2017 Subaru Legacy Won't Start

Common Causes for Your 2017 Subaru Legacy Not Starting and How to Resolve Them

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Reviewed by
Devin Cabugcal
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 2017 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 for a 2017 Subaru Legacy that won't start?

When your 2017 Subaru Legacy refuses to start, the first step is to check the battery, as a dead or weak battery is a common culprit. If the battery seems low, attempt a jump-start to see if that resolves the issue. Next, ensure that there is enough fuel in the tank, as running out of gas can often be overlooked. If the fuel level is adequate, turn your attention to the ignition system; listen for any sounds when turning the key, which can indicate whether the ignition switch is functioning properly. If you hear clicking noises, this may suggest a problem with the starter. To gain further insight, use an OBD-II scanner to check for any error codes that could point to specific issues. Additionally, inspect the fuses related to the starting system, as a blown fuse can prevent the vehicle from starting. Finally, take a moment to visually inspect the engine bay for any signs of damage or leaks that could be affecting the starting process. By systematically following these steps, you can effectively diagnose the starting issue and determine the best course of action for repair.

What are the common problems that could cause a 2017 Subaru Legacy to not start?

When your 2017 Subaru Legacy refuses to start, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the first things to check is the battery; a dead or weak battery is often the culprit, especially if the vehicle has been exposed to extreme temperatures or if lights were inadvertently left on. If the battery is functioning well, the next step is to inspect the starter motor, as a faulty starter can hinder the engine from cranking. Additionally, consider the fuel system; a clogged fuel filter or a malfunctioning fuel pump can prevent the engine from receiving the necessary fuel. Don't overlook the ignition switch, as a malfunction here can disrupt the electrical system's engagement. Lastly, examine the spark plugs; worn or faulty plugs can lead to ignition issues, making it difficult for the engine to start. By systematically checking these components, you can identify and resolve the starting problems with your Subaru Legacy, ensuring a smoother DIY repair process.

How urgent is it to address the starting issue in a 2017 Subaru Legacy?

Addressing the starting issue in your 2017 Subaru Legacy is not just a matter of convenience; it is crucial for maintaining the vehicle's overall health and safety. Ignoring a starting problem can lead to more severe mechanical or electrical failures, which may result in costly repairs down the line. For instance, if the issue stems from the battery or alternator, you risk being stranded if your vehicle fails to start unexpectedly. Moreover, delaying repairs can compromise the reliability and performance of your car, affecting your daily transportation needs. Therefore, it is essential to act promptly when you notice any starting issues to prevent further complications and ensure your vehicle remains safe and dependable on the road.

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