2021 Mercedes-Benz CLS450 Tire Pressure Warning Light Stays On

Address Tire Pressure Warning Light in 2021 Mercedes-Benz CLS450: Causes and Solutions

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Reviewed by
Devin Cabugcal
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 2021 Mercedes-Benz CLS450 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 2021 Mercedes-Benz CLS450 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 are the initial steps to diagnose a tire pressure warning light that stays on in a 2021 Mercedes-Benz CLS450?

To effectively diagnose a tire pressure warning light that remains illuminated in your 2021 Mercedes-Benz CLS450, start by checking the tire pressure in all four tires, ensuring they are inflated to the manufacturer's recommended levels. Low tire pressure is a frequent culprit for this warning light. Next, inspect each tire for any visible damage, such as punctures or bulges, which could lead to air loss. If the tires appear to be in good condition, attempt to reset the tire pressure monitoring system by following the instructions in your vehicle's manual, as this can sometimes clear false warnings. Additionally, examine the tire pressure monitoring sensors on each wheel to confirm they are functioning properly and free from obstructions. If, after completing these steps, the warning light continues to stay on, it may be time to consult a qualified mechanic or dealership for a more thorough diagnosis of the tire pressure monitoring system. By following this methodical approach, you can efficiently troubleshoot the issue and potentially save on repair costs.

What could cause the tire pressure warning light to stay on in a 2021 Mercedes-Benz CLS450?

When the tire pressure warning light remains on in your 2021 Mercedes-Benz CLS450, it can be a source of concern, but understanding the common problems can help you diagnose the issue. The most frequent culprit is low tire pressure, which can easily be checked with a tire pressure gauge. If you find that the pressure is below the recommended levels, simply inflating the tires can resolve the warning light. However, if the pressure is adequate, the problem may lie with a faulty tire pressure sensor, which may require replacement. Additionally, sensor calibration issues can lead to inaccurate readings, necessitating a recalibration by a professional. Electrical malfunctions within the tire pressure monitoring system can also trigger the warning light, often requiring diagnostic testing to pinpoint the fault. Lastly, ensure that there are no electronic interferences or physical obstructions affecting the sensors, as these can disrupt their functionality. By addressing these common issues, you can ensure your vehicle's safety and performance while potentially saving on repair costs.

How urgent is it to address the tire pressure warning light on my 2021 Mercedes-Benz CLS450?

Addressing the tire pressure warning light on your 2021 Mercedes-Benz CLS450 is of utmost importance due to the immediate safety risks it poses. Ignoring this warning can lead to compromised vehicle handling and stability, increasing the likelihood of accidents. Additionally, improper tire pressure can accelerate tire wear, resulting in costly replacements and diminished fuel efficiency, which can significantly impact your overall driving expenses. The Tire Pressure Monitoring System (TPMS) is a critical feature designed to alert you to these issues, and neglecting its signals may indicate a malfunction that requires urgent attention. Following the manufacturer’s recommendations for regular tire pressure checks not only ensures your safety but also enhances the longevity and performance of your vehicle. Therefore, it is essential to take prompt action when the tire pressure warning light illuminates to avoid serious consequences and maintain optimal driving conditions.

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