2015 Toyota Prius Tire Pressure Light Won't Go Off (TPMS)

Addressing the persistent TPMS warning light in the 2015 Toyota Prius

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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 2015 Toyota Prius 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 2015 Toyota Prius 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.

What steps should I take to diagnose why the tire pressure light won't go off in my 2015 Toyota Prius?

To effectively diagnose why the tire pressure light won't go off in your 2015 Toyota Prius, start with the simplest solutions before moving on to more complex diagnostics. Begin by checking the tire pressure in all four tires, ensuring they are inflated to the recommended levels specified on the sticker inside the driver’s door or in the owner’s manual. Use a tire pressure gauge for accuracy, as even minor discrepancies can trigger the tire pressure warning system (TPWS). If the pressures are correct, proceed to reset the TPMS by locating the reset button, typically found under the steering wheel or on the dashboard. Turn the ignition to the "ON" position without starting the engine, press and hold the reset button until the TPMS light flashes three times, then release it. If the light remains on or blinks, this may indicate a malfunctioning sensor, which could require diagnostic tools to identify the faulty component. Additionally, inspect for any flat tires or leaks, as these can also cause the warning light to activate. Remember to consider seasonal changes that can affect tire pressure, and if all else fails, consulting a mechanic may be necessary to address potential system failures. By following this structured approach, you can efficiently troubleshoot the issue and ensure your vehicle's safety.

What could cause the tire pressure light to remain on in a 2015 Toyota Prius?

When the tire pressure light remains on in your 2015 Toyota Prius, it can be frustrating, especially after you've checked and adjusted the tire pressures. One of the most frequent culprits is under-inflated tires, which can trigger the Tire Pressure Monitoring System (TPMS) to alert you if the pressure drops significantly. It's essential to verify that the tire pressures align with the specifications found in your vehicle's manual or on the sticker located on the driver's side door frame, as discrepancies can lead to the light staying on. Additionally, a malfunctioning TPMS sensor could be at fault; these sensors are battery-operated and may fail over time, particularly if your vehicle is older. If the light persists despite proper tire inflation, consider resetting the TPMS, which can often be done by following a simple procedure involving the ignition switch and the reset button. Lastly, if you've recently installed new sensors, they may require reprogramming to function correctly. If you've addressed these common issues and the light remains illuminated, consulting a professional mechanic may be necessary for further diagnosis.

How urgent is it to address the tire pressure light that won't turn off in a 2015 Toyota Prius?

Addressing the tire pressure light that won't turn off in a 2015 Toyota Prius is of utmost urgency due to the significant safety risks and potential vehicle damage associated with low tire pressure. Ignoring this warning can lead to reduced traction, increasing the likelihood of tire blowouts, which can result in serious accidents. Additionally, low tire pressure negatively impacts fuel efficiency, leading to higher fuel costs over time. It is essential to check the tire pressure immediately using a reliable gauge, ensuring that all tires are inflated to the recommended levels specified in the owner’s manual or on the driver’s door. If the tire pressures are correct, resetting the Tire Pressure Monitoring System (TPMS) is the next step, as a malfunctioning system can also trigger the warning light. However, if the light persists after these checks, it is crucial to consult a mechanic to diagnose any underlying issues. Promptly addressing the tire pressure light not only safeguards your safety but also prolongs the lifespan of your tires and enhances overall vehicle performance.

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