2020 Subaru Legacy Won't Start

Common Causes for Your 2020 Subaru Legacy Not Starting and How to Resolve Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
38% chance it's the
Battery
0%
27% chance it's the
Alternator
0%
20% chance it's the
Starter
0%
15% chance it's
Something else
The most common reasons a 2020 Subaru Legacy won't start are a dead battery, an alternator problem, or failed starter.
  • Battery: A weak or failing battery can result in difficulty starting the engine and electrical system malfunctions.
  • Alternator: A failing alternator can result in insufficient electrical power, leading to battery drain and electrical system malfunctions.
  • Starter: A faulty starter motor or a weak battery can prevent the engine from cranking properly, leading to starting issues.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the initial diagnostic steps to take for a 2020 Subaru Legacy that won't start?

When your 2020 Subaru Legacy won't start, it's essential to adopt a methodical diagnostic approach to identify the root cause. Begin by checking the battery, as a weak or dead battery is often the simplest issue to resolve. Ensure that the battery terminals are clean and securely connected. Next, verify the fuel level in the tank; sometimes, a low fuel level can lead to starting problems. If both the battery and fuel levels are adequate, turn your attention to the ignition system. Inspect components like spark plugs and ignition coils for any signs of wear or damage. Utilizing an OBD-II scanner can also be beneficial, as it allows you to read any error codes that may indicate specific issues. If the ignition system appears functional, assess the starter motor to ensure it is engaging properly. Additionally, check the fuel system, including the fuel pump and filter, to confirm they are operational. Finally, if all else fails, consider potential mechanical issues, such as a seized engine or broken timing belt, which may require professional assistance. By following these steps, you can effectively troubleshoot the starting issue and determine the necessary actions to get your Subaru Legacy back on the road.

What are the common problems that could cause a 2020 Subaru Legacy to not start?

When troubleshooting starting issues in a 2020 Subaru Legacy, it's essential to consider several common problems that could be at play. A dead battery is often the first suspect, as it can result from age, extreme weather conditions, or simply leaving the lights on. If the battery is functioning but the engine still won't turn over, the starter motor may be faulty, preventing the engine from cranking. Additionally, problems within the fuel system, such as a clogged fuel filter or a malfunctioning fuel pump, can impede fuel delivery, making it difficult for the engine to start. Another potential issue is a faulty ignition switch, which can disrupt the electrical system's ability to engage properly. Worn or defective spark plugs can also hinder the ignition process, leading to starting difficulties. Lastly, if the alternator is not charging the battery effectively, it can result in a drained battery, compounding the starting issues. By systematically checking these components, DIY enthusiasts can identify and address the root cause of their Subaru Legacy's starting problems.

How urgent is it to address the starting issue in a 2020 Subaru Legacy?

When dealing with a starting issue in a 2020 Subaru Legacy, understanding the urgency of the situation is crucial for both safety and vehicle longevity. If the vehicle fails to start completely, it is imperative to address the problem immediately to avoid the risk of being stranded or causing further damage to the engine or electrical system. Intermittent starting problems may seem less urgent, but they can escalate into persistent issues that compromise reliability. Additionally, any warning lights on the dashboard should not be ignored, as they often indicate underlying problems that require prompt attention. Unusual noises or smells during the starting process can signal serious mechanical failures, necessitating immediate inspection. If there is any uncertainty regarding the severity of the issue, consulting a professional mechanic is advisable to ensure that the problem is accurately diagnosed and addressed. Timely intervention not only enhances the safety of your vehicle but also helps maintain its performance and reliability over time.

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