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DTC P0125: Closed Loop Temp Not Reached: Testing

  1. Turn ignition off. Disconnect ECT sensor connector. ECT sensor is mounted in thermostat housing. See Figure . Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. If connector is okay, reconnect connector and go to next step.
    2. NOTE: The following test will be invalid if thermostat is stuck open.
  2. Start engine and allow it to idle until engine temperature is more than 180°F (82.2°C). Check thermostat operation. Replace thermostat as necessary. If thermostat is operating correctly, go to next step.
    3. NOTE: Engine temperature must be more than 80°F (26.6°C) in this step.
  3. Turn ignition off. Disconnect ECT sensor connector. Using an ohmmeter, measure resistance between ECT sensor terminals. If resistance is less than 11,000 ohms, go to next step. If resistance is 11,000 ohms or more, replace ECT sensor.
  4. Ensure ignition is off. Disconnect PCM connectors. PCM is located in engine compartment on left front fender, near radiator support. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, go to next step.
  5. At this time, PCM is assumed to be defective. Replace PCM.
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