Car Won't Start but Clicks: What to Check First
Your car clicks when you turn the key but won't start? This usually points to a dead or weak battery, bad connections, or a failing starter. Here's how to diagnose and fix it yourself.
Vehicle Compatibility
Most fixes are simple and require basic tools
When you turn the key and hear clicking but your car won’t start, you’re dealing with one of the most common automotive problems. The good news? This is usually a simple fix you can handle yourself.
That clicking sound is your starter trying to engage but not getting enough power to turn the engine. In 90% of cases, it’s either a dead battery, corroded connections, or a failing starter.
Quick Answer
Most likely causes:
- Dead or weak battery (70% of cases)
- Corroded battery terminals (15% of cases)
- Bad starter (10% of cases)
- Loose connections (5% of cases)
- • Always wear safety glasses when working around batteries
- • Remove jewelry to avoid short circuits
- • Never smoke or use open flames near batteries
- • Use proper jack stands if you need to go under the car
Diagnostic Steps
Find the Problem in Order
Check these in sequence — easiest and most common first:
Check Battery Connections
Look at both battery terminals for white/green corrosion, loose clamps, or frayed wires.
Test Battery Voltage
Use a multimeter to check battery voltage. Should be 12.6V with engine off, 12.0V or higher when cranking.
Try Jump Starting
Connect jumper cables properly (positive to positive, negative to ground) and attempt to start.
Check Starter Connections
Locate starter (usually on engine block) and check for loose or corroded connections.
If all connections are good and jump starting doesn't work, the starter motor likely needs replacement. This requires lifting the car and working with heavy parts.
Tools & Parts You’ll Need
✓ Must-Have
- • Multimeter
For testing battery voltage
- • Wire brush or sandpaper
Clean corroded terminals
- • Adjustable wrench
Tighten battery clamps
+ Nice-to-Have
- ◦ Jumper cables or jump starter
For testing and emergency starts
Some links may be affiliate links.
Step-by-Step Solutions
1. Clean Corroded Battery Terminals
If you see white, blue, or green buildup on your battery terminals:
- Disconnect the negative terminal first (black cable)
- Disconnect the positive terminal (red cable)
- Mix baking soda and water (1 tablespoon per cup)
- Pour mixture over terminals and let it foam for 30 seconds
- Scrub with wire brush until terminals are shiny
- Rinse with clean water and dry completely
- Reconnect positive first, then negative
Apply terminal protectant spray or petroleum jelly to clean terminals to prevent future corrosion.
2. Jump Start Your Car
If the battery is weak but connections are clean:
- Position jump car close enough for cables to reach both batteries
- Turn off both vehicles and engage parking brakes
- Connect cables in this order:
- Red to dead battery positive
- Red to good battery positive
- Black to good battery negative
- Black to unpainted metal in dead car (ground point)
- Start the good car and let it run for 5 minutes
- Try starting the dead car
- Remove cables in reverse order once running
3. Test and Replace Battery
If jump starting works but the problem returns:
Battery Replacement: DIY vs Shop
DIY Option
Buy battery at auto parts store, install yourself
Shop Service
Shop tests, purchases, and installs new battery
To replace the battery:
- Buy the correct battery (check your owner’s manual for group size)
- Remove old battery (negative first, then positive)
- Clean battery tray if corroded
- Install new battery (positive first, then negative)
- Apply terminal protectant
Most auto parts stores will test your battery for free and dispose of your old one.
When the Starter is the Problem
If jump starting doesn’t work and connections are clean, you likely have a bad starter. Signs include:
- Single loud click when turning key
- Nothing happens (no click at all)
- Grinding noise when trying to start
Starter replacement typically costs:
- DIY: $150–$300 (parts only)
- Shop: $400–$800 (parts + labor)
This job requires lifting the car and working with heavy parts. Unless you’re experienced, this is often worth having a shop handle.
Prevention Tips
Keep your battery healthy: test voltage monthly during cold weather, clean terminals every 6 months, don’t leave lights on when the engine is off, drive regularly, and replace every 3–5 years depending on climate and usage.
Related Problems
If your car has other symptoms along with the clicking:
- Lights are dim: Definitely a battery issue
- Radio/electronics don’t work: Battery is completely dead
- Car cranks slowly then clicks: Weak battery or bad connections
- No click at all: Could be ignition switch, neutral safety switch, or completely dead battery
Recommended Products
NOCO Genius G3500 Battery Charger
from Amazon
Pros
- + Recovers completely dead batteries
- + Automatic shutoff prevents overcharging
- + Compact and portable
Cons
- − Takes several hours to fully charge dead battery
Optima RedTop Starting Battery
from Amazon
Pros
- + Excellent cold-weather performance
- + Vibration resistant
- + Longer lifespan than standard batteries
Cons
- − More expensive upfront
- − Requires compatible charger for best results
Bottom line: A clicking car that won’t start is usually a simple electrical problem. Start with the basics — clean terminals, test the battery, try a jump start. In most cases, you’ll be back on the road in under 30 minutes with minimal cost.
Remember: When in doubt, prioritize safety over savings. If you’re not comfortable with any step, there’s no shame in calling a professional.