Guide · 5 min read
Car Won't Start? What to Check and How to Fix It
The sound your car makes when you turn the key narrows down the cause. Here is how to read it and what to do next.
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By MyTowPublished 5 min read
Key takeaways
- Rapid clicking or a dim dashboard usually points to a weak or dead battery.
- Slow, labouring cranking points to a tired battery or cold weather.
- Cranking normally but not starting points to fuel or ignition, not the battery.
- Complete silence can mean a dead battery, a loose terminal or a gear or starter issue.
Start with the sound
When you turn the key or press start, listen before you try again and again. Repeated attempts can drain a weak battery further and flood some engines. The sound gives you a fast first diagnosis.
Clicking or a dim dashboard: the battery
A fast clicking noise or dashboard lights that dim or go out when you try to start usually mean the battery cannot deliver enough power. This is the most common cause, especially after lights were left on, the vehicle sat unused or the weather turned cold.
A battery boost normally fixes it. If the battery dies again within days, the battery or the charging system is failing and needs testing.
Slow cranking: tired battery or cold
If the engine turns over slowly, as if it is struggling, the battery is weak or the cold is thickening the oil. A boost may start the vehicle, but treat slow cranking as a warning to get the battery tested soon.
Cranks normally but will not start: fuel or ignition
If the engine spins freely but never catches, the battery is probably fine. A boost will not help; fuel delivery, ignition or a sensor is the likelier cause, and the safest fix is a tow to a repair shop.
- Check the fuel gauge; a gauge can be misleading on an old vehicle
- Listen for the fuel pump hum for a second or two when you switch the ignition on
- Make sure the key fob battery is not flat if you have a push-button start
- Do not keep cranking for more than a few seconds at a time
Silence: simple checks first
- Confirm the gear selector is in Park or Neutral and the brake pedal is pressed
- Try the headlights: if they are bright, the battery is probably not the problem
- Check the battery terminals for looseness or heavy corrosion
- Try the key fob's spare or the manual key slot if the vehicle uses an immobilizer
- If nothing responds at all, request a battery boost or a tow
When to stop troubleshooting
If you are on a highway shoulder, in a live lane or in an unsafe spot, stop checking and get safe first. If anyone is injured, there is a fire or smoke, or the vehicle blocks a live lane, call 911 first.
Never attempt to repair a vehicle while standing near moving traffic.
How MyTow can help
Request a battery boost for a drained battery, flat tire service or fuel delivery if that is the cause, or a tow if the vehicle cannot be started. Describe the sound and symptoms in your request so dispatch can confirm the right service.
Common problems and solutions
| Problem | What to do |
|---|---|
| Rapid clicking, dim lights | Weak or dead battery: request a battery boost, then have the battery tested. |
| Slow cranking in cold weather | Tired battery or cold oil: boost the vehicle and test the battery soon. |
| Cranks but will not start | Fuel or ignition issue: check fuel; a tow to a shop is usually the safest fix. |
| No sound and no lights | Dead battery or loose terminal: check terminals and the gear selector, then request a boost. |
| Starts then dies again within days | Failing battery or alternator: replace the battery and test the charging system. |
Need towing or roadside help now?
Depending on your situation, explore battery boost, breakdown towing or roadside assistance. MyTow is a digital app where you can request a tow or roadside assistance in less than one minute. This is the time to submit your request, not a truck arrival estimate. Arrival depends on your location, traffic and dispatch coverage.
Review towing and roadside assistance pricing factors, how MyTow’s online request process works and roadside safety tips.
This guide is general information, not legal or mechanical advice. In an emergency, call 911.
Related services
Towing
Breakdown Towing — service details
Engine, transmission or electrical failure? Get towed to your mechanic.
Roadside
Roadside Assistance — service details
Boosts, tire changes, lockouts and fuel — fixes that get you moving again.
Keep reading
Roadside fixes
How to Jump Start a Car Safely, Step by Step
Roadside fixes
Battery Boost vs Battery Replacement
Safety
What to Do When Your Car Breaks Down
Questions and answers
Why does my car click but not start?
Rapid clicking usually means the battery does not have enough power to turn the starter. It is most often a drained or failing battery, and a battery boost normally gets the engine running.
Can a car battery die without warning?
Yes, but signs often come first: slow cranking, dim lights, a battery warning light or repeated jump starts. Age matters too, since batteries weaken over several years.
Will a jump start fix a car that cranks but will not start?
No. If the engine cranks normally, the battery is delivering power. The problem is more likely fuel, ignition or a sensor and a boost will not help.
Is it bad to keep trying to start my car?
Repeated attempts drain a weak battery and can flood some engines. Try for a few seconds at a time and stop if there is no change.
Should I tow my car or boost it?
Boost if the symptoms point to a drained battery. Tow if the engine cranks but will not start, there are warning lights or smells, or a boost does not work.
What is "Car Won't Start? What to Check and How to Fix It" about?
The sound your car makes when you turn the key narrows down the cause. Here is how to read it and what to do next.
What are the key points in "Car Won't Start? What to Check and How to Fix It"?
Rapid clicking or a dim dashboard usually points to a weak or dead battery. Slow, labouring cranking points to a tired battery or cold weather. Cranking normally but not starting points to fuel or ignition, not the battery. Complete silence can mean a dead battery, a loose terminal or a gear or starter issue.
When should I call 911 instead of requesting a tow?
If anyone is injured, there is a fire, or your vehicle is blocking a live lane, call 911 first. Request a tow once everyone is safe.
Which MyTow services relate to this guide?
battery boost, breakdown towing, roadside assistance. Each has its own page with details, coverage and pricing factors.
How do I request help from MyTow?
Open the MyTow digital app at https://app.mytow.ca/request or call dispatch at (647) 633-8885. MyTow is a digital app where you can request a tow or roadside assistance in less than one minute. This is the time to submit your request, not a truck arrival estimate. Arrival depends on your location, traffic and dispatch coverage.
Request towing or roadside help with MyTow
MyTow is a digital app where you can request a tow or roadside assistance in less than one minute. This is the time to submit your request, not a truck arrival estimate. Arrival depends on your location, traffic and dispatch coverage.
