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P0597 Ford Code - Thermostat Heater Control Circuit Failure

Quick Answer

The P0597 diagnostic trouble code (DTC) for Ford vehicles indicates a "Thermostat Heater Control Circuit Failure." This code is related to the thermostat heater control circuit, which is responsible for regulating the engine's operating temperature by controlling the opening and closing of the thermostat. Common causes include Faulty thermostat heater, Wiring issues (shorts, opens, damaged wires), Malfunctioning engine control module (ECM). 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 Ford indicates Thermostat Heater Control Circuit Failure .
Common causes
Common causes include Faulty thermostat heater, Wiring issues (shorts, opens, damaged wires), Malfunctioning engine control module (ECM).
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 11, 2024
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Code P0597 Ford Description

The P0597 diagnostic trouble code (DTC) for Ford vehicles indicates a "Thermostat Heater Control Circuit Failure." This code is related to the thermostat heater control circuit, which is responsible for regulating the engine's operating temperature by controlling the opening and closing of the thermostat. The thermostat heater helps the engine reach optimal operating temperature quickly, which improves fuel efficiency, reduces emissions, and ensures proper engine performance.

OBDII Code P0597 Ford - Thermostat Heater Control Circuit Failure
P0597 Ford Code - Thermostat Heater Control Circuit Failure

Common Causes of P0597 Ford

  1. Faulty thermostat heater
  2. Wiring issues (shorts, opens, damaged wires)
  3. Malfunctioning engine control module (ECM)
  4. Poor connection in the thermostat heater circuit
  5. Corrosion or damage to connectors in the circuit

Symptoms of P0597 Ford

  1. Engine running hotter or colder than normal
  2. Poor fuel efficiency
  3. Check Engine Light illuminated
  4. Engine overheating
  5. Reduced heater performance in the cabin

How to Fix P0597 Ford

  1. Diagnose the issue by using a scan tool to read the DTC and test the thermostat heater circuit.
  2. Inspect the wiring, connectors, and thermostat heater for any damage or faults.
  3. Replace the faulty thermostat heater if needed.
  4. Repair or replace any damaged wiring or connectors in the circuit.
  5. Clear the DTC and test drive the vehicle to ensure the issue is resolved.

Cost to Fix P0597 Ford

The typical repair cost for addressing a P0597 Ford code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost can fall between $150 and $500. It's important to note that these estimates are rough guidelines and actual costs may vary based on the location, vehicle make and model, and the shop's labor rates.

What does this mean?

Tech Notes for P0597 Ford

If there are no coolant system leaks, replace the thermostat to fix the problem.



The Comprehensive component monitor (CCM) monitors the THTRC circuit to the Powertrain Control Module (PCM) for high and low voltage. If during testing; voltage was to fall below a calibrated limit for a calibrated amount of time the test will fail and set the DTC and MIL.

When is the Code Detected?

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

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Information for Specific Ford Models

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.

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