P0598 - OBD Trouble Code

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The P0598 code identifies a problem with the control circuit for the thermostat heater. The fault code P0598 can be identified as Thermostat Heater Control Circuit Low. The P0598 code is related with the P0597 and P0599 codes.

Want to learn something more about this fault code?

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the Thermostat Heater Control Circuit Low?

• Failure in the thermostat
• Defective motronic computer
• The wiring harness between the computer and thermostat might be short or open
• The connector on the thermostat might be loose or corroded
• Coolant might start leaking

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2. Thermostat - There can be some issues with the Thermostat due to which you may see P0598 code appearing over and over again. Visit us to buy best quality Thermostat online.
3. Engine Control Module - Are you facing some faults in your Engine Control Module? Don’t worry and get them replaced or else P0598 code can turn up.
4. Engine Coolant Temperature Sensor - Common cause behind this P0598 error code can be some fault in Engine Coolant Temperature Sensor. So, it will be a good decision to replace them now.
5. Powertrain Control Module - Engine Coolant Temperature Sensor is perfectly fine but still but having that trouble code P0598 flashing? In such a situation your Powertrain Control Module might be faulty. Why don’t you think of getting that replaced?

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0598 here:

Common Symptoms

• Illumination of the check engine light
• The temperature gauge may read abnormally high if the thermostat failed in the partially closed position, conversely, it will read lower than normal if the thermostat failed in the fully open position

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0598:

• The powertrain control module should be replaced properly
• Make sure to replace or replenish coolant in engine
• You must repair or replace the wiring harness around thermostat
• It is very important to replace the thermostat heater

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

Firstly, remove and inspect the electrical connector. Remove any corrosion using baking soda or by scraping. Apply electro grease and confirm a tight connection

The coolant level in the radiator should be inspected properly. Low levels of coolant will set a code by causing the electronic thermostat to overheat

Remove the electrical connector and check the resistance values on the thermostat. For this procedure you will need a service manual or the necessary information found online

This information needs to include the identification of the pins and their location, color of the wires, pin values in volts at specific temperatures and resistances. These values and flow of diagnosis varies from manufacturer to manufacturer and with engine size

You will require an infrared temperature probe and volt/ohmmeter. Carefully determine the temperature of the engine with the temperature probe

Start the engine and test the voltage on the motronic side of the harness as per the instructions. If it is within limits continue testing. If there was no voltage or it was out of range, replace the motronic unit

Compare the resistance on the thermostat side of the harness at the thermostat. If the resistance is out of range replace the thermostatic unit. If you find out that the tools are not readily available, take the vehicle to a good shop that has access to the necessary information

Common Mistakes When Diagnosing The P0598 Code

• The mechanic may change the right components of the thermostat while diagnosing the P0598 trouble code, but in reality, the main issue lies in the electronic components surrounding the unit
• Due to this a lot of money might be unnecessarily wasted in the costly repairs and the replacement of functioning components