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P0599 Chevrolet Code - Thermostat Heater Control Circuit High

Quick Answer

The P0599 code for Chevrolet vehicles indicates an issue with the thermostat heater control circuit being too high. Common causes include Faulty thermostat heater control circuit, Wiring issues or shorts in the circuit, Corrosion or damage to connections. 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
P0599 Chevrolet indicates Thermostat Heater Control Circuit High.
Common causes
Common causes include Faulty thermostat heater control circuit, Wiring issues or shorts in the circuit, Corrosion or damage to connections.
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 Sep 06, 2024
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Code P0599 Chevrolet Description

The P0599 code for Chevrolet vehicles indicates an issue with the thermostat heater control circuit being too high. The thermostat heater control circuit is responsible for regulating the temperature of the engine coolant by controlling the thermostat. When this circuit detects a higher than normal voltage, it triggers the P0599 code. This can lead to the engine running at incorrect temperatures, which can affect performance and fuel efficiency.

OBDII Code P0599 Chevrolet - Thermostat Heater Control Circuit High
P0599 Chevrolet Code - Thermostat Heater Control Circuit High

Common Causes of P0599 Chevrolet

  1. Faulty thermostat heater control circuit
  2. Wiring issues or shorts in the circuit
  3. Corrosion or damage to connections
  4. Defective thermostat
  5. Engine control module (ECM) malfunction

Symptoms of P0599 Chevrolet

  1. Engine overheating
  2. Decreased fuel efficiency
  3. Check Engine Light illuminated
  4. Engine running too hot or too cold
  5. Inconsistent temperature gauge readings

How to Fix P0599 Chevrolet

  1. Begin by performing a thorough inspection of the thermostat heater control circuit, checking for any visible damage or corrosion in the wiring and connections.
  2. Test the thermostat heater control circuit using a multimeter to determine if there is an issue with the voltage.
  3. Replace the thermostat if it is found to be faulty, ensuring it is the correct part for your specific Chevrolet model.
  4. Repair any damaged wiring or connections in the circuit, ensuring proper insulation and secure connections.
  5. Clear the diagnostic trouble codes from the vehicle's ECM using a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0599 Chevrolet

The cost of repairing a P0599 code on a Chevrolet vehicle can vary depending on the specific model, year, and engine type. Typically, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. This can bring the total repair cost to approximately $200 to $500. However, it is important to note that labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate based on your location and vehicle.

What does this mean?

Tech Notes for P0599 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 P0599 Chevrolet Code

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  • what exactly is the ecm

    Reply to Comment

  • Engine Control Module (ECM).

    What is ECM?
    Read more: https://www.autocodes.com/a...

    Reply to Comment

  • p0599 came up on my 2016 Cruze LT 1.8. I cleared the code with an OBD2 device and it instantly came back. I reseated the electrical connector to the thermostat housing, released the pressure in the system by removing the overflow cap, then let it sit overnight. This morning I cleared the code and drove it for 25 mins, it hasn't popped back up yet.

    Reply to Comment

  • Thank you for the information! Hopefully the code doesn't come back.

    Reply to Comment