Regarding Kia vehicles, one of the most common issues encountered is the code P0685, also known as an ECM/PCM Power Relay Control Circuit/Open. This code appears when the engine runs with an ignition voltage less than or equal to 11 volts. The cause of this code is varied and can include a poor connection, an open or short to the control circuit, a faulty main relay, or a defective PCM. To get to the root of the problem, it’s important to understand the causes and solutions for this code. The following table outlines some of the most common causes of code P0685 and the solutions available to fix them.
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Causes and Solutions for Kia Code P0685
| Cause | Solution |
|---|---|
| Poor connection | Check all electrical connections and replace them if necessary |
| Open or short to in-control circuit | Check all circuits and use a multimeter for open or short circuits. |
| Main relay | Replace the main relay with a new one |
| PCM | Replace the PCM with a new one |
When the check engine light comes on with Kia code P0685, understanding the causes and possible solutions can be challenging. This code usually appears when the engine is running with an ignition voltage less than or equal to 11 volts, and the problem is often caused by a poor connection, an open or short to the control circuit, a faulty main relay, or a defective PCM.
It is important to consider the causes and solutions outlined in the table below to diagnose and repair this issue properly. With the right information and tools, the root of this problem can be identified and addressed quickly and easily.
Poor Connection
A poor connection is one of the most common causes of Kia code P0685. To determine if this is the issue, it is important to check and replace all electrical connections if necessary. This can help ensure all connections are secure and the code does not reappear.
Open or Short to Control Circuit
Another possible cause of Kia code P0685 is an open or short to the control circuit. To check for this, it is important to use a multimeter to test all circuits and ensure that there are no open or short circuits. If any circuits are found to be faulty, they should be replaced to ensure the issue is resolved.
Main Relay
In some cases, the main relay may cause Kia code P0685. If this is the case, replacing the main relay with a new one is important. This can help ensure that the code does not reappear and the issue is properly resolved.
PCM
Lastly, a defective PCM can also cause Kia code P0685. If this is the issue, replacing the PCM with a new one is important. This will help ensure the code does not reappear, and the issue is resolved properly.
Conclusion
Kia code P0685 is a common issue that many issues, including a poor connection, an open or short to the control circuit, a faulty main relay, or a defective PCM, can cause. To properly diagnose and repair this issue, it is important to consider the causes and solutions outlined in the table above. With the right information and tools, the root of this problem can be identified and addressed quickly and easily. Understanding the causes and solutions for Kia code P0685 can help ensure that the problem is properly managed and that the code does not reappear.