AutoCodes – Ford – P0597 1999 Ford F150

P0597 1999 Ford F150 Code - Thermostat Heater Control Circuit Failure

Quick Answer

The Engine Control Module (ECM) controls the Pulse Width Modulated (PWM) thermostat. Common causes include Failed Engine Cooling Thermostat, Engine Cooling Thermostat harness is open or shorted, Engine Cooling Thermostat 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 1999 Ford F150 indicates Thermostat Heater Control Circuit Failure .
Common causes: Common causes include Failed Engine Cooling Thermostat, Engine Cooling Thermostat harness is open or shorted, Engine Cooling Thermostat 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 1,916

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 1999 Ford F150 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.

OBDII Code P0597 1999 Ford F150 - Thermostat Heater Control Circuit Failure - AutoCodes.com — P0597 1999 Ford F150 Code - Thermostat Heater Control Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P0597 1999 Ford F150?

Failed Engine Cooling Thermostat
Engine Cooling Thermostat harness is open or shorted
Engine Cooling Thermostat circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0597 1999 Ford F150?

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

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0597 1999 Ford F150 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 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P0597 in a 1999 Ford F150?

- Common symptoms include engine overheating, erratic temperature gauge readings, and a check engine light.

2. What does the OBDII code P0597 indicate in a 1999 Ford F150?

- OBDII code P0597 indicates a thermostat heater control circuit failure.

3. What are the possible causes of OBDII code P0597 in a 1999 Ford F150?

- Possible causes include a faulty thermostat, damaged wiring or connectors, a malfunctioning thermostat heater control circuit, or a faulty PCM.

4. How can I diagnose the OBDII code P0597 in my 1999 Ford F150?

- Diagnosis involves checking the thermostat operation, inspecting the wiring and connectors for damage, and testing the thermostat heater control circuit.

5. Can I continue driving my 1999 Ford F150 with OBDII code P0597?

- It is not recommended to drive with OBDII code P0597 as it can lead to engine overheating and potential damage.

6. How can I repair OBDII code P0597 in my 1999 Ford F150?

- Repair typically involves replacing the thermostat, repairing any damaged wiring or connectors, or replacing the thermostat heater control circuit.

7. Is it possible to clear the OBDII code P0597 in a 1999 Ford F150 without fixing the issue?

- Clearing the code without fixing the underlying issue may temporarily turn off the check engine light, but the problem will likely persist and the code may return.

8. Can a DIY enthusiast fix OBDII code P0597 in a 1999 Ford F150?

- Depending on the individual's skill level, DIY enthusiasts may be able to diagnose and repair OBDII code P0597 by following a service manual and using the necessary tools.

9. How much does it cost to fix OBDII code P0597 in a 1999 Ford F150 at a repair shop?

- The cost of fixing OBDII code P0597 at a repair shop can vary depending on the exact cause of the issue, but it typically ranges from $150 to $400.

10. Will fixing OBDII code P0597 improve the performance and fuel efficiency of my 1999 Ford F150?

- Yes, fixing OBDII code P0597 can help restore proper engine temperature control, leading to improved performance and fuel efficiency in your 1999 Ford F150.