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DTC P0125: ECT Sensor Malfunction/Slow Response (2004 model)

  1. Start the engine, and let it idle.
  2. Check the ECT with a scan tool or the HDS.

    Is about 86°F (30°C) or less, or 2.61 V or more indicated? 

    1. YES -  Go to step 3.
    2. NO -  Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.
  3. Let it idle for 6 minutes.
  4. Check the ECT with a scan tool or the HDS.

    Is about 86°F (30°C) or less, or 2.61 V or more indicated? 

    1. YES -  Replace the ECT sensor (see CKP SENSOR REPLACEMENT  ).
    2. NO -  Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.
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