The Engine Coolant Temperature (ECT) sensor is sending a low voltage signal indicating very high coolant temperature. This sensor tells the computer how hot or cold the engine is, which affects fuel mixture, ignition timing, and transmission shift points.
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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.