2018 Lexus LC500 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2018 Lexus LC500: Causes and Solutions

Find Repair Location
Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Tire Leaking Air
0%
30% chance it's the
Wheel Leaking Air
0%
15% chance it's the
Tire Pressure Monitoring System
0%
15% chance it's
Something else
The most common reasons a 2018 Lexus LC500 tire pressure warning light stays on are a leaking tire, a wheel that no longer holds air, or a faulty tire pressure monitoring system.
  • Tire Leaking Air: A puncture, valve stem issue, or rim damage can cause a tire to leak air, leading to loss of pressure.
  • Wheel Leaking Air: A puncture or damage to the tire or rim can cause air to leak, resulting in a loss of tire pressure.
  • Tire Pressure Monitoring System: A malfunctioning tire pressure monitoring system can be caused by faulty sensors or a dead battery in the sensor units.
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.

How much does it cost to fix a 2018 Lexus LC500 tire pressure warning light stays on?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

When a tire pressure monitoring sensor fails, the tire pressure monitoring system control module will recognize a loss in communication and turn on the warning lamp which indicates the failure. This is most often the case. However, the tire pressure monitoring sensor may also fail by reporting incorrect tire pressures. This could cause a flat tire to go unrecognized, or a properly inflated tire to signal a low or high tire pressure warning.

When a relearn is needed, for any reason, the TPMS warning light will illuminate, and many vehicles will display a message relating to the TPMS system being inoperative or loosing communication. It is important to keep a watchful eye on tire pressures when this system is having issues because there is no warning available for underinflation or overinflation of the tires.

Wheels offer very few symptoms, but these symptoms should never be ignored. Visible cracks on the wheels may appear, especially after hitting a large bump, Most often, this will also be accompanied by loss of air from the tire on that wheel. Also, vibration in the steering wheel is very common when the tire is out of balance, and improper wheel nuts or bolts can cause creaking and popping noises to develop. Again, there are very few symptoms, but they should not be ignored.

The only symptoms requiring diagnosis for the tire pressure monitoring system warning lamp is if the warning lamp has illuminated while the tires have correct air pressure, or if the air pressure for the tires is out of specification and the warning lamp is off. This is because the overwhelming majority of cases where the TPMS lamp illuminates is due to the change in ambient temperature.

What are the initial steps to diagnose a tire pressure warning light that stays on in a 2018 Lexus LC500?

To effectively diagnose a tire pressure warning light that remains illuminated in your 2018 Lexus LC500, begin by checking the tire pressure in all four tires, including the spare. Use a reliable tire pressure gauge to ensure each tire is inflated to the manufacturer's recommended levels, as incorrect pressure is a common cause of warning lights. Next, visually inspect the tires for any visible damage such as punctures or bulges, which could indicate a loss of air. If the tires appear to be in good condition, attempt to reset the tire pressure monitoring system, as this can sometimes clear false alerts. Additionally, examine the valve stems for any signs of wear or leaks, as faulty stems can also trigger the warning light. Finally, if the light persists, consider using a diagnostic tool to scan for fault codes related to the tire pressure monitoring system, which can help identify more complex issues. By following these steps, you can systematically address the warning light and ensure your vehicle's safety on the road.

What could be causing the tire pressure warning light to stay on in a 2018 Lexus LC500?

When the tire pressure warning light stays on in a 2018 Lexus LC500, it can indicate several underlying issues that DIY enthusiasts should investigate. The most common reason is low tire pressure, so it's crucial to check and inflate all tires to the recommended levels. If the pressure is adequate, the problem may lie with a faulty tire pressure sensor, which could fail to provide accurate readings. Additionally, the tire pressure monitoring system itself might be malfunctioning, requiring a reset or recalibration to function correctly. Environmental factors, such as drastic temperature changes, can also affect tire pressure, making it important to keep an eye on weather conditions. Lastly, inspect your tires for any visible leaks or damage, as these can lead to pressure loss and trigger the warning light. If you've addressed these potential issues and the light remains illuminated, it's wise to consult a qualified mechanic for further diagnosis and resolution.

How urgent is it to address the tire pressure warning light on a 2018 Lexus LC500 that stays on?

Addressing the tire pressure warning light on a 2018 Lexus LC500 that remains illuminated is an urgent matter that should not be overlooked. Ignoring this warning can lead to serious safety concerns, as low tire pressure significantly impacts vehicle handling and braking, increasing the likelihood of accidents, particularly in critical driving situations. Additionally, driving on underinflated tires accelerates uneven wear, which not only shortens the lifespan of your tires but also raises the risk of a blowout, potentially leading to costly repairs and dangerous road incidents. Furthermore, low tire pressure can adversely affect fuel efficiency, resulting in higher fuel costs over time. Lastly, a persistent warning light may indicate a malfunction in the Tire Pressure Monitoring System (TPMS), necessitating repairs to ensure accurate monitoring of tire pressure. For these reasons, it is crucial to promptly investigate and resolve any issues related to the tire pressure warning light to maintain safety, vehicle performance, and cost-effectiveness.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.