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Code

P0597

Cooling

Thermostat heater control circuit open

The electric thermostat heater circuit is open.

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Most likely causes

Faulty thermostat heater
Wiring fault
Blown fuse

Symptoms you may notice

Check engine light
Possible slow warm-up

Checks to run

Test the heater element
Check fuse and wiring

Tools you may need

Multimeter

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Cooling

Coolant thermostat below regulating temperature

Engine coolant temperature sensor circuit malfunction

Insufficient coolant temperature for closed-loop fuel control

Cooling fan relay 1 control circuit malfunction

Engine coolant temperature sensor circuit low input

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