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 P0116: Engine Coolant Temperature (ECT) Sensor Range/Performance Problem
Start engine and run it at 3000 RPM with no loads and transmission in Park or Neutral, until radiator cooling fan comes on. Let engine idle. Using scan tool, check ECT sensor data. If temperature is 176-200°F (80-93°C) or voltage is .4-.7 volts, problem is intermittent, system is okay at this time. Check thermostat and cooling system. If temperature is not 176-194°F (80-90°C) or voltage is not .4-.7 volts, check thermostat and cooling system. If thermostat and cooling system is okay, replace ECT sensor.
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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.