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 P0115: Engine Coolant Temperature Circuit; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input [09/2013 - ]: Description
- A thermistor is built into the engine coolant temperature sensor, of which the resistance value varies according to the engine coolant temperature.
The structure of the sensor and connection to the ECM are the same as the intake air temperature sensor.
HINT:
When any of DTCs P0115, P0117 and P0118 are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECT is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0115 | An open or short in the engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
|
| P0117 | A short in the engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
|
| P0118 | An open in the engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
|
HINT:
When any of these DTCs are stored, check the ECT by electing the following menus on the Techstream: Powertrain / Engine and ECT / Data List / Coolant Temp.
| Temperature Displayed | Malfunction |
|---|---|
| -40°C (-40°F) | Open circuit |
| Higher than 135°C (275°F) | 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.