2019 Mercedes-Benz GLC300 Tire Pressure Warning Light Stays On

Resolve Persistent Tire Pressure Warning Light in 2019 Mercedes-Benz GLC300

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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 2019 Mercedes-Benz GLC300 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 2019 Mercedes-Benz GLC300 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 2019 Mercedes-Benz GLC300?

When diagnosing the tire pressure warning light issue on your 2019 Mercedes-Benz GLC300, it's essential to adopt a systematic approach that prioritizes simpler solutions before delving into more complex diagnostics. Begin by checking the tire pressure in all four tires with a reliable tire pressure gauge, ensuring they meet the manufacturer's recommended levels, which can typically be found on a sticker inside the driver's door jamb or in the owner's manual. Next, visually inspect each tire for any signs of damage, such as punctures or bulges, as these could be the root cause of pressure loss. If the tire pressure is correct and the tires appear undamaged, proceed to reset the tire pressure monitoring system (TPMS) according to your vehicle's manual, as this can sometimes resolve the warning light issue. If the light remains illuminated, it may indicate a malfunctioning tire pressure sensor, which would require professional assessment and potential replacement. Should you find yourself unable to resolve the issue through these steps, visiting a certified mechanic or dealership is advisable, as they possess the necessary tools and expertise to diagnose and address any underlying problems effectively. By following this structured diagnostic approach, you can efficiently identify and rectify the cause of the tire pressure warning light on your GLC300.

What could be causing the tire pressure warning light to stay on in a 2019 Mercedes-Benz GLC300?

When the tire pressure warning light stays on in a 2019 Mercedes-Benz GLC300, it can signal several common issues that DIYers can address. The most frequent cause is low tire pressure, so the first step is to check and inflate your tires to the recommended levels. If the pressure is adequate, the problem may lie with a faulty tire pressure sensor, which could require replacement or recalibration. Additionally, consider the possibility of low sensor batteries, as this can lead to inaccurate readings. Inspecting the wiring and connections for any damage or loose connections is also essential, as these can interfere with the tire pressure monitoring system. Environmental factors, such as extreme temperature changes, can also impact tire pressure, so checking your tires when they are cold is advisable. If these steps do not resolve the issue, the system may need recalibration, which is best handled by a qualified technician. By being aware of these potential problems, you can effectively troubleshoot the tire pressure warning light and maintain your vehicle's safety.

What immediate steps should be taken if the tire pressure warning light remains on in a 2019 Mercedes-Benz GLC300?

When the tire pressure warning light remains illuminated in your 2019 Mercedes-Benz GLC300, 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 are inflated to the manufacturer's recommended levels. If you find any tires underinflated, use a quality air compressor to bring them up to the correct pressure. Additionally, inspect each tire for visible damage, such as punctures or bulges, as these can compromise safety and necessitate tire replacement. Once you have addressed any pressure discrepancies or damage, reset the tire pressure monitoring system according to your owner's manual instructions. If the warning light persists despite these efforts, it is essential to consult a qualified mechanic or a Mercedes-Benz service center to prevent further complications. Taking these immediate steps not only enhances your vehicle's safety but also ensures a smoother driving experience.

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