2021 Subaru Outback Tire Pressure Warning Light Stays On

Tire Pressure Warning Light Issues in 2021 Subaru Outback and Their 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 2021 Subaru Outback 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 2021 Subaru Outback 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 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 in my 2021 Subaru Outback?

To effectively diagnose the tire pressure warning light issue in your 2021 Subaru Outback, start with a manual check of your tire pressures using a reliable gauge. This initial step is crucial as it allows you to compare the readings against the recommended levels found in your owner's manual or on the driver's side door jamb. If you discover any tires are under-inflated, inflate them to the specified pressure, ensuring accuracy with your gauge. Next, conduct a thorough visual inspection of each tire for any signs of damage, such as punctures or bulges, which could indicate a need for repair or replacement. If you have adjusted the tire pressures, it may be necessary to reset the Tire Pressure Monitoring System (TPMS); refer to your owner's manual for specific instructions on this process. After making these adjustments, take your vehicle for a short drive to allow the system to recalibrate, which may turn off the warning light. If the light remains illuminated despite these efforts, it could signal a more complex issue with the TPMS sensors, at which point consulting a mechanic or dealership for further diagnosis is advisable. By following this structured approach, you can efficiently address the tire pressure warning light concern in your Subaru Outback.

What could cause the tire pressure warning light to remain on in a 2021 Subaru Outback?

When the tire pressure warning light remains on in your 2021 Subaru Outback, 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 is easily checked and corrected by inflating your tires to the recommended levels. If the pressure is adequate, consider the possibility of a faulty tire pressure sensor, which may require replacement if it’s not functioning correctly. Additionally, sensor calibration issues can arise, necessitating a recalibration to ensure accurate readings. Electrical faults within the tire pressure monitoring system can also lead to persistent warning lights, so inspecting the wiring and connections is crucial. Lastly, if all else fails, performing a system reset according to the manufacturer’s guidelines can often clear any erroneous alerts. By systematically addressing these potential problems, you can effectively troubleshoot and resolve the tire pressure warning light issue in your Subaru Outback.

What should I do if the tire pressure warning light stays on in my 2021 Subaru Outback?

When the tire pressure warning light remains illuminated in your 2021 Subaru Outback, it is crucial to act promptly to ensure your safety and the vehicle's performance. Ignoring this warning can lead to serious consequences, such as reduced traction, increased tire wear, and even tire blowouts, which can compromise your control of the vehicle. Start by checking the tire pressure in all tires, including the spare, using a reliable gauge to confirm they meet the recommended levels outlined in your owner's manual. If you find any tires underinflated, inflate them immediately to avoid potential hazards on the road. Additionally, inspect each tire for visible damage, as any punctures or bulges could necessitate repair or replacement. After addressing the tire pressure, resetting the tire pressure monitoring system is often required to clear the warning light; refer to your manual for specific instructions. If the light persists despite these efforts, it is essential to seek professional assistance, as ongoing issues may indicate deeper mechanical problems that could jeopardize your safety. Taking these steps not only enhances your driving experience but also safeguards you and your passengers from potential dangers associated with tire-related issues.

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