2018 Cadillac CTS Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2018 Cadillac CTS for Safe Driving

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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 2018 Cadillac CTS 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 CTS 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 in my 2018 Cadillac CTS?

To effectively diagnose the tire pressure warning light issue in your 2018 Cadillac CTS, 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 that the readings align with the recommended PSI found in your owner's manual or on the driver's side door jamb. Next, inspect each tire for any visible damage, such as punctures or bulges, which could indicate a leak. If you find any discrepancies in tire pressure, adjust accordingly by adding air to underinflated tires or releasing air from overinflated ones. After making these adjustments, consult your owner's manual to determine if a manual reset of the tire pressure monitoring system (TPMS) is necessary. Additionally, remember to check the spare tire, as it can also trigger the warning light if its pressure is low. If the warning light remains illuminated despite these efforts, it may signal a more serious issue with the TPMS sensors or system, at which point seeking assistance from a qualified mechanic or dealership is advisable for further diagnosis and repair. By following this methodical approach, you can efficiently address the tire pressure warning light issue in your Cadillac CTS.

What could be causing the tire pressure warning light to remain on in a 2018 Cadillac CTS?

When the tire pressure warning light remains on in a 2018 Cadillac CTS, it can be a source of concern for any DIY car owner. The most frequent culprit is low tire pressure, which can easily be checked with a tire pressure gauge. Ensuring that all tires are inflated to the manufacturer's recommended levels is a straightforward first step. If the pressure is adequate and the light persists, the issue may lie with a faulty tire pressure sensor. These sensors can malfunction over time, and replacing them may be necessary to restore proper functionality. Additionally, the sensors are equipped with batteries that can deplete, leading to the warning light staying on; replacing these batteries can often resolve the issue. Calibration of the sensors is another important aspect to consider, as they may require recalibration to accurately reflect tire pressure readings. Lastly, electrical issues within the tire pressure monitoring system or the vehicle's broader electrical system can also trigger the warning light. If basic checks do not resolve the problem, it may be wise to consult a professional mechanic for a thorough diagnosis, ensuring that your vehicle remains safe and performs optimally.

How urgent is it to address the tire pressure warning light on my 2018 Cadillac CTS?

Addressing the tire pressure warning light on your 2018 Cadillac CTS is not just a matter of convenience; it is a critical safety concern that requires immediate attention. Ignoring this warning can lead to dangerous driving conditions, including reduced traction and an increased likelihood of tire blowouts, particularly in challenging weather or at high speeds. Furthermore, improper tire pressure can accelerate tire wear and diminish fuel efficiency, resulting in higher costs over time. Maintaining the correct tire pressure is essential for optimal vehicle performance, affecting everything from braking to handling. By promptly addressing the tire pressure warning light, you not only enhance your safety on the road but also protect your vehicle from potential damage to tires, wheels, and suspension components, ultimately saving you from costly repairs in the future.

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