Engine Wont Turn Over
It's incredibly frustrating when your car won't start, especially when the engine refuses to even turn over. Take a deep breath; this is a very common issue, and in most cases, it's a straightforward fix.
This is one of the most common reasons a vehicle owner seeks help, often signaling a problem with the electrical system or the starter itself.
Can I drive my car right now?
No - do not drive
If your engine won't turn over, your car is completely immobilized. Attempting to force it or repeatedly try to start it can cause further damage, especially if the engine is seized, or drain a weak battery further. It's best to diagnose the issue where it sits.
When your engine won't turn over, the most common culprit is a dead or weak battery, followed by a faulty starter motor. Other causes include corroded battery terminals, a bad ignition switch, or, in rare cases, a seized engine. Diagnosis typically involves checking battery voltage and starter function.
What You'll Notice
- 1A single 'click' sound when turning the key or pressing the start button
- 2A rapid 'clicking' or 'chattering' sound from under the hood
- 3No sound at all when attempting to start the car
- 4Dashboard lights may be dim or not illuminate at all
- 5Headlights may be dim or not turn on
Most Likely Causes
Ranked by probabilityDead or Weak Battery
A dead or severely weak battery is the most frequent reason an engine won't turn over. If the battery doesn't have enough charge, it can't provide the necessary power to spin the starter motor. This resolves the issue in about 5 out of 10 cases.
Bad Starter Motor
Even with a fully charged battery, a faulty starter motor won't be able to engage and turn the engine over. You might hear a single click as the starter solenoid tries to engage, but the motor itself won't spin. This resolves the issue in about 2.5 out of 10 cases.
Corroded or Loose Battery Terminals/Cables
Even a fully charged battery can't deliver power effectively if the connections are poor. Corroded or loose battery terminals and cables create resistance, preventing enough current from reaching the starter. This resolves the issue in about 1 out of 10 cases.
Faulty Ignition Switch
The ignition switch sends the 'start' signal to the starter motor. If it's faulty, it won't complete the circuit, and the starter won't receive the command to engage. You might have power to accessories but no action from the starter. This resolves the issue in about 0.5 out of 10 cases.
Seized Engine
While rare, an engine can seize due to lack of oil, severe overheating, or internal mechanical failure. If the engine is seized, the starter motor physically cannot turn the crankshaft. This is a serious issue requiring extensive repair or engine replacement.
Don't Confuse With
Engine Cranks but Won't Start
If the engine 'cranks' (you hear the 'rrr-rrr-rrr' sound of the engine spinning), it means the starter and battery are likely working. 'Won't turn over' means no spinning at all, or a very slow, labored spin.
Empty Fuel Tank
An empty fuel tank will cause the engine to crank normally but not start. If your engine won't turn over, it's a power delivery issue to the starter, not a fuel delivery issue to the engine.
How to Diagnose
- 1**Check Battery Voltage:** Use a multimeter to measure the voltage across your battery terminals. A healthy battery should read around 12.6 volts or higher. If it's significantly lower (e.g., below 12V), your battery is likely the problem.
- 2**Inspect Battery Terminals and Cables:** Look for any corrosion (white, green, or blue powdery substance) on the battery terminals and cable ends. Ensure the cables are tightly secured. Clean any corrosion with a battery terminal brush and baking soda solution.
- 3**Attempt a Jump Start:** If your battery is weak, a jump start can temporarily get you going. If the car starts with a jump, the issue is almost certainly the battery or charging system.
- 4**Listen for Starter Sounds:** When you try to start the car, listen carefully. A single click often points to a bad starter solenoid or a very weak battery. Rapid clicking usually means a weak battery struggling to engage the starter. No sound at all could be a completely dead battery, a bad ignition switch, or a completely failed starter.
- 5**Test Starter Motor (Advanced):** If comfortable, you can test for power at the starter motor's main power wire and the solenoid trigger wire while someone attempts to start the vehicle. No power to the trigger wire suggests an issue with the ignition switch or wiring; power but no action suggests a bad starter.
Related OBD Codes
P0562 indicates low system voltage, often pointing to a weak battery or charging system issue. P0615 relates to the starter control circuit, suggesting a problem with the starter motor, relay, or wiring.
When to Call a Professional
- If you see signs of structural damage or severe corrosion on electrical components.
- If the repair requires specialty tools you don't have or access is extremely limited.
- If you suspect a seized engine, as this requires advanced diagnostics and potentially major engine work.
- If you're not comfortable working with electrical systems or getting under your vehicle, that's a smart decision – this is exactly what mechanics specialize in.
What to Tell Your Mechanic
Providing clear details helps your mechanic diagnose the problem quickly and accurately, potentially saving you time and money.
• What exactly happened when you tried to start the car (e.g., single click, rapid clicks, no sound)?
• Did any dashboard lights come on or dim?
• Have you noticed any issues with electrical accessories recently (e.g., dim headlights, slow windows)?
• When was the last time the battery was replaced?
Frequently Asked Questions
Why would my battery die suddenly?
Batteries can die suddenly due to leaving lights on, a faulty charging system (alternator), extreme temperatures, or simply reaching the end of their lifespan. Internal shorts can also cause rapid discharge.
Can a bad alternator cause my engine not to turn over?
Yes, indirectly. A bad alternator won't properly recharge your battery while you drive. Over time, this will drain the battery, eventually leaving it too weak to turn the engine over.
What's the difference between a single click and rapid clicking?
A single click often indicates the starter solenoid is engaging but the starter motor isn't spinning, possibly due to a very weak battery or a bad starter. Rapid clicking usually means the battery has just enough power to engage the solenoid repeatedly but not enough to spin the starter motor.
Is it safe to jump-start my car?
Yes, if done correctly. Always connect the positive (+) cable to the positive terminal of both batteries first, then the negative (-) cable to the negative terminal of the good battery, and finally the negative (-) cable to an unpainted metal surface on the dead car's engine block or frame. Consult your owner's manual for specific instructions.
How do I know I'm ordering the right part?
At Auto Barn, we make it easy. Simply enter your vehicle's year, make, and model on our website, and we'll show you only the parts guaranteed to fit your specific car. If you have any doubts, our customer service team is ready to help verify fitment before you order.
How long do car batteries typically last?
Most car batteries last between 3 to 5 years, though this can vary based on climate, driving habits, and maintenance. Extreme heat and frequent short trips can shorten a battery's life.
Can a fuse cause my engine not to turn over?
Yes, a blown fuse in the starter circuit (e.g., for the starter relay or solenoid) can prevent the starter from receiving power, leading to a no-crank condition.
Related Symptoms
Repair Cost Estimate
DIY (Quality Parts)
5-7 years (quality battery/starter)
$180-$450
Shop Repair
Parts + labor
$250-$700
Save $100-$300+ by performing the repair yourself, depending on the part.
Difficulty
intermediate
Time
0.5-2 hours
Parts You'll Need
Car Battery
A new battery resolves the 'engine won't turn over' issue in about 50% of cases, providing the necessary power for your starter.
You'll need one battery. Ensure it matches your vehicle's specifications.
Starter Motor
A new starter motor is the fix for about 25% of 'engine won't turn over' situations, ensuring the engine can physically rotate to begin combustion.
You'll need one starter motor.
Tools You'll Need
- Multimeter
- Battery terminal brush
- Wrench set (for battery terminals and starter bolts)
- Socket set
- Battery terminal puller (optional, but helpful)
- Wire brush (for cleaning connections)
Safety Gear
- Safety glasses
- Nitrile gloves
- Mask (if dealing with battery acid or dust)
- Family-owned since 1957
- 990,000+ happy customers
- Fast nationwide shipping
- 30-day hassle-free returns
Guaranteed to fit or we'll make it right
Car problems always seem to happen at the worst time, leaving you feeling stuck and stressed. We're here to help you understand what's going on and get you back on the road with confidence.
Every car is different, and we want you to stay safe. If anything feels off during your inspection, or you're unsure about what you're seeing, a professional inspection is always a smart call. For brakes, steering, and suspension, we especially recommend having a mechanic verify before driving.