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.
Circuit Description
A thermistor built into engine coolant temperature sensor changes resistance value according to engine coolant temperature. Structure of sensor and connection to ECM is same as in intake air temperature circuit malfunction. See DTC P0110: INTAKE AIR TEMPERATURE CIRCUIT MALFUNCTION . If ECM detects DTC P0115, it operates fail safe function in which engine coolant temperature is assumed to be 176°F (80°C).
Detecting condition of DTC is when there is an open or short in engine coolant temperature sensor circuit. After confirming DTC P0115, use hand-held tester or OBD II scan tool to confirm engine coolant temperature from CURRENT DATA. See IDENTIFYING ENGINE COOLANT TEMPERATURE table.
| Temperature Displayed | Malfunction |
|---|---|
| -40°F (-40°C) | Open Circuit |
| 284°F (140°C) | Short Circuit |
NO RELATED
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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.