2016 Lexus GS350 Won't Start

Common Causes for Your 2016 Lexus GS350 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 2016 Lexus GS350 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 2016 Lexus GS350 won't start?

When your 2016 Lexus GS350 won't start, it's essential to adopt a methodical diagnostic approach to identify the root cause of the issue. Begin by checking the battery, as a dead or low battery is a common culprit; using a multimeter can help you assess its voltage. Next, ensure that there is sufficient fuel in the tank, as running out of gas can easily be overlooked. After confirming these basics, inspect the ignition switch to verify its functionality, as a malfunction here can prevent the engine from starting. If these initial checks do not resolve the issue, turn your attention to the starter motor, which may need testing to ensure it is operational. Utilizing an OBD-II scanner can also be beneficial, as it will reveal any error codes that could point to specific problems within the vehicle's systems. Additionally, examining the spark plugs for wear and tear is crucial, as faulty plugs can hinder ignition. Finally, assess the fuel system components, including the fuel pump and filter, to ensure they are working correctly. By following this structured approach, you can effectively diagnose and address the starting issues with your Lexus GS350.

What are the common problems that could cause a 2016 Lexus GS350 to not start?

When troubleshooting starting issues with a 2016 Lexus GS350, 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 component to check is the starter motor; a faulty starter may fail to crank the engine, leading to frustration. Additionally, problems 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 start. It's also crucial to examine the ignition switch, as a malfunction here can disrupt the starting process when the key is turned. Worn or faulty spark plugs can further complicate matters by hindering ignition, making it difficult for the engine to start. Lastly, if the vehicle's security system is malfunctioning, it may inadvertently prevent the car from starting. By systematically checking these components, DIY enthusiasts can effectively diagnose and address the starting issues with their Lexus GS350.

How urgent is it to diagnose and fix the starting issue in a 2016 Lexus GS350?

When it comes to diagnosing and fixing the starting issue in a 2016 Lexus GS350, urgency cannot be overstated. A malfunctioning starting system not only jeopardizes your safety by increasing the risk of being stranded or involved in an accident, but it can also lead to more severe mechanical problems if left unaddressed. For instance, a simple battery issue could escalate into complications with the alternator or starter motor, resulting in costly repairs that could have been avoided with timely intervention. Additionally, the inconvenience of a car that fails to start can disrupt your daily life, causing delays and frustration. Moreover, potential buyers may be deterred by unresolved starting issues, negatively impacting your vehicle's resale value. Therefore, it is crucial to prioritize diagnosing and fixing any starting problems promptly to ensure your safety, maintain the vehicle's performance, and protect your investment.

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