Last Update: September 8, 2026 | Reviewed by Continental Tire Product/Technical Specialists
The TPMS (Tire Pressure Monitoring System) warning light indicates one or more tires are significantly under-inflated, typically 25% or more below the recommended pressure, or the monitoring system itself has malfunctioned.
This guide is for vehicle owners who see the tire pressure warning light on their dashboard and need to know whether it’s safe to drive and how to resolve the issue. The most important action is checking tire pressure immediately with a quality gauge and inflating to the recommended PSI listed on your driver’s door jamb, as under-inflated tires increase the risk of tire failure and reduce fuel economy by up to 3%.
What does the tire pressure light mean?
The TPMS light means your Tire Pressure Monitoring System has detected at least one tire is significantly under-inflated (usually 25% below recommended pressure) or the system sensors have failed.
Visual Appearance
The TPMS warning light appears as a horseshoe or U-shape with an exclamation point in the center, resembling a tire cross-section viewed from the front. On most vehicles, it illuminates in yellow or amber on the instrument cluster.
What the Light Indicates
Solid light: One or more tires have pressure 25% or more below the recommended level. For a tire requiring 35 PSI, the light activates around 26 PSI or lower. This is the most common TPMS activation and indicates immediate action is needed.
Flashing light (then stays solid): The TPMS flashes for 60 to 90 seconds before staying solid indicates a system malfunction. This means the monitoring system itself has failed and cannot detect tire pressure. Possible causes include dead sensor batteries, damaged sensors, or electronic system faults.
Federal Requirement
All vehicles manufactured after September 2007 must have TPMS installed by federal law. The system is required to alert drivers when tire pressure drops significantly to prevent accidents caused by under-inflated tires, which contribute to approximately 11,000 accidents annually.
Two TPMS Types
Direct TPMS: Uses pressure sensors mounted inside each tire that measure actual air pressure and transmit data wirelessly to the vehicle computer. Provides specific pressure readings for each tire. Most common system since 2008.
Indirect TPMS: Uses wheel speed sensors from the anti-lock brake system to detect when a tire rotates faster due to smaller diameter from low pressure. Less accurate than direct systems and cannot identify which specific tire is low.
Quick Answer
- Solid light = Low tire pressure (25% below recommendation)
- Flashing then solid = System malfunction
- All vehicles 2008+ have TPMS by law
- Check pressure immediately when light appears
- Direct systems show which tire; indirect systems don’t
Why did my TPMS light come on?
The TPMS light activates due to low tire pressure from natural air loss, temperature drops, slow leaks, recent tire rotation without system reset, or sensor battery failure after 5 to 10 years.
Temperature-Related Pressure Loss
Temperature changes are the most common cause of TPMS activation. Tire pressure decreases by approximately 1 PSI for every 10°F drop in ambient temperature. A sudden cold snap from 70°F to 30°F can reduce pressure by 4 PSI, enough to trigger the TPMS warning if tires were already at the lower end of acceptable pressure. This explains why TPMS lights frequently illuminate during the first cold morning of fall or winter. The light may turn off once tires warm from driving and pressure increases, but you should still add air to compensate for the seasonal temperature drop.
Natural Air Permeation
Tires naturally lose 1 to 2 PSI per month through normal air permeation through the rubber. If you haven’t checked pressure in several months, gradual loss can accumulate to 25% below recommendation and trigger the TPMS. Continental recommends checking tire pressure monthly to prevent this scenario.
Punctures and Slow Leaks
A nail, screw, or sharp object embedded in the tread creates a slow leak that gradually reduces pressure over days or weeks. The TPMS alerts you before the tire goes completely flat. Check each tire visually for embedded objects and listen for hissing air leaks.
Fast leaks from larger punctures or sidewall damage trigger the TPMS quickly and require immediate attention to prevent tire failure.
After Tire Rotation or Replacement
Direct TPMS systems learn which sensor ID corresponds to each wheel position. After rotating tires, the system may need relearning to update sensor positions. Some vehicles perform this automatically within 10 to 50 miles of driving, while others require a manual reset procedure.
Installing new tires without TPMS sensors or damaging sensors during tire mounting also triggers the warning light.
Sensor Battery Failure
Direct TPMS sensors contain non-replaceable batteries lasting 5 to 10 years. When a sensor battery dies, that wheel can no longer transmit pressure data, triggering a system malfunction.
Spare Tire Equipped with Sensor
Some vehicles monitor spare tire pressure. If the spare is significantly under-inflated (common since spares are rarely checked), the TPMS activates even though all four road tires are properly inflated. Check spare tire pressure if the TPMS light illuminates with no obvious cause.
Signs You Need Service
- Light stays on after inflating tires to correct pressure
- Flashing light indicates system malfunction
- Light activates repeatedly within days
- One tire consistently shows low pressure (slow leak)
- Vehicle is 7+ years old (likely sensor battery failure)
How do I reset the TPMS light?
Reset the TPMS light by first inflating all tires to the recommended pressure on your door jamb sticker, then using your vehicle’s specific reset procedure which may be a dashboard button, menu setting, or drive cycle depending on the TPMS type.
Step 1: Inflate to Correct Pressure
Before attempting any reset, check and adjust tire pressure on all four tires plus the spare if monitored. Use a quality digital tire pressure gauge when tires are cold (driven less than one mile).
The correct pressure is listed on the driver’s door jamb sticker, not the maximum pressure on the tire sidewall. Inflate to the exact recommended PSI, typically 32 to 35 PSI for passenger vehicles.
If pressure is correct but the light remains on, a malfunction exists requiring professional diagnosis.
Step 2: Vehicle-Specific Reset Procedures
Dashboard reset button method (common on Toyota, Nissan, Honda models):
- Turn ignition to ON position without starting engine
- Locate TPMS reset button (usually under steering wheel or in glove box)
- Press and hold button until TPMS light blinks three times
- Release button, start engine, drive for 10 to 30 minutes
- Light should turn off after system relearns pressures
Dashboard menu method (common on Ford, GM, Chrysler models):
- Access vehicle settings through dashboard display
- Navigate to tire pressure or TPMS menu
- Select reset, relearn, or calibrate option
- Confirm reset and drive 10 to 50 miles for completion
- Consult owner’s manual for exact menu navigation
Automatic reset method (common on newer vehicles):
- Simply drive the vehicle at 50+ mph for 10 to 15 minutes
- System automatically detects correct pressures and resets
- No manual button or menu action required
- Light turns off once relearn completes
Indirect TPMS reset (older vehicles without pressure sensors):
- Access vehicle computer menu or use reset button
- Select tire calibration or TPMS reset
- System resets baseline wheel speeds with current tire pressures
- Must be done with tires at correct pressure
When Professional Service Is Required
Seek professional TPMS service if:
- Light remains on after proper inflation and reset attempts
- Flashing light indicates system malfunction
- You cannot locate reset button or menu option
- Sensor replacement is needed (7+ year old vehicle)
- Error messages appear on dashboard display
Professional TPMS service costs $50 to $150 for diagnosis and reset, or $50 to $150 per sensor for replacement including installation.
What To Do Next
Check your owner’s manual for the specific TPMS reset procedure for your vehicle make, model, and year. The manual includes exact button locations and menu navigation steps. If the manual is unavailable, contact your dealership service department or Continental authorized tire dealer for assistance.
Can I drive with the TPMS light on?
You can drive with the TPMS light on temporarily to reach a service station, but continuing to drive on significantly under-inflated tires risks tire failure, reduced vehicle control, increased stopping distance, and worse fuel economy.
Immediate Safety Risks
Tire failure risk: Under-inflated tires generate excessive heat from increased flexing of the sidewalls. At highway speeds, this heat buildup can cause tread separation, blowouts, or catastrophic tire failure.
Reduced handling: Low tire pressure reduces steering response, cornering stability, and emergency maneuver capability. The vehicle feels sluggish and less precise, particularly in wet conditions where under-inflated tires lose traction more easily.
Increased stopping distance: Under-inflated tires require more distance to stop in emergency braking situations due to reduced tire contact patch and decreased braking effectiveness.
When You Can Drive Briefly
Short-distance driving to a gas station or tire shop is acceptable if:
- Distance is under 5 miles at low speeds
- No visible tire damage or complete deflation
- You avoid highway speeds and hard braking
- Weather conditions are dry
Pull over immediately if you notice pulling, vibration, or handling changes indicating rapid air loss or tire damage.
When to Stop Driving Immediately
Do not drive if:
- Tire appears visibly flat or severely deflated
- You hear thumping or flapping from a tire
- Steering becomes extremely difficult
- TPMS light is accompanied by other warning lights
- You smell burning rubber from tire overheating
Call roadside assistance rather than risking tire failure or loss of vehicle control.
Legal Considerations
Driving with malfunctioning TPMS (flashing light indicating system failure) is not recommended. Driving with known low tire pressure creates liability if an accident occurs. Some jurisdictions may cite unsafe vehicle operation.
Important Safety Note
The TPMS exists specifically to prevent tire-related accidents. Ignoring the warning defeats this critical safety system. Check and inflate tires within 24 hours of light activation, or immediately if tire appears visibly low or vehicle handling is affected.
FAQ Section
Why does my TPMS light come on in cold weather?
Tire pressure drops 1 PSI for every 10°F temperature decrease. A 40°F overnight temperature drop can reduce pressure 4 PSI, triggering the TPMS if tires were near the lower acceptable limit. Add air to compensate for seasonal temperature changes, checking pressure monthly during fall and winter.
How much does TPMS sensor replacement cost?
TPMS sensor replacement costs $50 to $150 per sensor including parts and labor. In most cases, all four sensors need replacement around the same time since they age together. Total cost for four sensors ranges from $200 to $600. Sensors typically last 7 to 10 years before battery failure.
Will the TPMS light turn off automatically?
Yes, the TPMS light turns off automatically once all tires reach proper pressure and you drive for 10 to 30 minutes, allowing the system to verify correct pressures. Some vehicles require a manual reset procedure even after inflation. If the light stays on after driving with correct pressure, a system malfunction exists.
Can I replace TPMS sensors myself?
Replacing TPMS sensors requires tire dismounting, sensor installation, tire remounting, balancing, and electronic programming to sync with your vehicle computer. This requires professional equipment including a tire machine, wheel balancer, and TPMS programming tool. DIY replacement is not practical for most vehicle owners. Professional installation ensures proper sensor function and system programming.
What’s the difference between TPMS light and low tire pressure?
The TPMS light specifically indicates pressure has dropped 25% below recommendation, a significant under-inflation. Tires can be 5% to 20% low without triggering the TPMS. Check pressure monthly with a gauge rather than waiting for the TPMS warning, as optimal performance requires maintaining recommended pressure, not just staying above the TPMS threshold.
Do I need to replace TPMS sensors when buying new tires?
Not necessarily. TPMS sensors are transferred from old tires to new tires during installation. However, if sensors are 7+ years old, many tire shops recommend replacement during new tire installation since sensor batteries may fail soon. New valve stems and service kits are required with each tire change, costing $10 to $20 per wheel.
Why does my TPMS light come on after tire rotation?
Some TPMS systems must relearn which sensor corresponds to each wheel position after rotation. The light may illuminate briefly until the system completes automatic relearning during 10 to 50 miles of driving, or you may need to manually reset using your vehicle’s TPMS reset procedure. Consult your owner’s manual for post-rotation reset requirements.