2018 Cadillac XTS Tire Pressure Warning Light Stays On

Common Causes for the Tire Pressure Warning Light in Your 2018 Cadillac XTS and How to Resolve Them

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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 2018 Cadillac XTS 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 Cadillac XTS 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.

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 Cadillac XTS?

To effectively diagnose the tire pressure warning light issue on your 2018 Cadillac XTS, begin by checking the tire pressure in all four tires using a reliable tire pressure gauge. Ensure that each tire is inflated to the recommended levels specified in your vehicle's manual, as incorrect pressure is a common trigger for the warning light. Next, visually inspect the tires for any signs of damage, such as punctures, cuts, or bulges, which could indicate a leak or other issues. If the tire pressure is correct and the tires appear undamaged, proceed to reset the tire pressure monitoring system (TPMS) according to the instructions in your vehicle's manual, as sometimes the system may simply need a refresh. Additionally, examine the TPMS sensors on each tire to confirm they are functioning properly, as faulty sensors can also cause the warning light to activate. If these steps do not resolve the issue, it may be necessary to consult a professional mechanic or dealership for a thorough inspection and diagnosis, ensuring that your vehicle remains safe and roadworthy.

What could cause the tire pressure warning light to stay on in a 2018 Cadillac XTS?

When the tire pressure warning light stays on in a 2018 Cadillac XTS, it signals potential issues that need to be addressed for safe driving. The most common culprit is low tire pressure, which can occur due to punctures, leaks, or simply the natural loss of air over time. Regularly checking and maintaining the recommended tire pressure is crucial for vehicle performance and safety. Another possibility is a faulty tire pressure sensor; if the sensor is malfunctioning, it may not provide accurate readings, causing the warning light to remain illuminated. Calibration issues can also play a role, as sensors may require resetting to ensure they accurately reflect tire pressure levels. Additionally, electrical or wiring problems within the tire pressure monitoring system can disrupt communication between the sensors and the vehicle, triggering the warning light. To troubleshoot this issue effectively, begin by checking and inflating the tires to the correct pressure, inspecting for any visible damage, and if the problem persists, consider having the sensors and electrical system evaluated by a professional. By addressing these common problems, you can help ensure that your Cadillac XTS operates safely and efficiently.

How urgent is it to address the tire pressure warning light on a 2018 Cadillac XTS that stays on?

Addressing the tire pressure warning light on a 2018 Cadillac XTS is of utmost urgency due to the significant safety risks and potential vehicle damage associated with low tire pressure. When this warning light remains illuminated, it indicates that one or more tires may be underinflated, which can severely compromise the vehicle's handling and braking capabilities. This is particularly dangerous in adverse weather conditions, where the risk of accidents increases dramatically. Additionally, neglecting this warning can lead to uneven tire wear, resulting in premature tire replacement, which not only incurs additional costs but also affects overall driving comfort. Furthermore, underinflated tires can decrease fuel efficiency, leading to higher fuel expenses over time. Lastly, continued driving with low tire pressure can cause irreversible damage to the tires, increasing the likelihood of a blowout while on the road. Therefore, it is crucial to take immediate action when the tire pressure warning light is on to ensure both your safety and the longevity of your vehicle.

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