The Tire Pressure Monitoring System — commonly called TPMS — has been required on all new passenger vehicles sold in the United States since 2008. Its purpose is straightforward: to warn you when one or more of your tires drops significantly below the recommended pressure. Despite being on virtually every vehicle on Denver's roads, TPMS is one of the least understood safety systems in modern cars.
In Colorado's climate, where temperatures can swing 40°F or more between night and day, and where altitude affects air density, TPMS warnings are more common than in most states. Understanding what your TPMS is telling you — and responding correctly — is an important part of safe driving in the Denver metro area.
How TPMS Works
There are two types of TPMS systems found in modern vehicles:
Direct TPMS uses a pressure sensor mounted inside each wheel that transmits real-time pressure data to your vehicle's computer. This is the more accurate and more common system in newer vehicles. When pressure in any tire drops 25% or more below the recommended level, the warning light activates.
Indirect TPMS doesn't use pressure sensors — instead it monitors wheel rotation speeds using your vehicle's ABS sensors. An underinflated tire has a slightly smaller diameter and rotates faster than a properly inflated tire. When the system detects this difference, it triggers the warning light. Indirect TPMS is less precise and requires recalibration after tire rotations and pressure adjustments.
Denver Specific: Colorado's dramatic temperature swings make TPMS warnings especially common. For every 10°F drop in temperature, tire pressure falls approximately 1 PSI. A cold Denver morning after a warm afternoon can easily trigger your TPMS light — even if your tires were perfectly inflated the day before.
What the TPMS Warning Light Means
The TPMS warning light looks like a cross-section of a tire with an exclamation point inside. How it behaves tells you a lot about what's happening:
- Solid light — one or more tires is 25% or more below the recommended pressure. Check all four tires with a gauge and inflate to the correct pressure. The light should go off once pressure is restored and the vehicle is driven briefly.
- Flashing light (60-90 seconds then solid) — this indicates a TPMS sensor malfunction, not necessarily a pressure problem. One or more sensors may have a dead battery, been damaged, or lost communication with the vehicle's computer. This requires professional diagnosis.
- Light stays on after inflating tires — the system may need to be reset, or a sensor may be faulty. Bring the vehicle in for a TPMS check.
- Light comes on after tire rotation or new tires — the system may need recalibration. This is common and easily corrected.
TPMS Light On in Denver?
Denver CO Tire Shop diagnoses and services TPMS systems same day. Don't ignore that warning light.
TPMS Maintenance — What Denver Drivers Need to Know
TPMS sensors are battery-powered devices mounted inside your wheels. Most sensor batteries last 5-10 years, after which the sensor must be replaced. When you get new tires installed, the sensors should be inspected, and service kits (valve cores, caps, and grommets) should be replaced to prevent air leaks. This is standard procedure at a professional tire installation shop.
Key TPMS maintenance points for Denver drivers:
- Don't ignore the warning light — even if you think it's just a cold morning pressure drop, confirm it by checking all four tires manually. A TPMS warning that persists after temperatures warm up indicates a real problem.
- Check sensors when getting new tires — new tires are the right time to inspect sensor condition and battery life. Replacing a sensor after the tire is already mounted costs more than doing it during installation.
- Recalibrate after pressure adjustments — if you have an indirect TPMS system, it may need to be reset after inflating or rotating tires. Your owner's manual will explain the reset procedure for your specific vehicle.
- Winter tire sets need sensors too — if you run a dedicated set of winter wheels and tires in Colorado, each wheel needs its own TPMS sensor or your warning light will stay on all winter. We can install sensors on your winter set during the seasonal swap.