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.
Code P0125, Coolant Sensor Excessive Time To Closed Loop "S" & "T" Series 4.3L (VIN W): Notes
While engine is warming, control module monitors coolant sensor to determine how long it takes engine to reach temperature for closed loop operation. Control module checks for code conditions during a cold start and only once per cold start.
- Checks engine warm-up rate.
- Checks coolant sensor reading on Tech 1 against actual coolant temperature.
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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.