Engine-Codes - Cadillac - P0597 CADILLAC

P0597 CADILLAC Code - Thermostat Heater Control Circuit Open

- Code Popularity: 1,995 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0597 CADILLAC Code?

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

|How to Fix the P0597 CADILLAC Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0597 CADILLAC code?

Labor: 1.0

The cost to diagnose the P0597 CADILLAC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0597 CADILLAC code detected?

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

|What are P0597 CADILLAC code possible symptoms?

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

|What Does the P0597 CADILLAC Code Mean?

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.

Thermostat Heater Control Circuit Open

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