2018 Mercedes-Benz CLA45 AMG Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2018 Mercedes-Benz CLA45 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 2018 Mercedes-Benz CLA45 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 2018 Mercedes-Benz CLA45 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 2018 Mercedes-Benz CLA45 AMG?

To effectively diagnose a persistent tire pressure warning light on your 2018 Mercedes-Benz CLA45 AMG, start by checking the tire pressure in all four tires, ensuring they are inflated to the manufacturer's recommended levels. This is a crucial first step, as low tire pressure is a common trigger for the warning light. Next, visually inspect each tire for any signs of damage, such as punctures, cuts, or bulges, which could indicate a leak or other issues. If the tire pressure appears correct and there are no visible damages, attempt to reset the tire pressure monitoring system as outlined in your vehicle's manual; this can sometimes resolve minor glitches. For added accuracy, use a reliable tire pressure gauge to confirm the readings. If the warning light remains illuminated after these checks, it may point to a faulty tire pressure sensor, which would require replacement. Should you find yourself unable to resolve the issue through these steps, it is advisable to consult a qualified mechanic or dealership for a thorough inspection and diagnosis. By following this methodical approach, you can efficiently address the warning light and ensure your vehicle's safety on the road.

What are the common causes for the tire pressure warning light to remain on in a 2018 Mercedes-Benz CLA45 AMG?

When the tire pressure warning light stays illuminated in your 2018 Mercedes-Benz CLA45 AMG, it’s essential to understand the common problems that could be causing this issue. One of the primary culprits is low tire pressure, which can occur due to a puncture, a slow leak, or simply the natural loss of air over time. Regularly checking your tire pressure with a reliable gauge can help you identify if this is the problem. Another possibility is a faulty tire pressure sensor; if the sensor is malfunctioning, it may not provide accurate readings, leading to the warning light remaining on. Additionally, the batteries in the tire pressure sensors have a limited lifespan and may need replacement to ensure proper functionality. Lastly, if you’ve recently changed your tires or had maintenance done, the tire pressure monitoring system may require recalibration to accurately reflect the current tire pressures. By addressing these common issues, you can effectively troubleshoot and resolve the tire pressure warning light concern in your vehicle.

What immediate steps should be taken if the tire pressure warning light remains on in a 2018 Mercedes-Benz CLA45 AMG?

When the tire pressure warning light remains illuminated in your 2018 Mercedes-Benz CLA45 AMG, 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 meet the manufacturer's specifications. If you find any tires underinflated, inflate them accordingly, and if they are overinflated, release some air to achieve the correct pressure. Additionally, visually inspect each tire for any signs of damage, such as punctures or bulges, as these can compromise safety and require immediate attention. Once adjustments are made, reset the tire pressure monitoring system to clear the warning light. If the light persists despite these efforts, it is essential to consult a qualified mechanic, as there may be a deeper issue with the monitoring system that needs professional evaluation. Taking these steps not only enhances your vehicle's safety but also ensures a smoother driving experience.

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