Cold Tire Pressure: Read the Door Placard Before Resetting TPMS
Start a tire-pressure check with your vehicle’s placard and a gauge. A warning light and the number moulded on the tire sidewall are not substitutes for the vehicle’s recommended cold pressure. Do not use a universal PSI value from a different car.
This is a basic measurement and record-keeping guide, not a diagnosis of a damaged tire. If there is visible damage, a rapid loss of pressure or unusual handling, arrange professional help rather than relying on a reset.
1. Find the vehicle recommendation
NHTSA advises checking tire pressure monthly and using the vehicle manufacturer’s recommended pressure, found on the tire-information placard or in the owner’s manual. Its guidance distinguishes that recommendation from the pressure marking on the tire itself.
Write down the front and rear recommendations separately if they differ. Also note the units: PSI and kPa are different scales. When comparing a gauge with a placard, use matching units. Follow any vehicle-specific instructions for load conditions; do not invent an adjustment from another model.
Read NHTSA’s tire-pressure and TPMS guidance2. Measure under comparable conditions
For an accurate reading, the tires should be cold. NHTSA describes this as the car not having been driven for at least three hours. Driving warms the tire and affects the reading. Do not bleed air out of a warm tire just to force it down to a cold target.
A useful monthly record uses the same gauge, a comparable parked condition and all four tires. Include the spare if your vehicle has one and its manual calls for a pressure check. This makes the record easier to compare; it does not guarantee that a gauge is calibrated.
| Position | Placard target | Gauge reading | Follow-up |
|---|---|---|---|
| Front left | ___ / unit ___ | ___ | ___ |
| Front right | ___ / unit ___ | ___ | ___ |
| Rear left | ___ / unit ___ | ___ | ___ |
| Rear right | ___ / unit ___ | ___ | ___ |
3. Read the TPMS warning before clearing it
NHTSA explains that TPMS warns when a tire is significantly underinflated; it does not replace a monthly gauge check. A lamp that flashes for roughly 60–90 seconds and then stays on may indicate a system malfunction. Consult the vehicle manual for its exact meaning and response.
Record whether the light was steady immediately or flashed first. That observation is useful information for a repair shop. A reset is not evidence that a puncture has been repaired or that the pressures are correct.
If one tire repeatedly loses pressure while the others remain stable under similar conditions, record the dates and readings and have the tire checked. Do not try to establish a safe leak rate from this article.
4. Keep a short service note
Before an appointment, gather the vehicle model, tire size, placard recommendations, cold readings and warning-light behaviour. Add any recent tire replacement or wheel service. Keep personal information and the full vehicle identification number out of public posts when sharing a question online.
Can I use the sidewall maximum as my target?
Use the vehicle placard and manual for the recommended pressure. The tire’s marking answers a different question.
Is a dark TPMS lamp proof that pressure is perfect?
No. Use the gauge and vehicle recommendation. TPMS is a warning system, not a monthly maintenance record.
Source: NHTSA TireWise. The blank comparison table is a suggested record, not a vehicle-specific service procedure.
Information rechecked: 2 October 2026.
The explanatory diagrams were drawn from the article’s notes; they are not photographs or official service screens.
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