2021 Mercedes-Benz GLA35 AMG Tire Pressure Warning Light Stays On

Address Tire Pressure Warning Light in 2021 Mercedes-Benz GLA35 AMG for Optimal Tire Health

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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 2021 Mercedes-Benz GLA35 AMG 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 GLA35 AMG 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 tire pressure warning light that stays on in a 2021 Mercedes-Benz GLA35 AMG?

When faced with a tire pressure warning light that remains illuminated in your 2021 Mercedes-Benz GLA35 AMG, it's essential to adopt a systematic diagnostic approach. Begin by manually checking the tire pressure in all four tires, including the spare, to ensure they meet the manufacturer's recommended levels. This information is typically found in the owner's manual or on a sticker located inside the driver's door jamb. Next, inspect each tire for any visible damage, such as cuts, punctures, or bulges, as these can lead to pressure loss and trigger the warning light. If the tire pressures are correct and the tires appear undamaged, proceed to reset the Tire Pressure Monitoring System (TPMS) according to the instructions in your vehicle's manual. Sometimes, a simple reset can resolve the issue. Additionally, consider driving the vehicle for a short distance, as this can help recalibrate the TPMS sensors. If the warning light persists after these steps, it may indicate a malfunction in the TPMS sensors themselves, which could require further investigation or replacement. By following this methodical approach, you can effectively diagnose and address the tire pressure warning light issue in your GLA35 AMG, ensuring a safer driving experience.

What could be causing the tire pressure warning light to remain on in a 2021 Mercedes-Benz GLA35 AMG?

When the tire pressure warning light remains on in your 2021 Mercedes-Benz GLA35 AMG, it’s crucial to understand the common problems that could be causing this issue. One of the primary culprits is low tire pressure, which can easily be checked with a tire pressure gauge. Ensure that 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 or require recalibration, which may necessitate replacement. Additionally, some sensors are battery-operated, and if the batteries are low or dead, this could also keep the warning light illuminated. Another factor to consider is the wiring connected to the tire pressure monitoring system; any faults here can lead to persistent alerts. Lastly, remember that temperature fluctuations can impact tire pressure readings, so it’s best to check your tires when they are cold for the most accurate results. Addressing these issues promptly not only ensures your safety but also maintains the performance of your vehicle. If you’re unable to resolve the problem through these DIY methods, consulting a certified mechanic is advisable for a thorough diagnosis.

What should I do if the tire pressure warning light stays on in my 2021 Mercedes-Benz GLA35 AMG?

When the tire pressure warning light remains illuminated in your 2021 Mercedes-Benz GLA35 AMG, it is crucial to act swiftly to avoid serious safety risks and vehicle damage. First, check the tire pressure in all four tires using a reliable tire pressure gauge, ensuring they meet the manufacturer's recommended levels. If you find any tire underinflated, inflate it to the correct pressure as specified in your owner's manual or on the driver's side door jamb. After adjusting the tire pressures, take your vehicle for a short drive; this allows the tire pressure monitoring system (TPMS) to recalibrate and potentially turn off the warning light. However, if the light persists, it may indicate a malfunction in the TPMS sensors, necessitating a visit to a qualified mechanic or an authorized Mercedes-Benz service center. Ignoring this warning can lead to decreased fuel efficiency, uneven tire wear, and compromised handling, making it essential to address the issue promptly for your safety and the longevity of your vehicle.

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2021 Mercedes-Benz GLA35 AMG Tire Pressure Light Issues