2019 Mercedes-Benz SL550 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2019 Mercedes-Benz SL550

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Reviewed by
Bo Fader
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 SL550 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 SL550 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 persistent tire pressure warning light on a 2019 Mercedes-Benz SL550?

To effectively diagnose a persistent tire pressure warning light on your 2019 Mercedes-Benz SL550, start by checking the tire pressure in all four tires, ensuring they are inflated to the manufacturer's recommended levels, as low pressure is a frequent culprit for such warnings. Next, inspect each tire for any visible damage, including punctures, cuts, 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 following the instructions in your vehicle's manual; this can sometimes resolve the issue if it was triggered erroneously. If the warning light remains illuminated, it may indicate a malfunctioning tire pressure sensor, which can be assessed using a diagnostic tool. Should these initial steps not yield results, it may be time to consult a certified mechanic or dealership for a comprehensive diagnosis and repair, ensuring your vehicle is safe and roadworthy.

What could be causing the tire pressure warning light to stay on in a 2019 Mercedes-Benz SL550?

When the tire pressure warning light remains illuminated in your 2019 Mercedes-Benz SL550, it can be frustrating, but understanding the common problems can help you diagnose the issue. One of the primary culprits is low tire pressure, which is easily checked with a tire pressure gauge. Ensure all tires are inflated to the manufacturer's recommended levels, as even a slight drop can trigger the warning light. If the pressure is adequate, consider the possibility of a faulty tire pressure sensor. These sensors can malfunction, requiring either recalibration or replacement to restore proper functionality. Additionally, the sensors are powered by batteries that may deplete over time; if they are low or dead, this could also keep the warning light on. Another factor to consider is the calibration of the tire pressure monitoring system itself, which may need adjustment after tire changes or repairs. Lastly, be aware that external conditions such as extreme temperatures or rough driving conditions can affect tire pressure readings, leading to false alerts. If you've checked these common issues and the light persists, it may be time to consult a qualified mechanic or an authorized Mercedes-Benz service center for a thorough inspection.

How urgent is it to address the tire pressure warning light on a 2019 Mercedes-Benz SL550?

Addressing the tire pressure warning light on a 2019 Mercedes-Benz SL550 is of utmost urgency due to the significant safety risks and performance issues that can arise from neglecting this warning. When the tire pressure is not at the recommended levels, it can severely impact the vehicle's handling and stability, particularly in critical driving situations such as sudden stops or sharp turns. Additionally, improper tire pressure can lead to uneven tire wear, which not only shortens the lifespan of your tires but also increases the risk of a blowout while driving, posing a serious hazard to both the driver and other road users. Furthermore, maintaining correct tire pressure is essential for optimal fuel efficiency; under-inflated tires can lead to increased fuel consumption, costing you more at the pump. Lastly, the Tire Pressure Monitoring System (TPMS) is a vital component designed to alert you to tire issues, and ignoring the warning light may indicate a malfunction that requires immediate attention. Therefore, it is crucial to check and adjust your tire pressure as soon as the warning light appears to ensure your vehicle remains safe, efficient, and in good working order.

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