2021 Subaru Forester Won't Start

Resolve Starting Issues for Your 2021 Subaru Forester

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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 2021 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.

What are the initial diagnostic steps to take when a 2021 Subaru Forester won't start?

When your 2021 Subaru Forester won't start, it's essential to adopt a systematic diagnostic approach to identify the underlying issue. Begin by checking the battery, as a dead or low battery is a common culprit; you can jump-start the vehicle or use a multimeter to measure the voltage. Next, ensure that there is sufficient fuel in the tank, as running out of gas can easily be overlooked. If these initial checks do not resolve the problem, inspect the ignition switch to confirm it is functioning correctly, as a faulty switch can prevent the engine from starting. Additionally, examine the starter motor for any signs of malfunction, as this component is crucial for initiating the engine's operation. It’s also wise to assess the fuel system for clogs that might hinder fuel delivery to the engine. If the issue persists, using an OBD-II scanner can help you retrieve error codes that provide valuable insights into potential problems. Lastly, inspect the spark plugs to ensure they are in good condition and firing properly, as faulty spark plugs can lead to starting difficulties. By following these steps, you can effectively diagnose and address the starting issues with your Subaru Forester.

What are the common problems that could cause a 2021 Subaru Forester to not start?

When troubleshooting a no-start issue in a 2021 Subaru Forester, it's essential to consider several common problems that could be at play. A dead or weak 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, the next component to check is the starter motor; a faulty starter may fail to crank the engine, leading to starting difficulties. Additionally, issues within the fuel system, such as a clogged fuel filter or a malfunctioning fuel pump, can prevent the engine from receiving the necessary fuel to ignite. The ignition system also plays a crucial role; problems with the ignition switch or worn spark plugs can hinder the starting process. Furthermore, a malfunctioning alternator may not adequately charge the battery, compounding the starting issue. Lastly, if the vehicle's security system is malfunctioning, it may inadvertently prevent the car from starting as a safety precaution. By systematically examining these areas, you can effectively diagnose and potentially resolve the starting issues with your Subaru Forester.

How urgent is it to address the starting issue in a 2021 Subaru Forester?

When dealing with a starting issue in a 2021 Subaru Forester, understanding the urgency of the situation is crucial for any DIY enthusiast. If the vehicle fails to start completely, it is imperative to act quickly to avoid being stranded or risking further damage to the engine or electrical system. Intermittent starting problems, while seemingly less urgent, can escalate into more serious issues if not addressed promptly, potentially leading to costly repairs down the line. Additionally, any warning lights on the dashboard or unusual noises during the starting process should not be ignored, as they often indicate underlying problems that could compromise the vehicle's safety and reliability. Regular maintenance plays a vital role in preventing these issues, so staying on top of scheduled services can help mitigate urgent situations. Ultimately, addressing starting issues as soon as they arise is essential for ensuring the longevity and dependability of your Subaru Forester, making it a priority for any responsible vehicle owner.

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