The TPMS warning light came on on my wife's 2018 Elantra. One tire was slightly below the trigger level and I easily pumped it back up. However the warning light still refuses to go out even after driving for various times at various speeds (up to and including 1/2 hour at 75 mph)

The users manual states (in the "Changing a tire with TPMS" section)

Once the original tire equipped with a tire pressure monitoring sensor is reinflated to the recommended pressure and reinstalled on the vehicle, the Low Tire Pressure LCD position indicator and TPMS Malfunction Indicator will go off within a few minutes of driving

I googled for solutions to this and could't find a suitable answer. Some Hyundai's apparently have a reset button under the steering wheel, but as far as I can tell this model doesn't. Another video I saw (not in English), seemed to suggest connecting an OBD2 reader and using that to reset the light. This is confusing me, as on my Subaru the light resets automatically when you start the car and drive for a bit if the pressures are above minimum.

So what is the solution to this?

Note that there is also a TPMS Malfunction Indicator that uses the same warning light on the dash. The manual says that this is indicated by flashing the warning light for 1 minute before going solid after starting the car. This light comes on solid and doesn't flash, so IMHO it is not indicating a system fault.

  • Did you check ALL of the tires when you filled the low one up? It could be there is more than one tire low. Commented Oct 25, 2021 at 21:21
  • @Pᴀᴜʟsᴛᴇʀ2 Yes I checked all the tires, and pumped them all up to the same pressure. But the TPMS is only indicating a single tire anyway.
    – Peter M
    Commented Oct 25, 2021 at 21:25
  • Did you overfill them? I know on my wife's car (08 Azera LTD), if they are too hard, the TPMS light will come on as well. I think the system gives me about +/- 5psi (might be less) ... I would bet the Elantra has the same basic system on it. Commented Oct 25, 2021 at 21:43
  • @Pᴀᴜʟsᴛᴇʀ2 That's a whole different question that I'm planning to ask about. I live at 7,000 feet and the TPMS system isn't calibrated for that. It generally reads about 4 psi low. So I fill to 36 psi absolute, but the TPMS system sees this as 32 psi, which matches the requirements. This is the recommended solution from multiple, local dealers. But all 4 wheels were set to 36 psi absolute, and only 1 tire is showing as low.
    – Peter M
    Commented Oct 25, 2021 at 21:49
  • Fair enough ... thanks for entertaining my questions. Commented Oct 25, 2021 at 23:02


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