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Engine & warning lightsP0128 Code: Thermostat Stuck Open and Its Effect on Engine Temp and EconomyExplaining the P0128 code linked to a thermostat stuck open, preventing the engine from reaching optimal operating temperature.Fault codeP0128 — Coolant thermostat below regulating temperatureP0128 means the engine isn't reaching normal operating temperature, usually the thermostat. Learn the causes and typical repair cost.