2020 Mercedes-Benz GLC63 AMG S Tire Pressure Warning Light Stays On

Tire Pressure Warning Light in 2020 Mercedes-Benz GLC63 AMG S: Causes and Solutions

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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 2020 Mercedes-Benz GLC63 AMG S 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 2020 Mercedes-Benz GLC63 AMG S 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 2020 Mercedes-Benz GLC63 AMG S?

To effectively diagnose the tire pressure warning light issue on your 2020 Mercedes-Benz GLC63 AMG S, begin with a thorough check of the tire pressure across all four tires using a reliable tire pressure gauge. It's crucial to compare your readings with the manufacturer's recommended levels, which can typically be found in the owner's manual or on a sticker located inside the driver's side door jamb. Next, inspect each tire for any visible signs of damage, such as punctures, cuts, or bulges, as these can lead to pressure loss and trigger the warning light. If the tire pressure is correct and no damage is found, consider resetting the tire pressure monitoring system (TPMS) according to the instructions in your vehicle's manual, as this can sometimes resolve the issue. If the warning light remains illuminated, it may indicate a malfunctioning tire pressure sensor, which would require professional diagnosis and repair at a certified Mercedes-Benz service center. Additionally, keep in mind that environmental factors, such as extreme temperature fluctuations, can impact tire pressure, so ensure that your checks are conducted under stable conditions for the most accurate results. By following this diagnostic approach, you can systematically address the tire pressure warning light issue and ensure your vehicle's safety and performance.

What could be causing the tire pressure warning light to stay on in a 2020 Mercedes-Benz GLC63 AMG S?

When the tire pressure warning light stays on in a 2020 Mercedes-Benz GLC63 AMG S, it can signal several underlying issues that DIY enthusiasts can troubleshoot. The most common reason is low tire pressure, so the first step is to check and inflate each tire to the recommended levels. If the pressure is adequate, consider the possibility of a faulty tire pressure sensor, which may need replacement if it fails to provide accurate readings. Additionally, sensor calibration issues can lead to persistent warning lights, so recalibrating the sensors might be necessary. Inspecting the tires for leaks or damage is also crucial, as any punctures can cause pressure drops that trigger the warning. In colder weather, tire pressure can decrease, making it important to adjust for temperature changes. Lastly, if all else fails, an electrical fault within the tire pressure monitoring system may be at play, necessitating professional diagnostic testing. By systematically addressing these potential issues, you can effectively troubleshoot the warning light and ensure your vehicle's safety.

What immediate actions should be taken if the tire pressure warning light remains on in a 2020 Mercedes-Benz GLC63 AMG S?

When the tire pressure warning light remains illuminated in your 2020 Mercedes-Benz GLC63 AMG S, it is crucial to act swiftly 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 found in your owner's manual or on the door jamb. If you discover any underinflated tires, promptly inflate them to the correct levels using an air compressor or a gas station pump. Additionally, visually inspect each tire for signs of damage, such as punctures or bulges, as these issues may necessitate repair or replacement. Once you have addressed the tire pressure and any visible damage, reset the tire pressure monitoring system through your vehicle's infotainment interface, following the instructions in the manual. If the warning light persists despite these efforts, it is essential to consult a certified mechanic, as there may be a deeper issue with the monitoring system that requires professional attention. Taking these steps not only ensures your safety but also helps maintain the longevity and performance of your vehicle.

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