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P0597

P0597 - Thermostat Heater Control Circuit Open

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Possible causes
- Failed Engine Cooling Thermostat
- Engine Cooling Thermostat harness is open or shorted
- Engine Cooling Thermostat circuit poor electrical connection
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Tech notes
If there are not coolant system leaks, replaced the thermostat to fix the problem.
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When is the code detected?
The P0597 is triggered when there is an open or short thermostat heather control circuit.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0597 Information for specific makes
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