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P0597 is a diagnostic trouble code (DTC) for "Thermostat Heater Control Circuit/Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0597 trouble code signifies that a thermostat heater control circuit is open.
If a PCM (Powertrain Control Module) stores this code, it’s because the engine’s thermostat is experiencing an issue with the control voltage. The control circuit is most likely either open or short. This thermostat is used to monitor the temperature of the engine and make adjustments to ensure it doesn’t overheat or suffer from other possible problems. Related codes are P0598 and P0599. The only difference between these three pertains to the make and model of the car. P0597 are used by German manufacturers like Mercedes, BMW, Volkswagen, Mini, Jaguar and Opel.
The problem behind P0597 could be a number of things. However, more often than not, you’ll find that it was stored because of an issue with the electrical connector. Check to see if it’s corroded or loose. Otherwise, the issue could be:
For the most part, code P0597 probably won’t cause any noticeable symptoms. Aside from the Check Engine light coming on, you may notice that your vehicle’s temperature gauge is reading abnormally high. Conversely, it could be showing a lower temperature than normal. It depends on what position the thermostat was in at the time of its failure. That being said, if the thermostat fails when the engine is cool, the vehicle runs a pretty good chance of overheating. Unfortunately, the driver probably won’t notice anything until it's already too late.
Diagnosing the P0597 code problem will entail:
A lot of mechanics go right to replacing the entire electronic thermostat. This may often solve the problem, but it’s not always necessary to do away with the whole thing either. Sometimes, the system circuitry is the real problem. Then, however, mechanics need to be careful to not just clean off or repair corroded wires, but also look for the source of this corrosion. An engine coolant leak is most likely the culprit. This will have to be repaired or the problem will repeat itself.
It’s not a serious problem insofar as it doesn’t represent a threat to the driver’s life. That being said, there’s a reason the thermostat is tasked with gauging engine heat and it’s because too much and the vehicle will quit performing. Worse yet, overheating can sometimes destroy the engine, which would lead to a costly replacement. For this reason, the problem shouldn’t be allowed to persist for long.
The most common repairs for the P0597 code include:
The P0597 code is the reason why drivers need to pay attention to their vehicles. If the hood of the vehicle feels hot to the touch after normal operation, but no Check Engine light came on, they should know something is wrong and they need to see a mechanic.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.