2020 Lexus RC300 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2020 Lexus RC300: 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 2020 Lexus RC300 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 2020 Lexus RC300 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 2020 Lexus RC300?

To effectively diagnose the tire pressure warning light issue on your 2020 Lexus RC300, begin with the simplest and most straightforward approach. Start by checking the tire pressure in all four tires using a reliable tire pressure gauge, ensuring they are inflated to the recommended levels outlined in your vehicle's manual. This initial step is crucial, as incorrect tire pressure is a common cause of warning lights. Next, conduct a visual inspection of the tires for any signs of damage, such as punctures, cuts, or bulges, which could indicate a more serious problem. If the tire pressure is correct and the tires appear undamaged, proceed to reset the tire pressure monitoring system as per the instructions in your manual; this can often recalibrate the sensors and turn off the warning light. Additionally, inspect the valve stems for any signs of leaks or damage that might be affecting the system. If, after these steps, the warning light remains illuminated, it is advisable to consult a mechanic or dealership for a comprehensive diagnosis, as there may be underlying issues that require professional attention. By following this diagnostic approach, you can systematically address the tire pressure warning light issue and ensure your vehicle's safety and performance.

What could be causing the tire pressure warning light to stay on in a 2020 Lexus RC300?

When the tire pressure warning light stays on in a 2020 Lexus RC300, it can signal several underlying issues that DIYers can troubleshoot. The most common reason is low tire pressure, so start by checking each tire and inflating them to the recommended levels. If the pressure is adequate, the next step is to inspect the tire pressure sensors, as they may be faulty and require replacement or recalibration. Additionally, consider the sensor batteries, which can wear out over time and lead to persistent warning lights. It's also important to examine the wiring and connections of the tire pressure monitoring system for any damage or loose connections that could disrupt its operation. Environmental factors, such as drastic temperature changes, can affect tire pressure readings, so checking the pressure when the tires are cold is advisable for accuracy. If these steps do not resolve the issue, performing a system reset according to the manufacturer's instructions may help turn off the warning light. Should the light remain illuminated after these checks, seeking assistance from a qualified mechanic is recommended for a comprehensive diagnosis.

What should I do if the tire pressure warning light on my 2020 Lexus RC300 stays on?

When the tire pressure warning light on your 2020 Lexus RC300 remains illuminated, it is crucial to take immediate action to ensure your safety and the longevity of your vehicle. Ignoring this warning can lead to decreased traction, increased tire wear, and even tire blowouts, which pose significant risks while driving. Start by checking the tire pressure in all four tires, as underinflation is a common cause for the warning light. If you find any tires are below the recommended pressure, inflate them accordingly to help reset the tire pressure monitoring system. Additionally, inspect your tires for any visible damage, such as punctures or bulges, which could compromise their integrity. If the light persists after addressing the pressure and inspecting for damage, consult your vehicle's manual for instructions on resetting the system. Should the warning light continue to stay on, it is advisable to seek professional assistance, as there may be a deeper issue with the tire pressure monitoring system that requires expert attention. Taking these steps not only enhances your safety but also helps prevent costly repairs down the line.

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.