Subaru Forester Won't Start

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

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
38% chance it's the
Battery
0%
27% chance it's the
Alternator
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20% chance it's the
Starter
0%
15% chance it's
Something else
The most common reasons a Subaru Forester 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.

Troubleshooting Startup Issues in a Subaru Forester

When faced with startup issues in your Subaru Forester, it's essential to adopt a methodical diagnostic approach. Begin by checking the battery, as a weak or discharged battery is often the primary cause of starting problems. Use a multimeter to measure the battery voltage; if it’s below the recommended level, consider recharging or replacing it. Next, inspect the starter motor, as a malfunction here can prevent the engine from cranking. If the starter appears functional, turn your attention to the ignition switch, which is crucial for engaging the starter and powering the ignition system. If these initial checks do not resolve the issue, it may be wise to consider the auto start-stop system, particularly if you notice intermittent failures after the vehicle has warmed up. Should you feel uncertain at any point, seeking professional assistance is a prudent choice, especially if the problem persists despite your efforts. By following this structured approach, you can effectively diagnose and address the startup issues in your Subaru Forester, ensuring a smoother driving experience.

What to Check When Your Subaru Forester Won't Start?

When your Subaru Forester refuses to start, it can be frustrating, but understanding common problems can help you troubleshoot effectively. Start by inspecting the battery cables; corrosion or loose connections at the battery posts can disrupt the electrical flow necessary for starting. Next, ensure that the vehicle is in the correct gear, typically park or neutral, as the shift interlock system prevents the engine from starting in the wrong gear. If these checks don’t resolve the issue, consider the ignition switch, as a malfunctioning switch or key can hinder the starting process. Additionally, a faulty starter may be the culprit, so listen for any clicking sounds when you turn the key. A dead battery is another frequent issue, so testing or jump-starting the battery can often solve the problem. Lastly, while less common, engine issues such as a blown piston could also prevent starting, so be aware of any unusual noises or performance issues prior to the failure. If these steps do not lead to a solution, consulting a professional mechanic may be necessary to diagnose more complex problems.

Why is My Subaru Forester Not Starting?

When your Subaru Forester refuses to start, it’s crucial to act swiftly, as delaying repairs can lead to more severe issues and safety risks. Common culprits like a weak battery, faulty starter, or malfunctioning alternator can escalate if not addressed promptly. For instance, a drained battery may seem minor, but if left unchecked, it can lead to complete electrical failure, leaving you stranded. Similarly, a bad starter or ignition switch can prevent your vehicle from starting altogether, potentially leading to costly repairs down the line. Additionally, ensuring that your fuel tank is adequately filled and that battery cables are in good condition can prevent unnecessary headaches. By diagnosing and resolving these issues quickly, you not only ensure your Forester runs smoothly but also avoid the risk of being stranded or incurring significant repair costs. Taking immediate action can save you time, money, and ensure your safety on the road.

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