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P0128-THERMOSTAT RATIONALITY When Monitored: The engine running. During cold start. Set Condition: The PCM predicts a coolant temperature value that it will compare to the actual coolant temperature. If the two coolant temperature values are not within 10°C (50°F) of each other an error is detected. Basically your thermostat has failed.

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Q: What is a P0128 error code for a 2004 Dodge Caravan?
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