Lexus GX470 Tire Pressure Warning Light Stays On

Common Causes for the Tire Pressure Warning Light in Your Lexus GX470 and How to Resolve Them

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Reviewed by
Andrew Hajjar
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 GX470 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 GX470 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 of a TPMS control module failure are failing to alert the driver of underinflation or overinflation of one or more tires, failure to communicate with the body control module or TPMS sensors, or erroneously reporting incorrect tire pressure.

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 GX470

When dealing with the tire pressure warning light in your Lexus GX470, it's essential to adopt a systematic diagnostic approach. Start by resetting the tire pressure monitoring system (TPMS) to see if the warning light resolves itself. This can be done by turning the ignition to the "On" position without starting the engine and pressing the TPMS reset button until the light blinks three times. Next, check the tire pressure on all wheels, including the spare, as an amber warning light often indicates low pressure. If the light remains steady, it suggests that tire pressure needs to be addressed, while a flashing light points to a potential malfunction in the TPMS itself. Always refer to your owner's manual for specific instructions tailored to your vehicle model, as it contains valuable information on the reset process and troubleshooting steps. If these DIY methods do not rectify the issue, consider seeking professional help or visiting a tire service center for a comprehensive check.

What to Check When the Tire Pressure Warning Light Stays On in a Lexus GX470?

When the tire pressure warning light stays on in your Lexus GX470, it’s important to identify the common problems that could be causing this alert. One of the most frequent culprits is low tire pressure, which can result from temperature fluctuations or slow leaks. Regularly monitoring your tire pressure against the recommended levels is essential for vehicle safety. Additionally, physical damage to the tires, such as punctures, cuts, or bulges, can lead to air loss and trigger the warning light. Another possibility is a malfunctioning Tire Pressure Monitoring System (TPMS) sensor, which may need recalibration or replacement. In some instances, the warning light could indicate issues with the vehicle's electrical system or a blown fuse associated with the TPMS. If you have already checked the tire pressure and inspected the tires for damage but the light remains illuminated, it may be wise to seek professional assistance for a comprehensive diagnosis. By understanding these common problems, you can take proactive steps to address the tire pressure warning light effectively.

Why is the Tire Pressure Warning Light Staying On in a Lexus GX470?

When the tire pressure warning light remains illuminated in your Lexus GX470, it is crucial to address the issue without delay. Ignoring this warning can lead to unsafe driving conditions, as under-inflated tires can compromise traction, increase tire wear, and even lead to blowouts. Start by manually checking the tire pressure in all four tires, ensuring they are inflated to the recommended PSI levels of 33-35. Be mindful of factors such as temperature fluctuations, which can affect tire pressure, and consider whether recent changes like new tires or tire rotations may have triggered the warning. If the pressure is adequate but the light persists, it may indicate a malfunctioning Tire Pressure Monitoring System (TPMS) sensor, which could stem from a dead battery or damaged components. Addressing these issues promptly not only enhances your safety on the road but also prevents further complications that could arise from neglecting the warning light.

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