2021 Mercedes-Benz GLB250 Tire Pressure Warning Light Stays On

Tire Pressure Warning Light Causes for 2021 Mercedes-Benz GLB250

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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 2021 Mercedes-Benz GLB250 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 GLB250 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 2021 Mercedes-Benz GLB250?

To effectively diagnose the tire pressure warning light issue on your 2021 Mercedes-Benz GLB250, begin with a thorough check of the tire pressure across all four tires. Utilize a reliable tire pressure gauge to ensure that each tire is inflated to the manufacturer's recommended levels, which can typically be found in your owner's manual or on a sticker located inside the driver's door jamb. Next, inspect the tires for any visible signs of damage, such as punctures, cuts, or bulges, as these can lead to air loss and trigger the warning light. If the tire pressure is correct and no damage is evident, consider resetting the tire pressure monitoring system (TPMS), as it may require recalibration after adjustments. Refer to your vehicle's manual for specific instructions on how to perform this reset. If the warning light remains illuminated despite these efforts, it may be prudent to consult a mechanic or an authorized Mercedes-Benz service center for a comprehensive diagnosis and repair. By following this diagnostic approach, you can systematically address the issue and ensure your vehicle's safety and performance.

What could be causing the tire pressure warning light to stay on in a 2021 Mercedes-Benz GLB250?

When the tire pressure warning light stays on in your 2021 Mercedes-Benz GLB250, it’s essential to identify the underlying issues to ensure your safety and vehicle performance. The most common reason for this warning light is low tire pressure, which can occur due to natural air loss or changes in temperature. Regularly checking and inflating your tires to the recommended levels is a straightforward way to address this. Another potential cause could be a faulty tire pressure sensor; if the sensor is malfunctioning, it may need to be replaced to restore accurate readings. Calibration issues can also lead to persistent warning lights, requiring a professional to recalibrate the sensors for proper functionality. Additionally, inspect your tires for any signs of damage or slow leaks, as these can contribute to low pressure and trigger the warning light. Lastly, be aware that extreme temperature fluctuations can affect tire pressure, making it crucial to monitor your tire levels during seasonal changes. By understanding and addressing these common problems, you can effectively troubleshoot the tire pressure warning light in your vehicle.

What immediate steps should be taken if the tire pressure warning light remains on in a 2021 Mercedes-Benz GLB250?

When the tire pressure warning light remains illuminated in your 2021 Mercedes-Benz GLB250, it is crucial to act promptly to avoid potential safety hazards and costly repairs. Ignoring this warning can lead to decreased vehicle performance, increased tire wear, and even tire blowouts, which pose serious risks on the road. Start by checking the tire pressure in all four tires with a reliable gauge, ensuring they meet the manufacturer's specifications. If you find any tires underinflated, inflate them to the correct levels using a dependable air compressor. Additionally, inspect each tire for visible damage, such as punctures or bulges, as these issues can compromise your safety. Once you have addressed any pressure discrepancies or damage, 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 or an authorized Mercedes-Benz service center to diagnose any underlying problems. Taking these steps not only ensures your vehicle's safety but also helps maintain its longevity and performance.

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