For Shop Owners

P0597 BMW - Thermostat Heater Control Circuit Open

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Failed Engine Cooling Thermostat
  • Engine Cooling Thermostat harness is open or shorted
  • Engine Cooling Thermostat circuit poor electrical connection
What does this mean?

Tech notes

If there are not coolant system leaks, replaced the thermostat to fix the problem.
What does this mean?

When is the code detected?

The P0597 is triggered when there is an open or short thermostat heather control circuit.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0597 BMW Description

The Engine Control Module (ECM) controls the Pulse Width Modulated (PWM) thermostat. The engine coolant thermostat heater controls coolant flow and regulates the engine operating temperature. The ECM supplies 12 V to the thermostat. The ECM controls the engine coolant thermostat heater by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.
OBDII Code P0597 Bmw - Thermostat Heater Control Circuit Open -

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P0597 BMW Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 04-28-2017

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