2021 Subaru Crosstrek Won't Start

Resolve Starting Issues for Your 2021 Subaru Crosstrek

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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 Crosstrek 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 steps should I take to diagnose the starting issue in my 2021 Subaru Crosstrek?

When diagnosing the starting issue in your 2021 Subaru Crosstrek, it's essential to adopt a systematic approach that begins with the simplest checks before moving on to more complex diagnostics. Start by examining the battery, as a weak or corroded connection can often be the culprit behind starting problems. Ensure the terminals are clean and securely attached. Next, listen for any unusual sounds from the starter motor when attempting to start the vehicle, as this can indicate whether the starter is functioning correctly. Following this, inspect the ignition switch to confirm it is operating smoothly and sending the necessary signals to the engine. Don’t forget to check your fuel levels; sometimes, a low tank can lead to starting issues. Additionally, take a look at the spark plugs for any signs of wear or dirt, as faulty plugs can hinder ignition. If these initial checks do not resolve the issue, using an OBD-II scanner to identify any error codes can provide further insights. Lastly, examine the fuel system components, including the fuel pump and filter, to ensure they are working properly. By following this structured diagnostic approach, you can effectively identify and address the starting issue in your Subaru Crosstrek.

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

When your 2021 Subaru Crosstrek refuses to start, it can be frustrating, but understanding the common issues can help you diagnose the problem. 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 left on. If the battery is functioning, the next step is to inspect the starter motor, as a faulty starter can prevent the engine from turning over. Additionally, fuel-related issues, such as a clogged fuel filter or a malfunctioning fuel pump, can hinder the engine's ability to receive the necessary fuel. It's also important to consider the ignition switch; if it's not working properly, it may not engage the electrical system, leading to starting difficulties. Worn-out spark plugs can further complicate matters, as they are essential for proper ignition. Lastly, problems within the fuel and ignition systems, such as low fuel pressure or a faulty ignition coil, can also contribute to starting issues. By systematically checking these components, you can identify and potentially resolve the starting problems with your Subaru Crosstrek.

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

Addressing starting issues in a 2021 Subaru Crosstrek is of utmost importance, as neglecting these problems can lead to significant safety risks and potential damage to the vehicle. If the vehicle fails to start, it can leave you stranded, creating an urgent need for repair. Additionally, warning lights such as the check engine light should not be ignored, as they may indicate underlying issues that could escalate if left unaddressed. Intermittent starting problems, while seemingly minor, can evolve into more serious and consistent failures, making timely diagnosis and repair essential. Consulting a qualified mechanic or dealership service center can provide clarity on the urgency of the situation, ensuring that you avoid further complications and maintain the reliability of your Crosstrek. In summary, prompt attention to starting issues is crucial for both safety and the longevity of your vehicle.

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