2015 Lexus LX570 Won't Start

Resolve Starting Issues for Your 2015 Lexus LX570

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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 2015 Lexus LX570 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 2015 Lexus LX570 won't start?

When your 2015 Lexus LX570 refuses to start, the first step is to check the battery, as a weak or dead battery is often the primary culprit. Ensure that the battery terminals are clean and securely connected, and consider testing the battery's voltage with a multimeter. Next, verify the fuel level in the tank; sometimes, the simplest explanation is that the vehicle is out of gas. Pay attention to the dashboard lights when attempting to start the vehicle; if they flicker or dim, this could indicate an electrical issue. If the battery appears to be the problem, try jump-starting the car with jumper cables connected to a functioning vehicle. If the engine fails to crank, listen for any clicking sounds, which may suggest a faulty starter motor. Additionally, inspect the ignition switch; if the key feels loose or does not turn smoothly, it may need replacement. By systematically addressing these areas, you can effectively diagnose the starting issue and determine the necessary steps to get your Lexus back on the road.

What are the common problems that could cause a 2015 Lexus LX570 to not start?

When a 2015 Lexus LX570 fails to start, several common problems may be at play, each requiring careful consideration. A dead or weak 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 properly, the next area to investigate is the starter motor, which may be faulty and unable to turn the engine over. Additionally, issues within the fuel system, such as a clogged fuel filter or a malfunctioning fuel pump, can hinder the delivery of fuel necessary for ignition. The ignition switch is another critical component; if it is defective, it may not engage the electrical system correctly, leading to a no-start condition. Worn or faulty spark plugs can also impede ignition, making it difficult for the engine to start. Furthermore, problems with the ignition system, including a bad ignition coil or distributor, can contribute to these issues. In some cases, a malfunctioning security system may prevent the vehicle from recognizing the key, thereby blocking the starting process. Lastly, a failing alternator may not adequately charge the battery, compounding starting difficulties, while sensor or computer issues can further complicate the diagnosis. By systematically checking these components, DIYers can effectively troubleshoot and resolve starting issues with their Lexus LX570.

What are the potential risks and necessary steps to take if my 2015 Lexus LX570 won't start?

When your 2015 Lexus LX570 won't start, it's crucial to act promptly to avoid potential risks that could escalate into more significant problems. A dead battery is often the primary culprit, and if left unchecked, it can lead to complete battery failure, leaving you stranded. Additionally, a faulty starter can prevent your engine from turning over, and if ignored, it may require costly repairs or replacements. Fuel system issues, such as a clogged filter or malfunctioning pump, can also hinder your vehicle's performance, potentially leading to engine damage if the problem persists. Ignition system failures, including worn spark plugs or a defective ignition switch, can compromise your vehicle's reliability, while security system malfunctions may inadvertently lock you out of your own car. By promptly checking the battery, inspecting the starter, verifying fuel levels, and assessing the ignition system, you can mitigate these risks and ensure your Lexus remains in optimal condition. Addressing these issues swiftly not only enhances your safety but also prevents further damage that could result in expensive repairs down the line.

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2015 Lexus LX570 Starting Issues: Causes & Solutions | RepairPal