Code P0743: Torque Converter Clutch (TCC) Solenoid Circuit Electrical

If you have a problem with your car and take it to the mechanic, the mechanic is going to check what error codes the vehicle is sending. This tells the mechanic what is wrong with the vehicle, which aids in diagnosing and fixing the problem. If you have the tool used to read the error codes, you can try to save some money by taking a crack at fixing it yourself. It is vital to realize that the error code only tells you what the problem is. It does not tell you what is causing the problem or how to fix it. On top of this, you will need to interpret the error code. The scanner will simply tell you something like, "OBD-II scanner error code P0743 problem." This guide will explain what the code means, but if you hope to take care of it yourself, you will need good automotive understanding and technical skill.

What Does the Error Mean?

The first thing you need to answer is what does the code P0743 mean? This error code indicates that something is wrong with the torque converter clutch solenoid electrical circuit. If you are like most people, you will have no idea what that means, but that is okay. The torque converter clutch is a component in automatic transmissions. It helps transfer the energy of the engine to the transmission. In the process, the torque converter clutch mitigates the buildup of excess heat and saves on fuel economy.

It is not too important to have anything more than a basic understanding of what the torque converter clutch does, because the error code does not actually indicate an issue with it. Instead, the P0743 error code indicates that there is a problem with the circuitry that the powertrain control module uses to control the torque converter clutch.

Possible Symptoms

If your car is giving the P0743 error code, there are a few symptoms you should expect to see. Paying attention to the symptoms can help you diagnose the issue. Besides the check engine light turning on, you may see:

  • The engine stalling out when stopping
  • Bad fuel economy
  • Shuddering when starting or stopping

The Danger of Ignoring it

Having your car stall out and turn off when you come to a stop is not only inconvenient, but dangerous too. You should consider this error code to be severe and take steps to fix it immediately. Additionally, the problem that causes this error code may go on to cause more significant and expensive damage.

Try These Solutions

The question that’s probably at the forefront of your mind is, “How do I fix trouble code P0743?” The best way to fix a problem is to start with the simplest solution and work toward the worst case scenario. Sometimes low transmission fluid can cause the issue, which may have a simple fix. If putting more transmission fluid in does not solve the issue, try changing the transmission fluid out. If that still does not solve the issue, you should next check for an electrical problem. Check the powertrain control module and torque converter clutch for frayed wires or damaged circuitry. If you find anything, either repair or replace the damaged part.

If you still have not discovered the issue, it is time to start looking for mechanical failure, which is harder to fix than fluid levels or electrical issues. First check the external harness and connectors on the torque converter clutch. After that, check the torque converter clutch itself. Finally, if nothing else checks out, you need to consider a computer issue. You can get updated software from your dealer. If it is none of these issues, you probably have a faulty PCM.

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