Car Won't Start — Just a Clicking Sound. What to Check.

What's happening

When you turn the key, the starter relay engages a high-current circuit that spins the starter motor. If the battery is too weak to handle that current, you hear the relay (or starter solenoid) clicking but the starter never turns. A series of rapid clicks = weak battery or bad connections. A single loud clunk = starter solenoid engaged, but the motor itself didn't or couldn't spin.

You might also notice

• Dim dashboard lights when turning the key
• Power windows slow or dead
• Radio resets when cranking
• Recently jump-started fine but dies again later

Likely causes (most common first)

1. Weak or dead battery (most common — 4–5 year battery life is normal)
2. Loose or corroded battery terminal
3. Bad ground strap (engine to chassis)
4. Failed starter motor or solenoid
5. Failing alternator that has been undercharging the battery for weeks
6. Parasitic draw (interior light left on, faulty module)

What to check first

1. Headlights: bright with key off, very dim with key turned to crank? → battery
2. Wiggle the battery terminals — corrosion or looseness causes intermittent no-starts
3. Try a jump start. If the car starts and stays running, drive 20 minutes and have the battery load-tested (free at most parts stores)
4. If a jump doesn't help, suspect the starter or main cables

Common OBD2 codes for this symptom

Don't have the code yet? Look up your code or read it with AXLY.pro.

Can I keep driving?

Once you get it running with a jump, drive straight to a parts store for a free battery test. Don't shut it off — you may not get it restarted.

Confirm with the actual code

Symptom-based diagnosis narrows the field — reading the actual stored code finishes the job. AXLY.pro is a free iPhone app that pairs with any Bluetooth OBD2 adapter and reads every stored DTC.