2018 BMW M240i XDrive Tire Pressure Warning Light Stays On

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

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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 BMW M240i xDrive 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 xDrive 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 on my 2018 BMW M240i xDrive?

To effectively diagnose the tire pressure warning light issue on your 2018 BMW M240i xDrive, begin with a thorough check of the tire pressure across all four tires. Utilize a reliable tire pressure gauge to ensure that each tire is inflated to the manufacturer's specified levels, which can typically be found on a sticker located inside the driver's side door jamb or within the owner's manual. Following this, inspect the tires for any visible 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 the tires appear undamaged, the next step is to reset the tire pressure monitoring system (TPMS), as it may require recalibration after adjustments. Consult your vehicle's manual for specific instructions on how to perform this reset. Should the warning light remain illuminated despite these efforts, it may indicate a malfunctioning tire pressure sensor, which could necessitate professional replacement. If you find yourself unable to resolve the issue through these steps, it is advisable to seek assistance from a certified mechanic or dealership for a comprehensive inspection and repair. By following this diagnostic approach, you can systematically address the tire pressure warning light issue and ensure your vehicle's safety and performance.

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

When the tire pressure warning light stays illuminated in your 2018 BMW M240i xDrive, 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 can occur due to natural air loss or punctures. Regularly checking and inflating your tires to the manufacturer’s recommended pressure is crucial for safety and performance. If the pressure is adequate, the problem may lie with the tire pressure monitoring system (TPMS) sensor itself, which could be malfunctioning or require recalibration. Additionally, the sensor's battery may be low or depleted, necessitating a replacement to restore proper functionality. Environmental factors, such as significant temperature fluctuations, can also impact tire pressure readings, so adjusting your tire pressure accordingly can mitigate this issue. If these steps do not resolve the warning light, it may indicate a more complex system malfunction that could require professional diagnostic testing. By being proactive and addressing these common problems, you can ensure your vehicle remains safe and performs optimally.

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

Addressing the tire pressure warning light on your 2018 BMW M240i xDrive is not just a matter of convenience; it is a pressing safety concern that requires immediate attention. Ignoring this warning can lead to dangerous driving conditions, as improper tire pressure significantly impacts your vehicle's handling and braking capabilities. Moreover, driving on underinflated tires can accelerate uneven wear, leading to costly replacements and decreased fuel efficiency, which ultimately affects your wallet. The risk of tire damage, including blowouts, increases with low tire pressure, especially when navigating high speeds or rough roads. For optimal performance, including traction and cornering stability, maintaining the correct tire pressure is essential. BMW recommends regular checks to ensure your vehicle operates safely and efficiently. Therefore, it is crucial to act promptly when the tire pressure warning light illuminates, safeguarding both your safety and the longevity of your vehicle.

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2018 BMW M240i xDrive Tire Pressure Warning Light Solutions