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For my 2004 Chevrolet Trailblazer 4.2L, what is the most probable cause of engine code P0597?

Vehicle: 2004 Chevrolet Trailblazer 4.2L

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The thermostat is the most likely cause of the problem.

P0597 Chevrolet Code - Thermostat Heater Control Circuit Open
Read more: https://www.autocodes.com/p0597_chevrolet.html

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