lights left on
- 2Corroded or loose battery terminals
- 3A failing starter motor, especially if you hear one click and nothing turns
- 4A fuel delivery problem, like a dead fuel pump or an empty tank
- 5An ignition, security, or immobilizer issue that blocks the start
What you can check
Safe, simple things to look at yourself.
- Turn on the headlights: bright and strong points away from the battery, dim points toward it
- Listen closely when you turn the key: rapid clicks, one clunk, or a crank that will not catch
- Wiggle the shifter into neutral and back to park, then try again
- Check for corrosion or a loose clamp on the battery terminals
What to do next
If it is the battery, a jump start will usually get you going so you can have it tested. If it cranks but will not catch, or you hear only a single click, it is worth having the starting and fuel systems checked.
Sources & further reading
- NHTSA — Vehicle safety & recalls — check whether a symptom traces to an open recall, free
- FTC — Auto repair basics — your consumer rights at the repair shop
- AAA — Car repair and maintenance costs — independent guidance on what repairs should cost
Cost ranges and guidance reviewed July 2026.
Keep exploring
What the fix typically costs
Related trouble codes
Car Won't Start FAQ
Common questions
Why won't my car start?
A no-start almost always traces to one of a few systems: the battery, the starter, or the fuel and ignition. The clue is what happens when you turn the key. A rapid clicking usually means the battery, a single click can mean the starter, and a normal crank that never catches points at fuel or spark.What is the most common cause?
The single most common cause is a dead or weak battery (by far the most common), often from age, cold, or lights left on. Also worth ruling out: corroded or loose battery terminals, and a failing starter motor, especially if you hear one click and nothing turns. If it is the battery, a jump start will usually get you going so you can have it tested. If it cranks but will not catch, or you hear only a single click, it is worth having the starting and fuel systems checked.What can I check myself first?
Start with the safe checks: turn on the headlights: bright and strong points away from the battery, dim points toward it. Then listen closely when you turn the key: rapid clicks, one clunk, or a crank that will not catch. Anything beyond that is worth leaving to a shop.
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