2018 BMW 650i Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2018 BMW 650i for Optimal Tire Performance

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Reviewed by
Andrew Hajjar
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 650i 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 650i 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 are the initial steps to diagnose a persistent tire pressure warning light on a 2018 BMW 650i?

To effectively diagnose a persistent tire pressure warning light on your 2018 BMW 650i, 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 any visible damage, such as punctures or bulges, which 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; this can sometimes resolve the issue if it is a minor glitch. Additionally, examine the tire pressure sensors for any signs of malfunction or damage, as faulty sensors can trigger the warning light. If, after completing these steps, the warning light remains illuminated, it may be time to consult a qualified mechanic or a BMW dealership for a thorough diagnosis and repair. By following this methodical approach, you can efficiently troubleshoot the problem and determine whether it can be resolved through DIY efforts or requires professional intervention.

What could cause the tire pressure warning light to stay on in a 2018 BMW 650i?

When the tire pressure warning light stays on in a 2018 BMW 650i, it can signal several common issues that DIY enthusiasts can address. Start by checking the tire pressure in all four tires, as low pressure is often the primary cause. Ensure each tire is inflated to the recommended levels specified in the owner's manual, since temperature changes or slow leaks can lead to air loss. If the tire pressure is adequate, the next step is to inspect the tire pressure sensors, which may malfunction or become faulty over time, preventing accurate pressure detection. Look for any visible damage or wear on the sensors. Additionally, if the sensors are not calibrated correctly, they can trigger the warning light even when tire pressure is normal, so recalibration may be necessary, which typically requires a visit to a certified BMW service center. If the warning light remains illuminated after checking the tires and sensors, it could indicate electrical issues, such as wiring problems or a blown fuse, which would need professional diagnosis. By methodically addressing these potential causes, you can effectively troubleshoot and resolve the tire pressure warning light issue in your BMW 650i.

How urgent is it to address the tire pressure warning light that stays on in a 2018 BMW 650i?

Addressing the tire pressure warning light that remains illuminated in a 2018 BMW 650i is of utmost importance due to the immediate safety risks it poses. Low tire pressure can significantly impair vehicle handling and braking, increasing the likelihood of accidents. Furthermore, neglecting this warning can lead to uneven tire wear, which not only shortens the lifespan of your tires but also raises the risk of a blowout while driving, potentially resulting in serious injury. Additionally, underinflated tires can negatively impact fuel efficiency, leading to higher fuel costs over time. The Tire Pressure Monitoring System (TPMS) is designed to alert drivers to critical changes in tire pressure, and ignoring this warning could indicate a malfunction that requires professional attention. Therefore, it is crucial to check and maintain proper tire pressure promptly to ensure safe driving, prolong tire life, and avoid unnecessary expenses.

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