2018 Genesis G90 Won't Start

Common Causes for Your 2018 Genesis G90 Not Starting and How to Resolve Them

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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 2018 Genesis G90 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 Genesis G90 that won't start?

When troubleshooting a 2018 Genesis G90 that won't start, it's crucial to follow a structured diagnostic approach to efficiently identify the problem. Start with the simplest checks, such as the battery, since a weak or dead battery is a common culprit for starting issues. If the battery is in good condition, move on to verifying the fuel level; ensure there’s enough fuel in the tank, as running low can prevent the engine from starting. Next, examine the ignition system components, including spark plugs and ignition coils, as any faults here can disrupt the starting process. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into more complex issues that may be affecting the vehicle. If these initial steps do not resolve the problem, assess the starter motor to ensure it is functioning correctly, as a faulty starter can prevent the engine from turning over. Finally, inspect the fuel system, focusing on the fuel pump and filter, since any issues in fuel delivery can also lead to starting difficulties. By systematically addressing these areas, you can effectively diagnose and resolve the starting issue with your Genesis G90.

What are the common problems that could cause a 2018 Genesis G90 to not start?

When troubleshooting a 2018 Genesis G90 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, or simply leaving the lights on. If the battery is functioning but the car still won't start, the starter may be faulty, preventing the engine from cranking. Additionally, issues within the fuel system, such as a clogged fuel filter or a malfunctioning fuel pump, can hinder the engine's ability to receive the necessary fuel. Another potential culprit is the ignition switch; if it fails, turning the key may not engage the starting process. Furthermore, a faulty alternator can lead to insufficient battery charge, while worn-out spark plugs can disrupt the ignition of the fuel-air mixture. By understanding these common issues, DIYers can better diagnose and address the starting problems of their Genesis G90, potentially saving time and money on repairs.

How urgent is it to address the starting issue in a 2018 Genesis G90?

Addressing the starting issue in your 2018 Genesis G90 is not just a matter of convenience; it is a critical step in maintaining the vehicle's overall health and safety. Ignoring these symptoms can lead to more severe problems, such as engine failure or electrical system malfunctions, which can result in costly repairs down the line. A starting issue often indicates that essential components like the battery or starter motor may be failing, and if left unresolved, you risk being stranded in unsafe or inconvenient locations. This not only poses a safety risk but can also lead to further complications that could compromise your vehicle's reliability. Regular maintenance and prompt repairs are vital for the longevity of your car, making it imperative to address any starting issues as soon as they arise. By taking action now, you can prevent more significant problems in the future and ensure that your Genesis G90 continues to perform at its best.

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2018 Genesis G90 Starting Issues & Troubleshooting Guide