2018 Subaru Impreza Won't Start

Common Causes for Your 2018 Subaru Impreza Not Starting and How to Resolve Them

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Reviewed by
Aisha
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 2018 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.
  • 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 for a 2018 Subaru Impreza that won't start?

When your 2018 Subaru Impreza refuses to start, the first step is to check the battery, as a dead or weak battery is a common culprit. If the battery appears to be the issue, attempting a jump-start can quickly determine if it’s the source of the problem. Next, ensure that there is sufficient fuel in the tank, as an empty or nearly empty tank can prevent the engine from starting. Following this, inspect the ignition switch to confirm it is functioning correctly; trying both keys can help rule out a faulty key. It’s also essential to examine the fuses related to the starting system, as a blown fuse can disrupt the starting process. Pay attention to any clicking sounds when turning the key, which may indicate a malfunctioning starter motor. Additionally, check the dashboard for warning lights that could signal specific issues, and consider using an OBD-II scanner to retrieve any error codes that might provide further insight into the problem. By systematically addressing these areas, you can effectively diagnose the starting issue and take the necessary steps to resolve it.

What are the common problems that could cause a 2018 Subaru Impreza to not start?

When troubleshooting a 2018 Subaru Impreza that won't start, it's essential to consider several common problems that could be at play. A dead 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 area to investigate 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. It's also important to check the ignition switch, as a malfunction here can disrupt the electrical system's engagement. Worn or faulty spark plugs and ignition coils can further complicate starting issues by failing to provide the necessary spark for ignition. Lastly, a malfunctioning fuel pump relay can hinder the fuel pump's operation, preventing fuel from reaching the engine. By systematically examining these components, DIY enthusiasts can effectively diagnose and address the starting problems of their Subaru Impreza.

How urgent is it to address the starting issue in a 2018 Subaru Impreza?

Addressing starting issues in your 2018 Subaru Impreza is not just a matter of convenience; it is crucial for your safety and the longevity of your vehicle. Ignoring these symptoms can lead to more severe problems, such as a complete failure to start, which can leave you stranded and vulnerable. Additionally, unresolved starting issues may indicate deeper mechanical problems that could escalate into costly repairs if not addressed promptly. By taking action at the first sign of trouble, you not only ensure the reliable performance of your vehicle but also mitigate the risk of safety hazards on the road. Therefore, it is essential to prioritize these concerns and seek solutions as soon as possible to maintain your Subaru's optimal functioning and avoid unnecessary expenses.

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