Symptoms
- TPMS light on after driving over something
- Ride feels unusually stiff compared to before
- Tire looks fine but the warning system flagged a pressure loss
- No spare tire in the vehicle
Likely causes
- CommonPuncture, common for any tire typeRun-flats puncture just like regular tires; the difference is what happens after.
- CommonReinforced sidewall masking a flat until TPMS alerts youRun-flats are designed so you may not feel a flat by ride quality alone; you rely on the TPMS system.
What to do
- Check the TPMS display or app for which tire lost pressure.
- Note the mileage driven since the warning appeared; most run-flats are rated for no more than about 50 miles at reduced speed once flat.
- Avoid exceeding the speed limit printed in your manual for run-flat use after a puncture, typically around 50 mph.
- Get to a tire shop as soon as reasonably possible rather than continuing to drive on it.
- Expect that most run-flat tires cannot be patched after being driven on flat, since the internal structure that supports the vehicle weight is compromised; ask the shop to confirm.
Tools and parts
- Tire pressure gauge
Replacement run-flat tire matching your vehicleSearch: “run-flat tire size for [your car model]”
When to call a pro
Have a tire shop confirm whether the specific run-flat can be repaired; most manufacturers advise against repairing one that's been driven while flat.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.