2018 GMC Acadia Tire Pressure Warning Light Stays On

Resolve Persistent Tire Pressure Warning Light in 2018 GMC Acadia

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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 GMC Acadia 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 GMC Acadia 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.

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 GMC Acadia?

When diagnosing the tire pressure warning light issue on your 2018 GMC Acadia, it's crucial to follow a methodical approach that emphasizes simpler solutions first. Start by checking the tire pressure in all four tires, including the spare, using a reliable tire pressure gauge. Make sure each tire is inflated to the recommended levels specified in your owner's manual, as incorrect tire pressure is a frequent cause of the warning light activation. After confirming proper inflation, inspect each tire for visible damage, such as punctures, cuts, or bulges, which can lead to air loss and trigger the warning. If the tire pressure is correct and no damage is evident, proceed to reset the tire pressure monitoring system (TPMS) according to the instructions in your manual, as this can sometimes clear the warning light. Should the light persist, it may indicate a malfunctioning sensor, which would require further inspection or replacement by a professional. By systematically addressing these potential issues, you can effectively diagnose and resolve the tire pressure warning light concern, ensuring your vehicle's safety and performance on the road.

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

When the tire pressure warning light stays on in a 2018 GMC Acadia, it can signal several underlying issues that DIY enthusiasts can troubleshoot. The most common reason is low tire pressure, so the first step is to check and inflate each tire to the recommended levels. If the pressure is adequate, the next possibility is a faulty tire pressure sensor, which may need replacement if it fails to provide accurate readings. Additionally, the sensor might require recalibration, a task that can often be performed by following the vehicle's manual. Electrical or wiring problems within the tire pressure monitoring system can also cause the warning light to remain illuminated, so a thorough inspection of these components is essential. Environmental factors, such as extreme temperature fluctuations, can also impact tire pressure readings, making it important to adjust for these conditions. If these troubleshooting steps do not resolve the issue, seeking the expertise of a certified mechanic is recommended for a more detailed diagnosis.

How urgent is it to address the tire pressure warning light on a 2018 GMC Acadia that stays on?

Addressing the tire pressure warning light on a 2018 GMC Acadia is not just a matter of convenience; it is a critical safety concern that requires immediate attention. When this warning light remains illuminated, it signals that the tire pressure is either too low or there may be a malfunction in the tire pressure monitoring system. Ignoring this warning can lead to compromised vehicle handling and braking, significantly increasing the risk of accidents, particularly in challenging driving conditions. Furthermore, driving on underinflated tires accelerates uneven wear, which can necessitate costly premature tire replacements. Additionally, low tire pressure adversely affects fuel efficiency, leading to higher fuel costs over time. Most alarmingly, continued operation with insufficient tire pressure can result in tire damage or even blowouts, posing serious safety hazards for you and others on the road. Therefore, it is essential to check and adjust the tire pressure according to the manufacturer's specifications as soon as the warning light activates. If the light persists after adjustments, seeking a professional inspection is crucial to uncover any underlying issues that could jeopardize your vehicle's safety and performance.

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