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Error code P0594 on a 2003 Dodge Ram indicates a problem with the engine's cooling system, specifically related to the thermostat. This code signifies that the thermostat is stuck open, which can lead to poor engine performance, increased emissions, and reduced fuel efficiency. It's important to diagnose and address this issue promptly to avoid further engine complications. Checking the thermostat and related components for proper function is recommended.

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∙ 6mo ago

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