You turn the key or press the start button and nothing happens, or the engine makes a strange noise and refuses to catch. A car that will not start is frustrating, but the symptom usually points to the cause. Does it click, crank slowly, crank normally but not fire, or do nothing at all? Use this guide to match what you hear and see to the most likely problem, run a few safe checks, and know when to call for help.
Quick answer
- Rapid clicking or dim lights: usually a weak or dead battery, or loose or corroded terminals.
- A single loud click, then nothing: often the starter or its connection.
- Engine cranks but will not start: the engine is missing fuel, spark or air, or the immobilizer is blocking it.
- No lights and no sound: battery connection, a blown main fuse or a completely dead battery.
- Check the basics first: gear selector, key fob, steering lock, dash lights and battery terminals.
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Step 1: Run These Quick Checks
- Is the car in Park or Neutral? Many automatics will not start in any other gear, and manual cars may need the clutch pressed.
- Is the key or fob working? A weak fob battery, or a key the immobilizer does not recognize, can stop the engine from starting. Try the spare key.
- Is the steering wheel locked? If the key will not turn, gently turn the wheel back and forth while turning the key.
- Look at the dashboard. Do the lights come on bright, dim or not at all? A security or key-shaped light that stays on may mean the immobilizer is the problem.
- Turn on the headlights. If they are dim or go out when you try to start, the battery is the likely suspect.
- Check the fuel gauge. Gauges can be wrong, but it is worth checking, especially if the car stalled recently.
Car Won’t Start: Causes by Symptom
1. Rapid Clicking When You Turn the Key
A fast clicking noise usually means there is not enough power to turn the starter. Common causes are a weak or discharged battery, loose or corroded battery terminals, or a failing alternator that has not been charging the battery. A jump start often gets the car going if the battery is simply discharged. See our jump starter guide and car battery replacement.
2. A Single Click, Then Nothing
One click with the lights staying bright often points to the starter motor or solenoid, or a poor connection to it. A failing starter can work intermittently at first. Read symptoms of a bad starter and starter replacement.
3. No Sound and No Lights
If nothing lights up and nothing makes a sound, check that the battery cables are tight and clean. A completely dead battery, a disconnected or corroded cable or a blown main fuse can all cause this.
4. Engine Cranks Normally but Won’t Start
If the engine turns over at a normal speed but never fires, it is not getting something it needs:
- Fuel: an empty tank, a failed fuel pump or relay, or a clogged filter. Listen for a brief hum from the rear when you turn the key to the on position. See fuel pump replacement.
- Spark: worn spark plugs or failed ignition coils. See ignition coil replacement.
- Engine sensors: a failed crankshaft or camshaft position sensor can stop an engine from starting. See crankshaft position sensor.
- Immobilizer or security system: a flashing security light and a car that cranks but will not fire may point here.
- Timing problems: a broken timing belt or chain can let the engine spin without compression, which needs a mechanic.
5. Lights Work, but the Engine Does Not Crank
If the dash and lights are normal but the engine will not turn, suspects include the starter, a faulty neutral safety switch or clutch switch, a bad ignition switch, or a poor starter connection. Try shifting to Neutral and restarting.
6. Starts With a Jump, Then Dies or Won’t Restart
If the car runs after a jump but dies again soon after, the alternator may not be charging the battery. See alternator replacement.
7. Won’t Start After a New Battery
Check that the terminals are connected tightly and correctly. A bad ground connection, a blown fuse, a faulty starter or other issues can still stop the car. Some vehicles also need the battery registered or the system reset, so check your owner’s manual.
8. Won’t Start in Cold Weather or When Hot
- Cold: batteries lose power in the cold, and thicker oil makes the engine harder to turn. A battery that is weak or old is more likely to fail on a cold morning.
- Hot: heat can make a weak starter or a failing sensor act up, then work again after the car cools down.
9. Won’t Start After Getting Gas
This can be caused by a fuel-related issue, including a problem in the vapor recovery (EVAP) system or wrong or contaminated fuel. If you think the wrong fuel was put in, do not keep trying to start it. Have the car towed to a shop.
Check Engine Light and Scan Tools
A check engine light or stored trouble codes can narrow the cause quickly, especially when the engine cranks but does not start. An inexpensive Bluetooth scanner can read codes on most modern cars. See our guide to the best Bluetooth OBD2 scanners.
Safety Tips
- Do not crank the engine continuously. Cranking for many seconds at a time can overheat the starter. Pause between attempts.
- Follow your owner’s manual when jump-starting, and be careful with hybrids and electric vehicles, which often have special jump procedures.
- Do not work under the hood in unsafe locations, such as on a busy road. Call roadside assistance if you are not safe.
- Wear eye protection near the battery, and never smoke or use flames near it.
- If you smell fuel or see smoke, stop and call for help.
When to Call a Mechanic or Tow
- The engine cranks but will not start after you have checked the basics
- You smell fuel, burning or see smoke
- A jump start does not work, or the car dies again after jumping
- You suspect the wrong fuel was added
- You are not comfortable working near the battery or under the hood
Related: Key won’t turn in the ignition? Causes and safe fixes
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Why does my car click but not start?
Rapid clicking usually means a weak battery or poor connection. A single click can point to the starter or its connection. A jump start or battery test can help tell them apart.
Why does my engine crank but not start?
The engine is likely missing fuel, spark or air, or the immobilizer is blocking it. A failed fuel pump, ignition components or crankshaft sensor are common causes, and a scan tool can help.
Can a bad alternator stop a car from starting?
Yes. A failing alternator can leave the battery too weak to start the car. If it starts with a jump and then dies again, the alternator is a prime suspect.
Why won’t my car start with a new battery?
Check that the terminals are tight and clean, and consider the starter, fuses, ground connection and other issues. Some cars also need a reset after a battery change.
Why won’t my car start when it’s cold?
Cold weather reduces battery power and thickens engine oil. A weak or old battery is the most common reason.
Can I fix a car that won’t start myself?
Often you can handle the basics: checking the gear, key fob, terminals and a jump start. For fuel, ignition or electrical issues you cannot find, a mechanic with the right tools will save time.
This article is for general information only and is not a substitute for professional diagnosis. Follow your owner’s manual and prioritize your safety.