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How To Fix Code P059f

How To Fix Code P059f: A Comprehensive Guide

P059f code is a commonly encountered issue in automotive diagnostics. It is related to the thermostat heater control circuit high. When this code appears, it indicates that there is a problem with the thermostat heater control circuit, which can lead to issues with engine temperature regulation.

Diagnosing the problem

To fix this issue, you will first need to diagnose the source of the problem. Here are the steps to follow:

1. Check for loose or damaged wiring: Inspect all the wiring connected to the thermostat and heater control circuit. Look for any loose connections, frayed wires, or signs of damage. If you find any issues, repair or replace the wiring as necessary.

2. Test the thermostat heater: Use a multimeter to measure the resistance across the terminals of the thermostat heater. The specific resistance value may vary depending on the vehicle’s make and model, so consult the manufacturer’s specifications. If the resistance is significantly different from the expected value, replace the thermostat.

3. Inspect the coolant temperature sensor: The coolant temperature sensor is responsible for relaying information about the engine’s temperature to the control module. Check the sensor for any signs of damage or corrosion. If necessary, replace the coolant temperature sensor.

4. Check the heater control circuit relay: Locate the relay responsible for controlling the heater circuit. Test the relay using a multimeter or swap it with a known working relay to see if the problem persists. If the relay is faulty, replace it.

Fixing the issue

Once you have identified and addressed the underlying problem, you can reset the trouble code using an OBD-II scanner. Clearing the code will turn off the check engine light. However, it is important to note that simply clearing the code without fixing the root cause will likely result in the code reappearing.

In summary, if you encounter the P059f code, it is essential to diagnose and address the underlying issue promptly. By following these steps and fixing the problem at its source, you can resolve the thermostat heater control circuit high problem effectively.


What does the diagnostic code P059F indicate?

The diagnostic code P059F indicates a problem with the thermostat heater control circuit. This code usually means that there is an issue with the electrical components of the thermostat system, specifically the heater control circuit. The heater control circuit is responsible for regulating the temperature of the engine coolant by controlling the operation of the thermostat.

To fix this issue, you can start by inspecting the wiring and connectors associated with the thermostat heater control circuit. Look for any signs of damage or corrosion that may be causing a poor electrical connection. If any issues are found, repair or replace the damaged components.

If the wiring and connectors appear to be in good condition, the next step would be to test the thermostat itself. You can do this by measuring the resistance across the terminals of the thermostat using a multimeter. Compare the measured resistance value to the manufacturer’s specifications to determine if the thermostat is functioning properly. If the resistance is outside of the acceptable range, the thermostat should be replaced.

After making any necessary repairs or replacements, it’s important to clear the diagnostic code from the vehicle’s computer system. This can be done using an OBD-II scanner or by disconnecting the battery for a few minutes. If the issue has been resolved, the code should no longer reappear.

It’s worth noting that diagnosing and fixing automotive issues can be complex, so if you’re not comfortable with these steps, it’s recommended to seek assistance from a professional mechanic.

What is the cost of repairing active grill shutters?

The cost of repairing active grill shutters can vary depending on the specific make and model of the vehicle, as well as the extent of the damage. On average, the cost for repairing or replacing active grill shutters can range from $200 to $500, including parts and labor. However, it is always recommended to get a quote from a professional repair service to get an accurate estimate for your specific vehicle.

What is the meaning of active grille shutter performance?

The active grille shutter performance refers to the functioning and efficiency of the active grille shutter system in a vehicle. The active grille shutters are designed to improve fuel efficiency and aerodynamic performance by controlling the airflow through the front grille of a vehicle. These shutters can open or close automatically based on various factors such as engine temperature, vehicle speed, and cooling needs.

When the shutters are closed, it reduces drag and redirects the airflow around the vehicle instead of allowing it to enter the grille. This helps in improving aerodynamics and reducing fuel consumption. On the other hand, when the shutters are open, it allows more air to flow through the grille, resulting in better engine cooling.

To ensure optimal performance of the active grille shutter system, regular maintenance is essential. This includes checking for any obstructions or damage to the shutters, ensuring proper operation of the motor or actuator that controls the shutters, and cleaning any debris or dirt that may accumulate on the shutters or grille.

If there are issues with the active grille shutter performance, such as the shutters not opening or closing properly, it is recommended to consult the vehicle’s manual or contact a professional mechanic for further assistance.

Can the active grill shutter trigger the check engine light?

Yes, the active grill shutter can trigger the check engine light. The active grill shutter system is designed to improve aerodynamics and fuel efficiency by opening and closing the grille as needed. However, if there is a malfunction in the system, such as a faulty sensor or actuator, it can cause the check engine light to illuminate. When this happens, it is important to diagnose and fix the issue as soon as possible to prevent further damage and ensure optimal engine performance.

Questions you’ve probably asked yourself

How to fix Code P059f on a car’s engine?

To fix Code P059f on a car’s engine, follow these steps:
1. Check the coolant temperature sensor to ensure it is functioning properly. If necessary, replace the sensor.
2. Inspect the wiring and connectors associated with the coolant temperature sensor for any damage or corrosion. Repair or replace as needed.
3. Reset the engine control module (ECM) by disconnecting the car’s battery for a few minutes. This can clear any temporary faults.
4. Verify the thermostat operation. A faulty thermostat can trigger the P059f code. Replace if necessary.
5. If the issue persists, it is recommended to consult a professional mechanic or use a diagnostic tool for further troubleshooting. They can perform more advanced tests and pinpoint the exact cause of the code.

What steps should I follow to troubleshoot and fix Code P059f on my vehicle?

To troubleshoot and fix Code P059f on your vehicle, follow these steps:
1. Use an OBD-II scanner to retrieve the trouble code P059f. This code indicates a problem with the thermostat heater control circuit.
2. Inspect the wiring and connections of the thermostat heater control circuit for any damage, loose or corroded connections.
3. Test the resistance of the thermostat heater circuit using a multimeter. The normal range should be specified in your vehicle’s service manual.
4. If the resistance is out of range, replace the thermostat assembly that includes the heater element.
5. Clear the trouble code and test drive the vehicle to ensure the issue is resolved.

Note: It is recommended to consult a professional mechanic or refer to your vehicle’s service manual for specific instructions and diagnostic procedures.

Are there any common solutions or known fixes for Code P059f that I can try?

Yes, there are common solutions and known fixes for Code P059f that you can try.

In conclusion, fixing Code P059f can be a daunting task, but with the right approach and a clear understanding of the issue, it is possible to resolve it effectively. Remember to diagnose the problem accurately by thoroughly inspecting the circuits, connections, and sensors involved. Once you have identified the faulty component, replace it if necessary, ensuring it is compatible with your vehicle’s specifications. Additionally, resetting the error codes using a professional diagnostic tool may be required to clear the stored fault codes. Finally, conduct a thorough test drive to ensure that the issue has been successfully resolved and that the Code P059f no longer appears. By following these steps, you can confidently overcome the Code P059f challenge and get your vehicle back on the road in optimal condition.

James Fixman
Written By

James, a seasoned DIY enthusiast and problem solver, is the driving force behind HowToFix.ONE. With a knack for fixing everything from household appliances to automobiles, James shares his wealth of knowledge to help readers navigate the world of DIY fixes. His practical advice and step-by-step guides demystify the process of repair and maintenance, empowering everyone to become their own handyman.

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