AutoCodes – Buick – P0597 Buick

P0597 Buick Code - Thermostat Heater Control Circuit Open

Quick Answer

The Engine Control Module (ECM) controls the Pulse Width Modulated (PWM) thermostat. Common causes include Failed Engine Cooling Thermostat Heater, Engine Cooling Thermostat Heater harness is open or shorted, Engine Cooling Thermostat Heater circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0597 Buick indicates Thermostat Heater Control Circuit Open.
Common causes: Common causes include Failed Engine Cooling Thermostat Heater, Engine Cooling Thermostat Heater harness is open or shorted, Engine Cooling Thermostat Heater circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 5,467

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 27, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0597 Buick 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. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 15 s.

OBDII Code P0597 Buick - Thermostat Heater Control Circuit Open - AutoCodes.com — P0597 Buick Code - Thermostat Heater Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0597 Buick?

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 DTC P0597 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The engine coolant thermostat heater has a mechanical fail-safe in case of an electrical condition with the engine coolant thermostat heater. The mechanical thermostat will open at approximately 104Â°C (220Â°F). The mechanical thermostat will cycle from approximately 104Â°C (220Â°F) to approximately 98Â°C (208Â°F). The heater is part of the thermostat. The engine coolant thermostat heater and the thermostat housing are serviced as an assembly.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0597 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0597 Buick Code

1. What are the common symptoms of OBDII code P0597 in a Buick related to the thermostat heater control circuit being open?

- The common symptoms include the engine running cooler than normal, poor fuel economy, and potential issues with the heating system in the vehicle.

2. What are the possible causes of the OBDII code P0597 in a Buick indicating an open thermostat heater control circuit?

- The code P0597 in a Buick is often caused by a faulty thermostat, a problem with the thermostat heater control circuit, a damaged wiring harness, or a malfunctioning thermostat heater control module.

3. How can I diagnose the OBDII code P0597 in my Buick related to the thermostat heater control circuit being open?

- Diagnosing the code P0597 involves using an OBDII scanner to retrieve the code, checking the thermostat and related components for any visible damage, and testing the thermostat heater control circuit for continuity.

4. What are some repair tips for fixing the OBDII code P0597 in a Buick due to an open thermostat heater control circuit?

- Repair tips include replacing the thermostat if it is faulty, repairing or replacing damaged wiring in the thermostat heater control circuit, and resetting the trouble code after completing the repairs.

5. Can I continue to drive my Buick with the OBDII code P0597 indicating an open thermostat heater control circuit?

- It is not recommended to drive the vehicle with the code P0597 present, as it can lead to engine performance issues and potential damage over time. It is best to address the problem promptly.

6. Is it possible to clear the OBDII code P0597 in a Buick without fixing the underlying issue with the thermostat heater control circuit?

- While you can clear the trouble code using an OBDII scanner, it is crucial to address the root cause of the problem to prevent further issues and ensure the proper functioning of the thermostat heater control circuit.

7. How much does it typically cost to repair the OBDII code P0597 in a Buick related to an open thermostat heater control circuit?

- The cost of repairing the code P0597 can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor, including the replacement of the thermostat or any damaged components.

8. Are there any preventative measures I can take to avoid encountering the OBDII code P0597 in my Buick in the future?

- To prevent the code P0597 from occurring, it is essential to perform regular maintenance on the cooling system, including checking the thermostat and related components for any signs of wear or damage.

9. Can a DIY enthusiast with basic automotive knowledge fix the OBDII code P0597 in a Buick on their own?

- Depending on the extent of the issue, a DIY enthusiast may be able to address the code P0597 by replacing the thermostat or repairing the thermostat heater control circuit, as long as they have the necessary tools and expertise.

10. How long does it typically take to repair the OBDII code P0597 in a Buick caused by an open thermostat heater control circuit?

- The repair time for the code P0597 can vary based on the specific issue and the expertise of the technician, but it may take approximately 1-3 hours to diagnose and fix the problem.