2015 Scion XB Tire Pressure Warning Light Stays On

Common Causes for the Tire Pressure Warning Light in Your 2015 Scion xB 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 2015 Scion xB 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 Scion xB 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 the tire pressure warning light issue in my 2015 Scion xB?

To effectively diagnose the tire pressure warning light issue in your 2015 Scion xB, begin with a straightforward approach that prioritizes simple solutions before delving into more complex diagnostics. Start by checking the tire pressure in all four tires using a reliable tire pressure gauge, ensuring that the readings align with the recommended PSI found in your owner's manual or on the driver's side door jamb. Next, conduct a thorough visual inspection of each tire for any signs of damage, such as punctures or bulges, which could indicate a loss of pressure. If you find any discrepancies, adjust the tire pressure accordingly by inflating underinflated tires or releasing air from overinflated ones. After making these adjustments, it’s crucial to reset the tire pressure monitoring system, as some vehicles require this step to clear the warning light. Don’t overlook the spare tire; checking its pressure is essential since a low spare can also trigger the warning. If the light remains illuminated despite these efforts, it may signal a more serious issue with the tire pressure monitoring system itself, warranting a visit to a mechanic for professional diagnosis and repair. By following this methodical approach, you can efficiently address the tire pressure warning light issue and ensure your vehicle's safety on the road.

What could be causing the tire pressure warning light to stay on in a 2015 Scion xB?

When the tire pressure warning light stays on in a 2015 Scion xB, it’s essential to identify the underlying issues that could be causing this alert. The most common reason is low tire pressure, which can be easily resolved by checking and inflating the tires to the recommended levels. If the tire pressure is adequate, the problem might stem from a faulty tire pressure sensor that may need replacement. Additionally, sensor calibration issues can lead to incorrect readings, requiring recalibration to ensure accurate monitoring. Electrical problems, such as damaged wiring or blown fuses, can also trigger the warning light, so a comprehensive inspection of the vehicle's electrical system is advisable. Lastly, a malfunction within the tire pressure monitoring system itself could be the culprit, which may necessitate professional diagnosis and repair. By systematically addressing these potential causes, you can effectively troubleshoot and resolve the issue of the tire pressure warning light in your Scion xB.

What immediate steps should be taken if the tire pressure warning light remains on in a 2015 Scion xB?

When the tire pressure warning light remains illuminated in your 2015 Scion xB, it is crucial to act promptly to ensure your safety and the longevity of your vehicle. Ignoring this warning can lead to dangerous driving conditions, such as reduced traction and increased tire wear, which may ultimately result in a blowout or loss of control while driving. Start by checking the tire pressure in all four tires with a reliable gauge, ensuring they are inflated to the manufacturer's recommended levels. If you find any tires underinflated, use a quality air compressor to bring them up to the correct pressure. Additionally, inspect each tire for visible damage, such as punctures or bulges, as these can compromise your safety. After addressing any pressure or damage issues, reset the tire pressure monitoring system according to your owner's manual. If the warning light persists, it is essential to consult a qualified mechanic, as there may be a deeper issue with the monitoring system that requires professional attention. Taking these steps not only enhances your safety but also helps prevent costly repairs down the line.

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