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 P015, Open ECT Sensor Signal: Notes
Engine coolant temperature sensor is a 2-wire thermistor, whose resistance varies with temperature. Sensor signal is on circuit No. 410. Sensor ground is on circuit No. 476.
As sensor temperature increases, sensor resistance decreases. High coolant temperature will result in low signal voltage on circuit No. 410. Code P015 sets because PCM assumes coolant temperature cannot be -20°F (-29°C) or less when IAT is -9.4°F (-23°C) or greater.
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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.