2018 BMW 650i XDrive Gran Coupe Tire Pressure Warning Light Stays On

Tire Pressure Warning Light in 2018 BMW 650i xDrive Gran Coupe: 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 650i xDrive Gran Coupe 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 xDrive Gran Coupe 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 tire pressure warning light that stays on in a 2018 BMW 650i xDrive Gran Coupe?

To effectively diagnose a tire pressure warning light that remains illuminated in your 2018 BMW 650i xDrive Gran Coupe, start with the most straightforward solutions. First, check the tire pressure in all four tires, ensuring they are inflated to the manufacturer's specified levels, as low pressure is a common trigger for the warning light. Next, visually inspect each tire for any signs of damage, such as punctures or bulges, which could indicate a loss of pressure. If the tires appear to be in good condition, proceed to reset the tire pressure monitoring system following the instructions in your vehicle's manual; this can sometimes resolve the issue if it was a temporary glitch. Additionally, use a reliable tire pressure gauge to confirm the accuracy of your tire pressure readings. Lastly, don’t overlook the spare tire, as its pressure can also affect the warning system. By systematically addressing these areas, you can effectively diagnose and potentially resolve the tire pressure warning light issue on your BMW.

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

When the tire pressure warning light remains illuminated in your 2018 BMW 650i xDrive Gran Coupe, it’s essential to understand the common problems that could be at play. The most frequent culprit is low tire pressure, which can occur due to natural air loss, temperature fluctuations, or a slow leak. Start by checking the pressure in all tires using a reliable gauge, ensuring they are inflated to the manufacturer’s recommended levels. If the pressure is adequate, the issue may lie with the tire pressure sensors themselves. These sensors can malfunction or require recalibration, especially if the vehicle has recently undergone tire changes or rotations. Inspecting the sensors for any visible damage or dirt can help determine if they need cleaning or replacement. Additionally, electrical or wiring issues within the tire pressure monitoring system can also trigger the warning light. Look for any damaged wires or loose connections that could be affecting the system's functionality. By systematically addressing these potential issues, you can often resolve the warning light problem without needing professional assistance. However, if the light persists after these checks, consulting a qualified mechanic or your local BMW dealership is advisable for a thorough diagnosis.

What immediate steps should be taken to address the tire pressure warning light on a 2018 BMW 650i xDrive Gran Coupe?

When the tire pressure warning light illuminates on your 2018 BMW 650i xDrive Gran Coupe, it is crucial to act promptly to avoid potential safety hazards and costly damage. Ignoring this warning can lead to decreased vehicle handling, increased tire wear, and even tire blowouts, which pose serious risks while driving. Start by checking the tire pressure with a reliable gauge, ensuring that all tires are inflated to the manufacturer's recommended levels, typically found in the owner's manual or on a sticker inside the driver's door. If you discover any underinflated tires, inflate them immediately to the correct pressure. After adjusting the tire pressure, resetting the tire pressure monitoring system (TPMS) is essential to clear the warning light; consult your owner's manual for specific reset instructions. Additionally, inspect your tires for any visible damage, such as punctures or bulges, as these can compromise safety and performance. If the warning light remains after these steps, it is advisable to seek professional assistance from a certified BMW technician to diagnose any underlying issues. Taking these immediate actions not only ensures your safety but also helps maintain the longevity and efficiency of your vehicle.

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