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 P1116: Engine Coolant Temperature (ECT) Sensor 1 Range/Performance Problem: General Description
Two engine coolant temperature (ECT) sensors and one intake air temperature (IAT) sensor are used by the powertrain control module (PCM). When the engine is stopped and enough time has passed, the temperature of the engine will equalize to the ambient temperature. ECT sensor 1 and IAT sensor are compared to ECT sensor 2, and if an inappropriate temperature is read, the PCM detects a malfunction in the corresponding sensor and stores a DTC.
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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.
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