Common Reasons My Subaru Would Not Start And How To Fix It
When my Subaru would not start, the culprit is often a dead battery, corroded terminals, a weak key fob, or a faulty starter motor. Cold weather and old fuel can also cause big headaches. This guide walks you through the most common reasons and gives you clear, step-by-step fixes you can do at home. We also share tips to prevent these problems before they leave you stranded.
There are few things more frustrating than turning the key and hearing nothing. You expect your Subaru to fire right up, and when it does not, it throws your whole day off. Whether you are heading to work or heading out on a weekend trip, a car that will not start is a serious problem.
This article breaks down the most common reasons my Subaru would not start. We cover battery issues, starter motor problems, fuel system failures, and more. Each section gives you practical fixes you can try yourself. Let us get into it.
Key Takeaways
- Dead or weak battery is the number one reason my Subaru would not start, especially in cold weather.
- Corroded battery terminals can block power even when the battery itself is fine.
- A failing starter motor causes a clicking sound but no engine crank.
- Old or contaminated fuel prevents proper combustion and stalling.
- Key fob or immobilizer issues can trick the car into thinking the wrong key is being used.
- Regular maintenance like cleaning terminals and replacing filters keeps your Subaru reliable.
- Knowing the symptoms helps you diagnose the problem fast and save money on repairs.
📑 Table of Contents
Why My Subaru Would Not Start: The Big Picture
When your Subaru refuses to turn over, the cause usually falls into one of five categories. These are battery problems, starter motor failures, fuel system issues, ignition switch troubles, and cold weather-related issues. Understanding which category your problem falls into saves you time and money.
Before you panic, take a deep breath. Most starting problems are simple to fix. You do not need to be a mechanic. You just need to know what to look for. This guide will help you do exactly that.
Let us start with the most common cause of all. The battery.
Dead Or Weak Battery
The battery is the heart of your Subaru’s electrical system. Without it, nothing works. When my Subaru would not start, the battery was the first thing I checked. And nine times out of ten, it was the problem.
Signs Your Battery Is Dying
How do you know the battery is the issue? Look for these clear signs:
- The engine cranks slowly or not at all when you turn the key.
- The dashboard lights are dim or flickering.
- You hear a rapid clicking sound but the engine does not turn over.
- The battery warning light on the dashboard is on.
- Electrical accessories like power windows respond slowly.
How To Fix A Dead Battery
If your battery is dead, you have a few options. First, try jump-starting the car with jumper cables and another vehicle. Connect the red clamp to the positive terminal, the black clamp to a ground point, and let the other car run for a few minutes before trying to start yours.
If jump-starting works, drive your Subaru for at least 20 minutes to recharge the battery. But if the battery keeps dying, it is time for a replacement. Older batteries lose their ability to hold a charge over time. A Subaru battery replacement is a straightforward job that most people can handle at home.
Quick Tip: Always keep a portable jump starter in your trunk. It is a small investment that can save you from a long walk home.
Corroded Battery Terminals
Even if your battery is fully charged, corroded terminals can block the electrical connection. White or blue-green buildup on the battery posts is a clear sign of corrosion. This gunk prevents electricity from flowing properly to the starter motor.
To fix this, disconnect the battery cables (negative first, then positive). Use a wire brush or a battery terminal cleaner to scrub away the corrosion. Wipe the terminals clean, reconnect the cables (positive first, then negative), and try starting the car again.
Prevention is easy. Apply a thin layer of petroleum jelly or a battery terminal protector spray after cleaning. This keeps moisture out and stops corrosion from coming back.
Starter Motor Problems
The starter motor is what cranks your engine when you turn the key. If it fails, your Subaru will not start no matter how much battery power you have. A bad starter motor is one of the most common reasons my Subaru would not start, especially in older models.
How To Tell If The Starter Motor Is Bad
Watch for these symptoms:
- A single loud click when you turn the key, but no cranking.
- Grinding or whining noises from under the hood.
- The engine does not respond at all, even with a fully charged battery.
- The starter stays on after the engine starts (rare but serious).
Fixing A Faulty Starter Motor
Sometimes the problem is not the starter motor itself but the starter relay. The relay is a small switch that sends power to the starter. If the relay fails, the motor never gets the signal to engage. Replacing a relay is cheap and easy.
If the starter motor itself is bad, you will need to replace it. This job requires getting under the vehicle. If you are not comfortable with that, a mechanic can do it for you. Expect to pay between $200 and $400 for parts and labor.
Fuel System Failures
Your Subaru needs fuel to run. If the fuel system has a problem, the engine will crank but not start. This is a very different symptom from a dead battery, and it points to a different set of causes.
Empty Fuel Tank
It sounds silly, but running out of fuel happens more often than you think. If the fuel gauge is acting strange, do not trust it blindly. Keep your tank at least a quarter full at all times, especially in winter.
Clogged Fuel Filter
The fuel filter keeps dirt and debris out of the engine. Over time, it gets clogged and restricts fuel flow. A clogged filter means the engine does not get enough fuel to start. Replacing the fuel filter is a quick and inexpensive fix. Most Subaru models need a new filter every 30,000 to 60,000 miles.
Failing Fuel Pump
The fuel pump pushes gas from the tank to the engine. When it fails, fuel never reaches the combustion chamber. You might hear a faint humming sound from the back of the car when you turn the key to the “on” position. No hum means the pump could be dead.
A fuel pump replacement is more expensive, usually between $400 and $800. But it is necessary if you want your Subaru to start again.
Ignition Switch And Key Issues
The ignition switch is what tells your Subaru to start. If it fails, the electrical systems might work, but the engine will not crank. This is a tricky problem because the symptoms can mimic a dead battery.
Worn-out key cylinders are another culprit. If your key is old or damaged, it might not turn the ignition properly. Try a spare key if you have one. Sometimes a copy works even when the original does not.
For Subaru models with keyless entry and push-button start, a weak key fob battery can prevent the car from recognizing the key. This is a common reason my Subaru would not start, especially in models with smart key systems. Replacing the key fob battery is simple and costs just a few dollars.
If you ever find yourself locked out, check out our guide on how to start a car without a key for emergency solutions.
Cold Weather Starting Problems
Cold weather is brutal on Subaru batteries and engines. When temperatures drop, the battery loses power and engine oil thickens. Both of these factors make starting much harder.
If my Subaru would not start in cold weather, the battery is usually the main cause. Cold temperatures reduce a battery’s ability to deliver cranking power. A battery that works fine in summer might fail in winter.
Here are some tips to prevent cold-weather starting problems:
- Keep your battery fully charged at all times.
- Use a battery blanket or heater in extremely cold climates.
- Switch to a lower-viscosity oil for winter driving.
- Park your car in a garage or sheltered area when possible.
- Let the car idle for a few seconds before driving in the cold.
For more help with cold-weather starting issues, read our article on car not starting when the battery is charged but it is cold. It covers battery behavior in low temperatures in detail.
Prevention Tips To Keep Your Subaru Starting Reliably
The best way to deal with starting problems is to prevent them in the first place. A little regular maintenance goes a long way. Here are the habits that keep Subaru owners smiling:
- Test your battery every six months. Most auto parts stores will test it for free.
- Clean the battery terminals twice a year. This prevents corrosion buildup.
- Replace the fuel filter on schedule. Check your owner’s manual for the exact interval.
- Keep a spare key fob battery on hand. It takes two minutes to swap and saves a lot of hassle.
- Drive your Subaru regularly. A car that sits for weeks can develop starting problems.
- Use the right oil for the season. Consult your owner’s manual for the recommended viscosity.
These simple habits take minutes but save you from hours of frustration. A well-maintained Subaru starts every time.
When To See A Professional
Not every problem is a DIY fix. If you have checked the battery, cleaned the terminals, and the car still will not start, it is time to call in the experts. Here are signs you need professional help:
- The check engine light is flashing.
- You smell gasoline near the engine.
- The engine cranks normally but will not fire.
- You hear knocking or unusual sounds from the engine bay.
- The problem keeps coming back after you fix it.
A mechanic can run a full diagnostic scan and find hidden issues. Sometimes the problem is a faulty sensor, a wiring issue, or a problem with the engine control module. These are not easy to fix at home.
For Subaru owners dealing with electrical gremlins, a professional diagnostic can save you from replacing parts that are not actually broken.
Final Thoughts
Dealing with a Subaru that will not start is stressful, but it does not have to be. Most starting problems come down to a few simple causes. A dead battery, corroded terminals, a bad starter motor, fuel system issues, or a weak key fob battery. Once you identify the cause, the fix is usually straightforward.
When my Subaru would not start, I now know exactly what to check first. And with the prevention tips in this guide, you can avoid most of these problems before they happen.
Keep your Subaru well-maintained, stay alert to warning signs, and you will spend far less time in the driveway and far more time on the road. Happy driving.
Frequently Asked Questions
Why does my Subaru click but not start?
A rapid clicking sound usually means the battery is too weak to power the starter motor. It could also point to a corroded terminal or a failing starter relay. Try jump-starting the car first, and if that does not work, check the starter motor and connections.
How long does a Subaru battery last?
Most Subaru batteries last between three and five years. Cold weather and short trips can shorten that lifespan. Have your battery tested every six months after the three-year mark to stay ahead of failures.
Can old fuel cause my Subaru not to start?
Yes. Gasoline degrades over time, especially if the car sits for months. Old fuel can clog the fuel filter and prevent proper combustion. If your Subaru has been sitting, drain the old fuel and refill with fresh gasoline.
What should I do if my Subaru key fob stops working?
Replace the key fob battery first. Most Subaru key fobs use a CR2032 coin battery. If replacing the battery does not help, the key fob itself may need reprogramming or replacement. Consult your dealer for assistance.
Is it safe to drive a Subaru with a flashing check engine light?
No. A flashing check engine light indicates a serious problem that could damage the catalytic converter. Pull over safely and have the car towed to a mechanic. Do not ignore this warning.
How can I prevent my Subaru from not starting in winter?
Keep your battery fully charged, use a battery blanket in extreme cold, switch to winter-grade oil, and park in a garage when possible. These steps dramatically reduce cold-weather starting problems.
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