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TPMS Light On Constantly on 2020 MDX - Replaced Sensors Already

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Mike T. · rep 0 · May 25, 3:42 AM · 1 replies · solved · Question

Vehicle: 2020 Acura MDX Technology

I have a 2020 Acura MDX Technology package, and my TPMS warning light has been on for weeks now. It's really frustrating because I've already tried to fix it myself.

I even had the tire shop replace all four sensors, thinking they were the issue, but the light is still there. The readings are often incorrect or just show dashes instead of pressure values.

What could be causing this? Is there a specific reset procedure I'm missing after sensor replacement, or could this be a more serious issue with the TPMS control module or wiring?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:42 AM

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ClearTheCode admin answer:

It's certainly frustrating when the TPMS light persists even after replacing the sensors on your 2020 Acura MDX Technology. This often indicates a communication issue or a problem with the system's control unit rather than the sensors themselves.

Here's what could be happening and what to check:

  1. TPMS Recalibration/Relearn Procedure:

    • After replacing sensors, the vehicle's TPMS system needs to 'learn' the new sensor IDs. While some systems auto-learn after driving, many Acuras require a specific recalibration. This is usually done through the vehicle's infotainment system (Vehicle Settings > TPMS Calibration) or by a scan tool at a shop.
    • Ensure the tire shop performed the correct relearn procedure for your specific MDX model year.

  2. TPMS Control Unit Malfunction:

    • The TPMS control unit (also known as the receiver) is responsible for receiving signals from the tire pressure sensors. If this module is faulty, it won't be able to communicate with the sensors, leading to a constant warning light and no readings.
    • OBD Code: A common diagnostic trouble code related to the TPMS control unit or sensor communication is C1290 (TPMS Sensor Malfunction) or similar codes indicating a system fault.

  3. Wiring or Antenna Issues:

    • The TPMS control unit relies on an antenna (or multiple antennas) to pick up the sensor signals. Damage to the wiring leading to the control unit or the antenna itself can disrupt communication.

  4. Sensor Compatibility:

    • While less common if installed by a professional, ensure the replacement sensors are the correct frequency and type for your 2020 MDX.

When to See a Shop: Since you've already replaced the sensors, the next logical step is to have an Acura dealership or a reputable independent shop with advanced diagnostic tools investigate. They can use a specialized scan tool to:

  • Read the actual sensor IDs and confirm they are being broadcast.
  • Check for specific TPMS-related diagnostic trouble codes (DTCs).
  • Test the TPMS control unit and its wiring for proper function. This will help pinpoint whether the issue is with the module, wiring, or an incomplete calibration.
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