![]() Apply electro grease and confirm a tight connection. Remove any corrosion using baking soda or by scraping. Remove and inspect the electrical connector.A short or open has occurred in the wiring harness between the computer and thermostatĭiagnostic and Repair Procedures for P0597 Code.A coolant leak will cause the code to set.A loose or corroded connector on the thermostat.Occasionally, the Motronic (engine management) computer fails, but is the least likely cause. 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 full open positionĮxperience dictates that the problem usually lies in a loose or corroded electrical connector or the electrically operated thermostat itself is at fault.The check engine light will illuminate and one of the above codes will be set.Symptoms will vary depending on the position of the thermostat at the time of failure, however, it is unlikely that there will be any noticeable difference in the operation of the vehicle. The electronically controlled thermostat consists of various temperature and load sensors, a computer program and the control housing with a built-in thermostat.īy controlling the coolant flow or engine temperature electronically, part throttle increases fuel economy and reduces emissions, whereas reducing the temperature under load increases power. For the most part, German manufactured vehicles such as BMW, Mercedes, Audi, Mini, Volkswagen, Opel and Jaguar use this system. ![]() The P0597 engine code indicate a fault has occurred with this system where the control voltage is nonexistent. Therefore, this trouble code article is basically identical for all three codes. They are generic codes, meaning they pertain to all vehicles using this type of thermostatic control, however, only a small number of manufacturers employ this type of system. The codes P0597, P0598 and P0599 all refer to an electronically controlled engine thermostat. However, specific troubleshooting steps will vary depending on the vehicle. This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. Thermostat Heater Control Circuit Open What does that mean? ![]() OBD-II Trouble Code Technical Description
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