2018 Lexus GS450h Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2018 Lexus GS450h: Causes and Solutions

Find Repair Location
Reviewed by
Aisha
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 GS450h 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 GS450h 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 steps should I take to diagnose the tire pressure warning light issue on my 2018 Lexus GS450h?

To effectively diagnose the tire pressure warning light issue on your 2018 Lexus GS450h, begin with a straightforward approach that prioritizes simpler solutions before delving into more complex diagnostics. Start by checking the tire pressure in all four tires using a reliable tire pressure gauge, ensuring they are inflated to the levels recommended in your vehicle's manual. This initial step can often resolve the warning light if the pressure is low. Next, visually inspect each tire for any signs of damage, such as punctures or bulges, which could indicate a leak or other issues. If the tires appear to be in good condition, proceed to reset the tire pressure monitoring system (TPMS) according to the instructions in your manual; this can recalibrate the sensors and potentially turn off the warning light. If the light remains illuminated, it may be necessary to have a professional mechanic examine the TPMS sensors for faults, as a malfunctioning sensor could be the culprit. Lastly, consider any potential interference from electronic devices or nearby vehicles that might affect the TPMS functionality. By following this methodical approach, you can effectively diagnose and address the tire pressure warning light issue, ensuring your vehicle remains safe and roadworthy.

What could cause the tire pressure warning light to stay on in a 2018 Lexus GS450h?

When the tire pressure warning light stays on in a 2018 Lexus GS450h, it can signal a range of common issues that DIY enthusiasts can troubleshoot. The first step is to check the tire pressure in all four tires, as low pressure is the most frequent cause of the warning light. Ensuring that each tire is inflated to the manufacturer's recommended levels can often resolve the issue quickly. If the tire pressure is adequate, the next potential culprit could be a faulty tire pressure sensor. Inspecting the sensor for any visible damage or wear is a good practice, as a malfunctioning sensor may not provide accurate readings. Additionally, consider that the sensor's battery may need replacement, as these batteries can deplete over time. If the sensor appears to be functioning correctly, recalibrating it might be necessary; this can typically be done using an OBD-II scanner or by following the specific recalibration procedures in the vehicle's manual. Lastly, if the warning light persists despite these checks, it may indicate a deeper issue within the tire pressure monitoring system, such as wiring problems or control module malfunctions. Being proactive in diagnosing these issues is essential for ensuring the safety and performance of your vehicle.

What immediate steps should be taken to address the tire pressure warning light that remains on in a 2018 Lexus GS450h?

When the tire pressure warning light remains illuminated in your 2018 Lexus GS450h, it is crucial to act promptly to avoid potential safety hazards and costly repairs. Start by checking the tire pressure in all four tires, including the spare, using a reliable tire pressure gauge. Ensuring that each tire is inflated to the recommended levels can often resolve the warning light issue. If you find any tires underinflated, inflate them accordingly. Additionally, inspect the tires for visible damage such as punctures or bulges, as these can compromise safety and performance. If you make adjustments to the tire pressure or find damage, be sure to reset the tire pressure monitoring system, which can typically be done through the vehicle's onboard menu. Ignoring the warning light can lead to decreased fuel efficiency, uneven tire wear, and even tire blowouts, making it essential to address the issue without delay. If the light persists after these steps, seeking professional assistance is advisable, as there may be a deeper issue with the monitoring system that requires expert attention. Taking these immediate actions not only ensures your safety on the road but also helps maintain the longevity of your vehicle.

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.

2018 Lexus GS450h Tire Pressure Warning Light Issues