2018 BMW M240i Tire Pressure Warning Light Stays On

Tire Pressure Warning Light in 2018 BMW M240i: Causes and Solutions

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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 2018 BMW M240i 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 BMW M240i 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 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 in my 2018 BMW M240i?

To effectively diagnose the tire pressure warning light issue in your 2018 BMW M240i, begin with a straightforward approach by checking the tire pressure in all four tires using a reliable tire pressure gauge. Ensure that the readings align with the manufacturer's recommended levels, which can typically be found in your owner's manual or on a sticker located inside the driver's door jamb. Next, visually inspect each tire for any signs of damage, such as punctures, cuts, or bulges, as these can lead to pressure loss and trigger the warning light. If the tire pressure is correct and no visible damage is found, consider resetting the tire pressure monitoring system (TPMS) according to the instructions in your vehicle's manual, as this can sometimes resolve minor glitches. If the warning light remains illuminated, it may indicate a malfunctioning tire pressure sensor, which would require inspection and potential replacement by a qualified technician. Should you find yourself unable to diagnose or fix the issue, seeking assistance from a certified mechanic or dealership is advisable for a thorough evaluation and professional support. By following this diagnostic approach, you can systematically address the tire pressure warning light issue and ensure your BMW M240i is safe and roadworthy.

What could be causing the tire pressure warning light to stay on in a 2018 BMW M240i?

When the tire pressure warning light remains illuminated in a 2018 BMW M240i, it can be attributed to several common problems that DIYers can investigate. The first step is to check the tire pressure in all four tires, as low pressure is the most frequent culprit. Ensure that each tire is inflated to the manufacturer's recommended levels, which can usually be found on a sticker inside the driver’s door. If the pressure is adequate, the next potential issue could be a faulty tire pressure sensor. These sensors can malfunction over time, and if they are not functioning correctly, they may need replacement. Additionally, it’s important to consider whether the sensors require recalibration, especially if tires have been recently changed or rotated. Inspecting the tires for any visible leaks or punctures is also crucial, as a slow leak can lead to a drop in pressure that triggers the warning light. Lastly, if all else checks out, there may be an underlying electrical issue within the tire pressure monitoring system that necessitates diagnostic testing. Addressing these issues promptly not only ensures the safety of your vehicle but also enhances its overall performance.

How urgent is it to address the tire pressure warning light on a 2018 BMW M240i?

When the tire pressure warning light illuminates on your 2018 BMW M240i, it is essential to act swiftly to avoid serious safety risks and vehicle damage. Ignoring this warning can lead to compromised handling and stability, particularly in critical driving situations, which could endanger both you and other road users. Additionally, driving on improperly inflated tires can accelerate uneven wear, significantly shortening their lifespan and increasing the likelihood of a blowout. This not only poses a safety hazard but can also lead to costly replacements. Furthermore, maintaining the correct tire pressure is vital for optimal fuel efficiency; neglecting this aspect can result in higher fuel consumption, impacting your overall driving costs. Lastly, the Tire Pressure Monitoring System (TPMS) is a crucial feature designed to alert you to tire issues, and ignoring the warning light may indicate a malfunction that requires immediate attention. Therefore, addressing the tire pressure warning light without delay is not just a matter of convenience; it is a critical step in ensuring your vehicle's safety, performance, and longevity.

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