An engine needs three things to start — Compression, Spark, and Fuel.
There could be one of the 13 reasons why your Toyota Corolla won’t start.
This article will go over each reason step-by-step to diagnose and fix the issue.
By the end of this article, you will find the root cause why your Corolla isn’t starting, and we will have a working solution.
Is Your Corolla in “P” (Park)?
Toyota has implemented a safety feature in every Corolla. The car won’t start unless you put the gear into “P” (Park). If your gear lever is in D (Drive), R (Reverse), or N (Neutral), your Corolla won’t start.
It sometimes happens for many of us. We come to a full stop and turn off the engine before placing our car into PARK. As the Toyota Corolla has an engine brake, our car won’t move even when not in “P” (Park) while the engine isn’t running.
To start the engine, press the brake pedal and move the gear lever to “P” (Park). Now try starting your Corolla’s engine. If it were, for this reason, your car would start without any issue.
If the gear shift isn’t the problem, let’s diagnose further.
The Corolla has a 12V lead-acid battery. This battery lights up headlights, instrument clusters, and internal lights and helps start our cars’ engines.
An edge trimmer, chain saw, and generator typically have a coil starting method. We pull a cord fast to start the engine, once the engine starts, it will stay on as long as there’s gasoline in the tank.
In the case of the Toyota Corolla, a starting motor is connected to the 12V battery that starts the engine. This motor draws a lot of currents (400A to 500A) within a short period.
So, first, we would look into the 12V battery.
Corolla Starting Trick That Always Works
If you turn your car key and hear the engine turn a little bit but don’t start, follow this trick.
Turn the car key to the engine START position and DON’T LET IT GO. Hold the key at ignition. The engine will turn once and twice, and after a few seconds, your Corolla will start.
However, please do not crank the engine for more than 30 seconds at a time. It may overheat the starter and wiring system.
This trick will always work if your car battery is on the verge of being dead.
Look At Battery Terminal Oxidation
Many auto technicians will tell you that you probably have a dead battery if your Corolla doesn’t start. However, this statement isn’t accurate.
There are scenarios where a good battery will fail to start your Corolla.
Release the front engine compartment hood and open it.
The above image shows a battery that is only a few months old. But as you can see, both the positive and negative terminals have a lot of oxidation.
The 12V battery in the Toyota Corolla provides power or gets recharged as long as the car is on. Thus, it goes through a lot of stress and heat.
As it is a lead-acid battery, the terminal deposits a lot of oxidation material, preventing proper electrical connection to the starter motor. It also prevents recharging the battery properly.
Thus, this oxidation creates two problems. It prevents the starter motor from getting sufficient current and the alternator from recharging the 12V battery.
If your 12V battery terminal in the Toyota Corolla has a lot of oxidation, it needs a good cleaning.
To clean it properly, please take a wire brush (which we typically use to clean our BBQ stove) and kitchen tissue. We don’t need any liquid to clean the terminal.
Open both the positive and negative terminal from the battery —clean everything, including the electrical clamp, with the wire brush.
As the battery had a lot of oxidation, the probability is your 12V battery has a very low charge. Thus, please try the engine starting tips we described above.
Check the 12V Battery Wiring
The Toyota Corolla’s 12V battery wiring is very flimsy. The terminal corrodes over time due to moisture and can cause electrical connectivity issues.
Please check the wiring status by pulling it a little bit. Sometimes, these wires come loose and are the source of the problem.
Corolla’s 12V Battery is End of Its Life Cycle
The 12V battery cranking amps deteriorate over time, causing a lack of power to start the engine. It might have enough ability to run accessories like headlights, emergency flashers, dash, radio, etc. but not enough power to crank the Toyota Corolla’s engine.
The 12V battery that every Toyota Corolla comes from the factory has a maximum of 24 months life period. Sometimes, it may last a little bit longer. However, owners who live in colder climates will see a shorter lifespan from these batteries.
If the 12V battery in your Corolla is more than 24 months old, it’s better first to test the battery voltage status to determine the battery’s health.
Please remember that the 12V battery is 24 months old doesn’t mean your battery is bad. Some batteries that Walmart sells can last up to 36 months.
We need a voltage meter or multimeter to check the battery’s health. You can purchase these from Walmart.
A healthy battery on a Toyota Corolla should have 12.6V when the engine isn’t running.
Please don’t test the battery immediately after turning it off. Sometimes, these batteries will take charge from the alternator but slowly discharge. Thus, if you check the battery voltage immediately after turning off the engine, you will get a false reading.
If you are in a situation where getting a multimeter isn’t possible, here’s an easy check.
Turn your car key to the electrical ON position but don’t start the engine.
Now turn on headlights, dome lights, and emergency lights. If everything is working, then your 12V battery isn’t entirely dead.
Now, start the wiper. If it works sluggishly, the 12V battery has a very low state of charge.
The only solution is to buy a new 12V battery for your Toyota Corolla. We highly suggest you buy a battery with a 36-months warranty (Available at Walmart).
Sometimes, you can save some money on batteries with a 12-months warranty. Please don’t buy these. The 12 months battery warranty (at Walmart) means these batteries will last 12 months.
In the meantime, jump-start your Corolla. For this, you need another working car battery. If nothing is available at your disposal, please call the towing service.
After you start your Corolla, please directly drive to Walmart or AutoZone and buy a 12V battery.
Check the Battery Group Before Replacement
Different Toyota takes different battery group batteries. When you need a new battery for your Toyota Corolla, please buy the correct battery.
The 12V battery will show the battery group number. Here are some examples,
- H7 etc.
Serpentine Belt is Old
A generator (Alternator) in the Toyota Corolla makes electricity and recharges the 12V battery.
However, this alternator isn’t directly connected to the engine shaft. But it is indirectly connected through a rubber belt known as the serpentine belt. This belt drives the alternator, AC compressor, and water pump.
Over time this belt becomes stressed and fragile. Thus, it can’t tightly rotate the alternator to produce enough electricity.
As a result, the Corolla’s 12V battery can’t charge properly.
If the serpentine belt is old and has cracks, there’s a possibility that the car battery and alternator are in good condition. But as the belt fails to rotate the alternator shaft properly, the alternator isn’t producing enough power to recharge the 12V battery in the Toyota Corolla.
Thus if this is the case, please change the serpentine belt.
The belt costs around $30. However, with labor, the total replacement cost could be up to $120. But if you are handy, you can change the serpentine belt yourself. There are a lot of youtube tutorial videos.
Starter Motor May be Dead in Your Corolla
The starter motor rarely goes bad. These motors can last a very long time.
If you can jump-start your Corolla, your Starter Motor is in good health.
If you turn on the key and only hear a metal “click click click” sound, the probability is the starter motor has gone bad.
Unfortunately, if the starter motor is bad, you can’t start your Corolla’s engine. You must take your Corolla to the Toyota service center or an experienced auto mechanic shop.
Changing the starter motor on a Toyota Corolla typically costs $350 to $450.
Alternators rarely go bad. Thus, before changing the alternator, please diagnose the car further.
If the alternator has problems, it will fail to recharge your 12V onboard battery. The diagnosis is straightforward.
If you can jump-start your Corolla, don’t turn off the engine. Take a voltage meter and read the battery voltage while the engine is ON. The voltage should be more than 13.5V. If it’s not, your alternator has issues.
If your Corolla’s battery is not old, the battery terminal is clean, the serpentine belt is not cracked, and you started the Corolla a few days ago, the probability is the alternator may be faulty and needs replacement.
Changing the alternator is very costly. At a Toyota service center, it would cost up to $900 with parts and labor to replace the alternator for a Toyota Corolla.
Bad Fuel Pump
The fuel pump can get clogged or get bad. If it fails, your Corolla will not have enough fuel pressure to turn on the engine. Do the following steps to check whether the fuel pump is good or bad.
Turn the car key to the ON position and wait 3 seconds. Then turn the key to the LOCK position. Do this three times. When you turn the key to the ON position, there should be a whirring sound. Now, try to start the engine.
If your car fails to start, determine whether you heard a whirring sound while keeping the key in the ON position. If you heard it, the fuel pump might be working perfectly, and the problem is somewhere else. Otherwise, the fuel pump may have failed.
Blown Out Fuse
There are two fuse boxes in a Toyota Corolla.
One is inside your vehicle on the driver’s side below the steering wheel column. This fuse box controls all the electronics that are inside your Corolla.
The second fuse box is in the engine compartment and controls all the electronics outside your car, such as headlights, turn signal, starter motor, alternator, etc.
The alternator current goes through a fuse before reaching the 12V battery. If the alternator for some reason produces a sudden power spike, the fuse would blow and stop recharging the 12V.
The starter motor circuitry is also connected through a fuse. If, by any chance, the starter motor tries to draw more current than required, the fuse will cut off.
In both of these scenarios, you can’t start your Toyota Corolla.
Please check the fuse box that is inside your Corolla. When you open the fuse box cover, there is a diagram that outlines which fuse controls what. Check the alternator and starter motor controller fuse. If it’s blown, replace it with a similar amperage fuse.
Spark Plug Issues
Toyota Corolla has 4 iridium spark plugs. These spark plugs last up to 120,000 miles.
If not changed at regular intervals, the spark plug can get damaged and prevent your Corolla’s engine from getting started.
Please don’t use a platinum spark plug. These don’t last very long.
Moreover, always change the spark plug from a trusted auto mechanic shop or Toyota service center.
We also suggest you not buy spark plugs off Amazon. Amazon is full of fake spark plugs which can damage your engine.
In some rare scenarios, a broken ignition switch, clogged fuel filter, malfunctioned key or onboard immobilizer can prevent your Corolla from starting. However, these aren’t common.
Check the OBD Codes
If you have an OBD scanner, connect it to the OBDII port in your Corolla. Every Corolla has a sophisticated computer system that logs every error code.
As your engine isn’t starting, the onboard computer has already logged an error code which will tell you at what point the engine failed to start and what the problem is.
You can buy an OBDII scanner from Walmart, NAPA, AutoZone, Amazon, or other auto shops.
It’s a handy tool for diagnosing car issues.
Toyota Corolla Cranks But Not Starting
If your Toyota Corolla cranks but does not start, it means your 12V car battery has a low charge. There’s an easy trick to start the engine in this scenario.
Keep your car key on the engine start position, and DON’T LET GO. The engine will crank once, twice, and after a few seconds, the engine will start.
The 12V battery charge can drain overnight for several reasons. One reason is cold weather.
Every battery has a phantom drain (The battery slowly discharges by itself). On cold days, it gets worse.
If your 12V battery is 24 months old, please change the battery immediately.