For Shop Owners

P0599 - Thermostat Heater Control Circuit High

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 P0599 is triggered when there is an open or short thermostat heather control circuit.

Possible symptoms

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

P0599 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 P0599 - Thermostat Heater Control Circuit High -

P0599 Information for specific makes

P0599 AUDI Thermostat Heater Control Circuit High
P0599 BMW Thermostat Heater Control Circuit High
P0599 BUICK Thermostat Heater Control Circuit High
P0599 CADILLAC Thermostat Heater Control Circuit High
P0599 CHEVROLET Thermostat Heater Control Circuit High
P0599 GMC Thermostat Heater Control Circuit High
P0599 MINI Thermostat Heater Control Circuit High
P0599 VOLKSWAGEN Thermostat Heater Control Circuit High

Need more help?

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P0599 Comments

Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0599 code? Have you replaced any parts?
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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