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P0598 Chevrolet Code - Thermostat Heater Control Circuit Low

Quick Answer

The P0598 Chevrolet diagnostic trouble code (DTC) indicates an issue with the thermostat heater control circuit being low. Common causes include Faulty thermostat heater element, Wiring or connector issues in the thermostat heater circuit, ECM malfunction. 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
P0598 Chevrolet indicates Thermostat Heater Control Circuit Low.
Common causes
Common causes include Faulty thermostat heater element, Wiring or connector issues in the thermostat heater circuit, ECM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P0598 Chevrolet Description

The P0598 Chevrolet diagnostic trouble code (DTC) indicates an issue with the thermostat heater control circuit being low. In modern vehicles, the thermostat controls the engine coolant temperature to ensure optimal performance and fuel efficiency. The thermostat heater helps the thermostat reach the desired operating temperature quickly, especially in cold weather conditions. When the ECM (Engine Control Module) detects that the voltage in the thermostat heater control circuit is low, it triggers the P0598 code, indicating a potential malfunction in the system.

OBDII Code P0598 Chevrolet - Thermostat Heater Control Circuit Low
P0598 Chevrolet Code - Thermostat Heater Control Circuit Low

Common Causes of P0598 Chevrolet

  1. Faulty thermostat heater element.
  2. Wiring or connector issues in the thermostat heater circuit.
  3. ECM malfunction.
  4. Low coolant levels affecting thermostat operation.
  5. Corrosion or damage to thermostat components.

Symptoms of P0598 Chevrolet

  1. Illuminated check engine light on the dashboard.
  2. Engine running hotter or cooler than usual.
  3. Poor fuel economy.
  4. Heater not working properly in the cabin.
  5. Engine overheating under heavy load or at idle.

How to Fix P0598 Chevrolet

  1. Use a diagnostic scanner to confirm the P0598 code and pinpoint the exact cause.
  2. Inspect the thermostat heater element for continuity and replace if faulty.
  3. Check wiring and connectors for any damage or corrosion, repairing or replacing as needed.
  4. Test the ECM to ensure proper functioning and address any issues if found.
  5. Refill coolant levels and ensure proper thermostat operation.

Cost to Fix P0598 Chevrolet

The typical repair cost for addressing the P0598 Chevrolet code can range from $150 to $400, depending on the specific cause of the issue and the labor rates at the auto repair shop. Additional costs may be incurred if any parts need to be replaced. It's recommended to consult with a trusted mechanic or dealership for an accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0598 Chevrolet

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 104°C (220°F). The mechanical thermostat will cycle from approximately 104°C (220°F) to approximately 98°C (208°F). The heater is part of the thermostat. The engine coolant thermostat heater and the thermostat housing are serviced as an assembly.





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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 P0598 Chevrolet Code

1. What are the common symptoms of OBDII code P0598 in a Chevrolet related to the thermostat heater control circuit being low?

Symptoms may include an illuminated check engine light, engine running cooler than normal, poor fuel efficiency, and issues with the vehicle's heater system.

2. What typically causes the OBDII code P0598 in a Chevrolet to trigger?

The code P0598 is usually triggered by a malfunction in the thermostat heater control circuit, often due to a faulty thermostat, damaged wiring, or a failing thermostat heater.

3. How can I diagnose the cause of OBDII code P0598 in my Chevrolet?

Diagnosing the issue involves checking the thermostat heater circuit for continuity, inspecting the wiring for any damage or corrosion, and testing the thermostat itself to ensure proper functioning.

4. Can I continue driving my Chevrolet with OBDII code P0598 present?

While it may be possible to drive the vehicle with the code present, it is recommended to address the issue promptly to prevent potential damage to the engine and ensure optimal performance.

5. How can I repair OBDII code P0598 in my Chevrolet?

Repairing the code typically involves replacing the faulty thermostat, repairing or replacing damaged wiring, or addressing any issues with the thermostat heater. It is advisable to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any DIY tips for troubleshooting OBDII code P0598 in a Chevrolet?

DIY troubleshooting tips include checking the fuse related to the thermostat circuit, inspecting the wiring for visible damage, and testing the thermostat for proper operation using a multimeter.

7. Will resetting the OBDII code P0598 in my Chevrolet make it go away permanently?

Resetting the code without addressing the underlying issue will not resolve the problem permanently. It is essential to diagnose and repair the root cause to prevent the code from reoccurring.

8. Can extreme weather conditions affect the thermostat heater control circuit and trigger OBDII code P0598?

Extreme cold or hot weather conditions can potentially affect the thermostat heater control circuit, leading to issues that may trigger the OBDII code P0598 in a Chevrolet.

9. Is it safe to ignore OBDII code P0598 in my Chevrolet if the symptoms are minimal?

Ignoring the code can lead to decreased engine performance, decreased fuel efficiency, and potential damage to engine components over time. It is recommended to address the issue promptly.

10. How long does it typically take to repair OBDII code P0598 in a Chevrolet?

The repair time for OBDII code P0598 can vary depending on the exact cause of the issue and the complexity of the repair. It is advisable to consult a professional mechanic for a more accurate estimate.

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