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

WARNING: This page is about a different car, the 1997 Pontiac Bonneville, 1997 Oldsmobile Regency, 1997 Oldsmobile LSS, 1997 Oldsmobile Eighty-Eight, and 1997 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.

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.