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 at 3000 RPM with no loads and transmission in Park or Neutral, until radiator cooling fan comes on. Allow engine to idle. Using scan tool, check ECT data. If indicated temperature is 176-194°F (80-90°C), problem is intermittent. System is okay at this time. Check cooling system. If indicated temperature is not 176-194°F (80-90°C), check cooling system. If 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.