P0599 CADILLAC – Thermostat Heater Control Circuit High

 

P0599: DIY Repairing Video Tutorial

https://youtu.be/DzCDnuwDX4g

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P0599 CADILLAC Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light)  

P0599 CADILLAC Possible Causes

  Failed Engine Cooling Thermostat Heater,Engine Cooling Thermostat Heater harness is open or shorted,Engine Cooling Thermostat Heater circuit poor electrical connection  

P0599 CADILLAC 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.