What can cause a Subaru to not start?
If your Subaru won't start, there could be several potential causes. The most common reasons include a dead battery, a faulty alternator, a problem with the fuel system, or an issue with the ignition system. Let's explore these potential causes in more detail.
Dead Battery
A dead or weak battery is one of the most common reasons a Subaru won't start. The battery powers the starter motor, which is responsible for cranking the engine. If the battery is not holding a charge, the starter won't have enough power to turn over the engine. This can be caused by leaving the lights on, a faulty alternator, or simply an old battery that needs to be replaced.
Alternator Issues
The alternator is responsible for charging the battery while the engine is running. If the alternator is not functioning properly, it may not be able to keep the battery fully charged. This can lead to a dead battery and a Subaru that won't start. Signs of an alternator problem include a battery that drains quickly or a dashboard warning light indicating a charging system issue.
Fuel System Problems
Issues with the fuel system can also prevent a Subaru from starting. This could be due to a clogged fuel filter, a faulty fuel pump, or a problem with the fuel injectors. Without the proper fuel delivery, the engine won't be able to start and run.
Ignition System Malfunctions
The ignition system is responsible for providing the spark that ignites the fuel in the engine. If there's a problem with the spark plugs, ignition coils, or the ignition control module, the engine may not start. Symptoms of an ignition system issue include a clicking sound when trying to start the car or the engine cranking but not starting.
Other Potential Causes
In some cases, a Subaru may not start due to other issues, such as a problem with the engine sensors, a stuck or seized engine, or a problem with the electrical system. It's important to have a qualified mechanic diagnose the issue to determine the root cause and provide the appropriate repair.
If your Subaru won't start, it's best to have it inspected by a professional to identify the specific problem and get it resolved as soon as possible.
What happens if your car won't start but has power?
If your car has power but won't start, the problem is likely a bad starter motor, an issue with the fuel system, or a faulty ignition switch. You may hear a single click (which can point to a bad starter) or a whirring sound (which can mean a bad starter solenoid). Other less common causes include blown fuses, a security system issue, or a bad alternator.
This video explains the common issues why a car won't start but has power: 55sFixITYouTube · Jan 23, 2025
Common causes
- Starter motor: If you hear a loud click when you turn the key, the starter motor may be failing. It could be getting power, but it isn't able to turn the engine over.
- Fuel system: A bad fuel pump or clogged fuel filter can prevent the engine from getting the necessary fuel to start.
- Ignition switch: A faulty ignition switch may not be sending the "start" signal to the rest of the car, even if the lights and radio work.
- Blown fuse: A blown fuse can cause the car to have no power at all or only partial power, depending on which fuse is blown.
- Security system: Some anti-theft systems can prevent the car from starting as a security measure.
- Alternator: If your battery is getting low, the alternator may be failing and not charging the battery correctly.
What to do
- Check the basics: Make sure the gear shift is firmly in Park or Neutral. Also, check that the battery terminals are clean and tight.
- Listen for sounds: Turn the key to the start position and listen for any sounds. A single loud click points to the starter, a whirring sound suggests a bad starter solenoid.
- Don't keep cranking: Repeatedly cranking the engine can drain the battery further.
- If you suspect a specific issue, such as a blown fuse: Use a multimeter to check the fuses in the fuse box and replace any that are blown.
- If you're still unsure: It's best to have the car diagnosed by a professional to avoid any further damage.
What is Subaru's most common problem?
Subaru's most common problem: transmission failure
Transmission slipping: If your Subaru is shuddering when you accelerate, you might need to replace a solenoid (wire coil) in the engine.
How do you force restart a Subaru?
Press and Hold the Power Button: Press and hold the power button for approximately 10-15 seconds until the screen goes blank and the system powers off. Wait a Few Moments: Allow the system to remain powered off for a few moments before pressing the power button again to restart it.
What to do when your Subaru won't start?
When a Subaru won't start, first check the battery terminals for corrosion or loose connections. Test the battery voltage to ensure it's fully charged. Next, inspect the starter motor and solenoid for signs of wear or failure. Listen for clicking sounds indicating a faulty starter relay.
