Lexus LS500h Tire Pressure Warning Light Stays On

Common Causes for the Tire Pressure Warning Light in Your Lexus LS500h and How to Resolve Them

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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 Lexus LS500h 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 Lexus LS500h 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.

Troubleshooting Tire Pressure Warning Light in a Lexus LS500h

When faced with a tire pressure warning light in your Lexus LS500h, the first step is to check the air pressure in all tires, as low air pressure is the most frequent cause of this alert. Ensure that each tire is inflated to the recommended PSI, which can usually be found on a sticker inside the driver’s door. If the pressure is adequate, the next step is to inspect the tire pressure monitoring system (TPMS) sensors. A depleted battery in a sensor can trigger the warning light, so consider replacing any sensors that may be old or damaged. If the light persists, examine the TPMS receiver module for any malfunctions, as this component is crucial for relaying tire pressure information to the vehicle’s computer. If you’ve checked these elements and the warning light remains illuminated, it may be necessary to reset the TPMS. Locate the reset button under the steering wheel, press and hold it until the light blinks three times, then start the vehicle and allow it to run for about 20 minutes to refresh the system. If the tire pressure display is still not functioning correctly, further diagnostics may be required, such as checking for voltage supply issues or using a TPMS tool to identify any missing sensors. By following these steps, you can effectively troubleshoot the tire pressure warning light and ensure your Lexus LS500h is safe and road-ready.

Troubleshooting Tire Pressure Warning Light in a Lexus LS500h

When dealing with a tire pressure warning light in your Lexus LS500h, it's essential to understand the common problems that could be causing the alert. One of the most frequent culprits is low air pressure in one or more tires, which can easily be checked with a tire pressure gauge. If the pressure is adequate, consider the possibility of a depleted battery in the tire pressure monitoring system (TPMS) sensor, as this can also trigger the warning light. Additionally, a malfunctioning TPMS receiver module or a damaged pressure sensor may be at fault, both of which require further inspection. If you find that the tire pressure display is not functioning correctly, it may be necessary to replace expired TPMS batteries or damaged sensors, ensure there is sufficient voltage supply, or reset the TPMS to avoid complications. For a quick reset, locate the TPMS reset button under the steering wheel, press and hold it until the light blinks three times, and then start your vehicle. If the light persists, using a TPMS tool to scan for missing sensors or seeking professional assistance may be the best course of action. By understanding these common issues and their solutions, you can effectively troubleshoot the tire pressure warning light in your Lexus LS500h.

What Should You Do When the Tire Pressure Warning Light Stays On in a Lexus LS500h?

When the tire pressure warning light remains illuminated in your Lexus LS500h, it is crucial to take immediate action to ensure your safety and the longevity of your vehicle. Ignoring this warning can lead to decreased fuel efficiency, uneven tire wear, and even tire blowouts, which pose serious risks while driving. Start by checking the tire pressure in all four tires using a reliable gauge, as maintaining the correct pressure is essential for optimal performance. If the pressure is low, inflate the tires to the recommended levels found in your owner’s manual. Next, locate the TPMS reset button under the steering wheel and press it until the warning light blinks three times, indicating a reset. After resetting, start your vehicle and allow it to run for about 20 minutes to let the system recalibrate. If the light persists despite these efforts, it may indicate a deeper issue with the tire pressure monitoring system, and seeking professional assistance is advisable. By addressing the tire pressure warning light promptly, you not only enhance your driving safety but also protect your vehicle from potential damage.

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