A flashing tire pressure monitoring system (TPMS) light on your Subaru is a serious issue demanding immediate attention. Unlike a steadily illuminated light indicating low tire pressure, a flashing light signifies a malfunction in the TPMS itself, not just low pressure. Ignoring this warning can compromise your safety and handling. This comprehensive guide will explore the common causes of a flashing TPMS light in Subarus and provide practical troubleshooting steps.
Understanding Your Subaru's TPMS
Before diving into troubleshooting, it's crucial to understand how your Subaru's TPMS works. The system uses sensors embedded in each tire to monitor pressure and temperature. These sensors wirelessly transmit data to the vehicle's onboard computer. A flashing light indicates a problem with either the sensors, the system's communication, or a severe pressure issue requiring immediate action.
Common Reasons for a Flashing Tire Pressure Light in Subarus
Several factors can trigger a flashing TPMS light. Let's examine the most frequent culprits:
1. Sensor Malfunction:
- Battery Failure: TPMS sensors are battery-powered, and these batteries have a limited lifespan (typically 5-7 years). A dead battery will prevent the sensor from transmitting data, leading to a flashing light.
- Sensor Damage: Impact from potholes, curbs, or other road hazards can damage the sensors, rendering them non-functional.
- Sensor Faults: Sometimes, a sensor may malfunction without any visible damage. This might be due to internal electronic issues.
2. System Communication Issues:
- Receiver Problems: The receiver unit in your Subaru that interprets signals from the sensors can malfunction, preventing the system from correctly reading data.
- Wiring Problems: Damaged or loose wiring between the sensors and the receiver can disrupt communication.
3. Severe Tire Pressure Issues:
While a steady light usually indicates low tire pressure, a rapidly flashing light often signals a significant pressure loss in one or more tires – potentially a puncture or complete deflation. This is a critical safety concern.
4. Faulty TPMS Module:
In rare cases, the TPMS module itself might be defective. This requires professional diagnosis and replacement.
Troubleshooting Your Flashing Tire Pressure Light
Here’s a step-by-step guide to address the issue:
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Immediate Action: Pull over safely to a stable location as soon as possible. Check your tires visually for any obvious damage, punctures, or significant deflation. If you find a flat tire, change it immediately using your spare.
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Check Tire Pressure: Use a reliable tire pressure gauge to check the pressure in each tire. Inflate any tires that are low to the recommended pressure (found in your owner's manual or on a sticker inside the driver's side door jamb).
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Reset the TPMS (if applicable): Some Subarus allow you to reset the TPMS system after inflating the tires. Consult your owner’s manual for the specific procedure for your model year. Often, this involves driving for a short distance at a moderate speed.
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Monitor the Light: After inflating tires and potentially resetting, drive for a short distance. If the light remains flashing, the problem is likely more serious than low tire pressure.
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Professional Diagnosis: If the flashing light persists despite checking tire pressure and attempting a reset, you need to take your Subaru to a qualified mechanic or Subaru dealership. They have the diagnostic tools to pinpoint the specific cause of the malfunction (faulty sensor, wiring issues, etc.).
Preventing Future TPMS Issues
Regular maintenance can help prevent future TPMS problems:
- Regular Tire Pressure Checks: Check your tire pressure at least once a month, and before long trips.
- Tire Rotation: Rotate your tires regularly according to your owner’s manual recommendations to ensure even wear and tear.
- Visual Tire Inspections: Regularly inspect your tires for cuts, bulges, or embedded objects.
A flashing tire pressure light on your Subaru is not something to ignore. Addressing the issue promptly ensures your safety and the longevity of your vehicle's TPMS system. Remember to always prioritize safety and consult a professional if you are unsure about any aspect of the troubleshooting process.
