2018 Hyundai Sonata Tire Pressure Warning Light Stays On

Tire Pressure Warning Light in 2018 Hyundai Sonata: Causes and Solutions

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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 2018 Hyundai Sonata 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 2018 Hyundai Sonata 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 on my 2018 Hyundai Sonata?

To effectively diagnose the tire pressure warning light issue on your 2018 Hyundai Sonata, begin with a straightforward approach that prioritizes simpler solutions before delving into more complex diagnostics. Start by checking the tire pressure in all four tires using a reliable tire pressure gauge, ensuring they are inflated to the levels recommended in your vehicle's manual. This initial step can often resolve the warning light if the pressure is simply low. Next, inspect the tires for any visible damage, such as punctures or bulges, which could also trigger the warning light. If the tires appear to be in good condition, consider resetting the tire pressure monitoring system (TPMS) as outlined in your vehicle's manual, as this can sometimes clear false warnings. Additionally, examine the TPMS sensors on each tire to confirm they are functioning correctly and free from damage. If, after these steps, the warning light remains illuminated, it may be time to consult a mechanic or visit a Hyundai service center for a comprehensive 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 cause the tire pressure warning light to stay on in a 2018 Hyundai Sonata?

When the tire pressure warning light remains illuminated in a 2018 Hyundai Sonata, it can be attributed to several common problems that DIYers can investigate. The most frequent culprit is low tire pressure, which can easily be checked using a tire pressure gauge. Ensuring that all tires are inflated to the manufacturer's recommended levels is crucial for both safety and performance. If the tire pressure is adequate, the next step is to consider the possibility of a faulty tire pressure sensor. These sensors can malfunction or may require a battery replacement, as they are powered by small batteries that can deplete over time. Additionally, if the sensor is functioning but still showing incorrect readings, it may need recalibration or replacement. Electrical issues, such as wiring problems or control module failures, can also trigger the warning light, making it essential to inspect the vehicle's electrical system. By systematically addressing these potential issues, DIY enthusiasts can effectively diagnose and resolve the tire pressure warning light problem, ensuring a safer driving experience.

How urgent is it to address the tire pressure warning light that stays on in a 2018 Hyundai Sonata?

Addressing the tire pressure warning light that remains illuminated in a 2018 Hyundai Sonata is of utmost importance due to the significant safety risks and potential vehicle performance issues it presents. Ignoring this warning can lead to compromised handling and stability, particularly in emergency situations or adverse weather conditions, increasing the likelihood of accidents. Additionally, driving on underinflated tires can severely affect fuel efficiency, leading to higher fuel costs and accelerated tire wear, which may necessitate premature replacement. Furthermore, a persistent warning light could signal underlying mechanical problems with the tire pressure monitoring system or the tires themselves, which, if left unchecked, could result in costly repairs. Therefore, it is crucial to promptly check and adjust tire pressures to the recommended levels and consult a qualified mechanic if the warning light does not turn off, ensuring both safety and optimal vehicle performance.

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