2009 Subaru Impreza Won't Start

Common Causes for Your 2009 Subaru Impreza Not Starting and How to Resolve Them

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Reviewed by
Bo Fader
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 2009 Subaru Impreza 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 due to insufficient power supply.
  • Alternator: A failing alternator can result in insufficient electrical power to the vehicle, 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 2009 Subaru Impreza that won't start?

When your 2009 Subaru Impreza refuses to start, the first step is to check the battery, as a dead or weak battery is often the most common culprit. Ensure the battery terminals are clean and securely connected, and consider testing the battery voltage with a multimeter. If the battery appears to be in good condition, the next step is to inspect the alternator, which is responsible for charging the battery while the engine runs. A malfunctioning alternator can lead to insufficient power for starting. Following this, examine the starter motor, as a faulty starter can prevent the engine from cranking. Additionally, keep an eye out for any signs of rodent damage, as these pests can chew through essential wiring, leading to electrical issues. If these initial checks do not reveal the problem, performing a fault diagnosis using an OBD-II scanner can help identify any error codes that may indicate the source of the issue. By systematically following these steps, you can effectively troubleshoot the starting problem and take the necessary actions to get your Subaru Impreza back on the road.

What are the common problems that could cause a 2009 Subaru Impreza to not start?

When a 2009 Subaru Impreza refuses to start, several common issues may be at play, and understanding these can empower DIYers to tackle the problem head-on. One of the first things to check is the battery; a dead or weak battery is often the primary culprit behind starting failures. If the battery is functioning, the next step is to inspect the alternator, as a malfunctioning alternator can prevent the battery from charging properly, leading to starting issues. Additionally, a failed starter can also be responsible for the car not starting, so testing the starter is crucial. If the engine cranks but does not start, it may indicate problems with the air, fuel, or spark delivery systems, which can be diagnosed using an OBDII scanner to check for any trouble codes. Lastly, communication issues between the vehicle's systems can also hinder starting, so ensuring that all connections are secure and functional is essential. By systematically addressing these common problems, DIY enthusiasts can effectively troubleshoot and resolve starting issues with their Subaru Impreza.

How urgent is it to address the starting issue in a 2009 Subaru Impreza?

When dealing with a starting issue in your 2009 Subaru Impreza, it's crucial to recognize the urgency of the situation. While it may not seem like an immediate emergency, neglecting the problem can lead to more severe complications down the line. Intermittent starting issues can leave you stranded unexpectedly, making it essential to diagnose the root cause as soon as possible. Common culprits include a weak battery, faulty starter, or issues with the ignition system, all of which can escalate into costly repairs if left unaddressed. For DIY enthusiasts, taking the time to troubleshoot these problems can save you money and ensure your vehicle remains reliable. Start by checking the battery connections and testing the battery's voltage, as a simple jump-start may resolve the issue temporarily. However, if the problem persists, consider consulting repair manuals or online resources for further guidance on diagnosing and fixing the issue. By addressing starting problems promptly, you not only enhance your vehicle's reliability but also prevent potential safety hazards and more significant repairs in the future.

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