P0597 Code - Thermostat Heater Control Circuit Open

Discussion in 'P - Powetrain Codes' started by fault code, Jan 28, 2018.

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    fault code Administrator Staff Member

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    What Does P0597 Mean?

    OBD-II Code P0597 is defined as a Thermostat Heater Control Circuit/Open

    Some newer engines utilize thermostats that are electronically controlled by the engine control module (PCM). If the PCM detects an incorrect signal from thermostat, the PCM will set code P0597.

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    What are the common causes of P0597 ?

    The most common cause of this code being stored comes from defects in system circuitry. Loose, broken, or corroded wiring and electrical connectors are common and should be investigated first. Other possible causes include a defective electronically operated thermostat, the control housing (complete with computerized circuitry) in which the electronically controlled thermostat is often integrated could also be defective, the PCM could be faulty but this is a rare occurrence. A low engine coolant condition may also cause this code to be stored. If the engine overheats or if the cooling fan operates prematurely, this code may be stored. If there are other codes related to engine temperature or drivability are stored prior to this code being stored, diagnose and repair those before attempting to diagnose this code.

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    How do you troubleshoot P0597 ?

    The most common repairs for the P0597 code include:
    • Cleaning off or replacing damaged circuitry
    • Replacing the thermostat
    • Addressing a coolant leakage

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