DTC P0125 - ECT Sensor Excessive Time To Reach Closed Loop: Notes

NOTE: For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .

While engine is warming, PCM reads Engine Coolant Temperature (ECT) sensor to determine how long it takes coolant to reach temperature required for closed loop operation. PCM compares actual time required to a predetermined time.

Conditions required to set DTC are:

No ECT or IAT DTCs are set.
Vehicle speed greater than 5 MPH.
IAT greater than 50°F (10°C).
ECT greater than 32°F (0°C).
Start-up ECT less than 70°F (21°C).
Closed loop operation temperature of 68°F (20°C) not reached within 2 minutes of start-up.