2020 Mercedes-Benz A35 AMG Tire Pressure Warning Light Stays On

Address Tire Pressure Warning Light in 2020 Mercedes-Benz A35 AMG

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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 2020 Mercedes-Benz A35 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 2020 Mercedes-Benz A35 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 persistent tire pressure warning light on a 2020 Mercedes-Benz A35 AMG?

When faced with a persistent tire pressure warning light on your 2020 Mercedes-Benz A35 AMG, 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. Next, inspect each tire for visible damage such as punctures, cuts, or bulges that could indicate a leak. 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, as this can sometimes resolve the issue. To ensure accuracy, use a tire pressure gauge to double-check the readings and make any necessary adjustments. If the warning light remains illuminated after these steps, it may indicate a malfunction with the tire pressure monitoring sensors, which would require professional diagnosis and possible replacement. By systematically addressing these areas, you can effectively troubleshoot the warning light and potentially avoid more costly repairs.

What could be causing the tire pressure warning light to stay on in a 2020 Mercedes-Benz A35 AMG?

When the tire pressure warning light stays illuminated in a 2020 Mercedes-Benz A35 AMG, it can signal several common issues that DIY enthusiasts 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 manufacturer's recommended levels can often resolve the issue. If the tire pressure is adequate, the next area to investigate is the tire pressure sensors; a malfunctioning sensor may not provide accurate readings, keeping the warning light on. Additionally, if the sensors have not been calibrated recently, they may need recalibration, which can sometimes be performed through the vehicle's onboard system. Another potential issue to consider is a leaking tire, which can be identified by inspecting for visible punctures or damage; addressing any leaks promptly is essential. Lastly, an electrical fault within the tire pressure monitoring system could also be the culprit, requiring further diagnosis. If these DIY checks do not resolve the warning light, it is advisable to consult a certified mechanic or an authorized Mercedes-Benz service center for a thorough evaluation.

What immediate steps should be taken if the tire pressure warning light remains on in a 2020 Mercedes-Benz A35 AMG?

When the tire pressure warning light remains illuminated in your 2020 Mercedes-Benz A35 AMG, it is crucial to act promptly to avoid potential safety hazards and costly repairs. Start by checking the tire pressure in all four tires with a reliable gauge, ensuring they meet the manufacturer's specifications. Underinflated tires can lead to decreased handling, increased tire wear, and even blowouts, making it essential to inflate them to the correct levels. Next, visually inspect each tire for any signs of damage, such as punctures or bulges, as these can compromise your vehicle's safety and performance. If you find any issues, consider replacing or repairing the affected tire immediately. After addressing the tire pressure and any damage, reset the tire pressure monitoring system according to your owner's manual to ensure accurate readings moving forward. If the warning light persists despite these efforts, it is advisable to consult a certified mechanic or a Mercedes-Benz service center, as neglecting this warning could lead to more severe mechanical problems and jeopardize your safety on the road. Taking these steps not only enhances your vehicle's performance but also ensures your safety and that of others while driving.

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