Clicking Noise When Starting: Battery, Starter or Engine?

Rapid clicking when you turn the key

Likely causes

• Weak or discharged battery
• Corroded or loose battery cables

What to check

1. Rapid clicking means the starter solenoid is trying but there is not enough power behind it. Try a jump start.
2. Clean and tighten the battery terminals even if the battery seems fine.
3. If the battery keeps dying, test the alternator, because a bad alternator will drain a good battery.

One loud click, then nothing

Likely causes

• Failing starter motor or solenoid
• Bad connection at the starter

What to check

1. If the headlights stay bright while you try to start, the battery is probably fine and the starter is the likely cause.
2. Check the heavy cable at the starter for corrosion or looseness.
3. A jump start that gives the same single click confirms it is not the battery.

Ticking or tapping that starts after the engine is running

Likely causes

• Low engine oil
• Noisy valve train (lifters) on a cold start
• Exhaust leak that ticks until the metal warms and expands

What to check

1. Check the oil level now, with the engine off and the car level.
2. If the tick fades once the engine warms, it is usually less serious, but mention it to a mechanic.
3. A tick that gets louder with engine speed is worth having inspected soon.

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