Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0125 - ECT Sensor Excessive Time To Reach Closed Loop: Notes
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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