2019 Mercedes-Benz GLS450 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2019 Mercedes-Benz GLS450

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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 2019 Mercedes-Benz GLS450 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 GLS450 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 GLS450?

When diagnosing the tire pressure warning light issue on your 2019 Mercedes-Benz GLS450, it's essential to adopt a systematic approach that begins with the simplest solutions. Start by checking the tire pressure in all four tires using a reliable tire pressure gauge, ensuring that the readings align with the manufacturer's recommended levels found in your owner's manual or on the sticker located inside the driver's door jamb. Next, conduct a thorough visual inspection of each tire for any signs of damage, such as punctures, cuts, or bulges, as these can trigger the warning light. Additionally, look for potential leaks by examining the tires and valve stems; a mixture of soap and water can help reveal leaks, as bubbles will form where air escapes. If you've corrected the tire pressure and inspected for damage but the warning light remains illuminated, consult your owner's manual for instructions on resetting the tire pressure monitoring system (TPMS). Should the issue persist despite these efforts, it may be prudent to seek assistance from a qualified mechanic or an authorized Mercedes-Benz service center for a comprehensive diagnosis and repair. By following this diagnostic approach, you can effectively 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 remain on in a 2019 Mercedes-Benz GLS450?

When the tire pressure warning light stays on in a 2019 Mercedes-Benz GLS450, it can signal several common issues that DIYers can troubleshoot. The first step is to check the tire pressure in all four tires, as low pressure is the most frequent cause of the warning light. Ensuring that each tire is inflated to the recommended levels can often resolve the issue quickly. If the tire pressure is adequate, the next potential problem could be a faulty tire pressure sensor, which may require replacement or recalibration. Additionally, the sensors are equipped with batteries that can wear out, so checking for dead batteries is crucial. Inspecting the wiring and connections related to the tire pressure monitoring system is also important, as any damage or loose connections can trigger the warning light. Lastly, if all other checks are satisfactory, the system may need recalibration to ensure it provides accurate readings. By addressing these issues promptly, you can enhance your vehicle's safety and performance while preventing future occurrences of the warning light. Regular monitoring of tire pressure is a proactive measure that can help maintain optimal tire health.

What immediate steps should be taken to address the tire pressure warning light on a 2019 Mercedes-Benz GLS450?

When the tire pressure warning light illuminates on your 2019 Mercedes-Benz GLS450, it is crucial to act promptly to avoid potential safety hazards and costly repairs. Ignoring this warning can lead to decreased vehicle handling, increased tire wear, and even tire blowouts, which pose serious risks while driving. Start by checking the tire pressure of all four tires with a reliable gauge, ensuring they meet the manufacturer's specifications found in the owner's manual or on the door jamb. If you discover any tires are underinflated, use an air compressor to bring them up to the correct pressure. After inflating, resetting the tire pressure monitoring system (TPMS) is essential to clear the warning light; consult your owner's manual for specific reset instructions. Additionally, inspect the tires for any visible damage, such as punctures or bulges, as these can exacerbate the issue. If the warning light remains illuminated despite these efforts, it is advisable to seek professional assistance to diagnose any underlying problems with the TPMS or the tires themselves. Taking these immediate steps not only ensures your safety but also helps maintain the longevity and performance of your vehicle.

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