P0125

DTC P0125: ECT Sensor Malfunction/Slow Response

1. Start the engine, and let it idle.
2. Check the ECT SENSOR in the DATA LIST with the HDS.

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

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.

3. Let the engine idle 6 minutes.
4. Check the ECT SENSOR in the DATA LIST with the HDS.

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

YES - Replace the ECT sensor.

NO - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.