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.
Diagnostic Aids
DTC P0125 indicates lower than normal engine coolant temperature, which most likely was not caused by a short/open or intermittent short/open in the ECT wiring.
Possible causes of low engine coolant temperature:
- Thermostat stuck open.
- Cooling fan always on.
- Very low ambient temperatures.
- Corrosion in connector or resistance in wiring.
- Skewed ECT sensor.
For resistance values, see TEMPERATURE VS RESISTANCE table under DTC P0117: ECT SENSOR CIRCUIT - LOW VOLTAGE/HIGH TEMPERATURE.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.