Code P0507: Top Causes and Solutions to This Diagnostic Code

Code P0507 appearing in your scanner indicates that your car’s engine RPM at idle is higher than the manufacturer recommends. Of course, each manufacturer has their parameters for the recommended range of idle speed.

Code P0507 ~ Ran When Parked

In this post, you will learn the top causes and solutions to the P0507 trouble code.

Why Is Your Car’s Onboard Diagnostics Throwing Code P0507?

Your car’s onboard diagnostics is throwing P0507 diagnostic code because the ECM detects engine idle is higher than expected. The top trigger for this fault code is a faulty idle air control (IAC) system. A malfunctioning IAC system can allow excess air into the engine causing high idle.

When you have a faulty IAC, your car can throw this fault code. This happens for a number of reasons. First, a faulty IAC valve may stay open allowing excess air into the engine when idling. The excess air interferes with the right air-fuel mixture necessary for a smooth idle.

Code P0507 Conclusion ~ Ran When Parked

In an attempt to restore the proper air-fuel ratio, the ECM will allow more fuel which can make the idle rpm higher. As a result, it will trigger the P0507 code.

Second, if the IAC sends the wrong feedback to your car’s ECM, it can throw this error. This happens when the ECM adjusts the throttle position to compensate for what it detects is the correct idle speed. When this happens, it can result in elevated idle speed that is beyond the recommended range.

Lastly, when you have a malfunctioning IAC valve it can result in erratic idle speed. This will occur as the engine struggles to restore consistent idle. In all these cases, when the ECM detects your car’s idle speed is consistently higher than expected, it will trigger trouble code p0507.

It is worth noting that the fault code can appear in any vehicle. You can see it as P0507 Honda, P0507 Hyundai Tucson, P0507 Volvo, P0507 Jeep, P0507 Audi, and P0507 Infiniti.

Vacuum Leaks: The Unseen Culprit Behind Code P0507

Another significant trigger for code P0507 is a vacuum leak. When you have such leaks in your engine, it means the vacuum system allows unregulated air to enter the combustion chamber. This is common in some engines that use cheap rubber gaskets.

With time, these gaskets harden allowing unmetered air to leak into the chamber. Such leaks result in various issues that result in high idle which triggers this fault code.

Why Car’s Onboard Diagnostics Throwing Code P0507 ~ Ran When Parked

For instance, the uncontrolled airflow into the combustion chamber bypasses the mass air flow (MAF)sensor. As a result, the ECM has no way of adjusting for the extra air which interferes with the air-fuel balance.

When your car runs in an extremely lean air-fuel mixture, the engine will try to run faster to compensate for the lack of fuel. Eventually, this will result in a higher rpm at idle.

As well, the extra air arising from vacuum leaks can result in erratic idling as the engine speed fluctuates. Once the ECM detects high than normal idling, it will trigger code P0507 to alert the technician of this issue.

Dirty Throttle Body Can Trigger Diagnostic Code P0507

If your car has a dirty throttle body, it could be the reason you are seeing this fault. With time, carbon deposits, dirt, and oil residue can gather on the throttle body surfaces. These include the throttle plate and its housing. The accumulation can interfere with the throttle plate movement hindering its ability to control the flow of air.

Once the throttle body accumulates dirt, the throttle plate can stick or move slowly. Eventually, this decreases the ability to accurately control the air entering the engine. As such, it will be unable to properly control your car’s idle.

For instance, dirt in the throttle body can make the throttle plate remain open slightly when it is supposed to be closed. The unintended airflow can result in high idle rpm beyond the recommended range. In addition, dirt can slow the throttle response which affects idle control contributing to the high idle.

Your car’s ECM will detect the consistently high idle condition which exceeds the recommended range. It will interpret this as a deviation from the normal speed and then trigger this engine code.

Faulty Throttle Position Sensor (TPS) Can Elevate Idle RPM

Another potential trigger for this fault code is a faulty TPS. When your car has a malfunctioning TPS, it means the sensor can send incorrect signals to the ECM about the position of the throttle. When this happens, it can result in high idle RPM.

For instance, when a faulty TPS provides inaccurate signals it can cause the ECM to detect that the throttle is open. As a result, the ECM can allow more air into the engine which results in elevated RPMs at idle.

In addition, erratic TPS signals can lead to unstable engine idle with abnormally high RPM fluctuations. Moreover, a malfunctioning TPS can result in throttle response delays which affect the ECM’s ability to control the throttle during idle. Eventually, when the ECM detects a deviation in the normal idle RPM, it will throw this fault code.

Faulty Power Steering Pressure Switch Can Cause High Idle

Your car’s faulty power steering pressure sensor can trigger this fault code. For instance, when this sensor malfunctions it can inaccurately indicate an increase in load to the steering system. The ECM will detect the engine needs more power. As a result, this will increase the idle RPM as the ECM tries to compensate for the misinterpreted load.

The ECM relies on accurate signals to prevent stalling and provide power. Therefore, a failing pressure sensor can interfere with this compensation resulting in higher idling. The ECM will eventually detect the abnormal deviation of the idle RPM triggering this diagnostic code.

A Failing Positive Crankcase Ventilation (PCV) Valve

When you have a failing PCV valve it can trigger this diagnostic code alongside the dreaded check engine light. As it fails, this valve can result in improper ventilation which interferes with air intake and affects the air-fuel mixture. This can result in high idling which forces the ECM to trigger this fault code.

What Is the Best Solution to the Diagnostic Code P0507?

The best solution to the P0507 diagnostic code is cleaning the throttle body. This involves removing the throttle body and carefully cleaning its components. As a result, you restore accurate control of airflow during idle. This in turn eliminates this fault code.

Best Solution to the Diagnostic Code P0507 ~ Ran When ParkedAs well, removing dirt maintains the correct air-fuel mixture for a smooth and efficient idle. In addition, when it is clean it eliminates irregular movement of the throttle plate that can result in an unstable idle.

However, if you are still getting the p0507 code after cleaning throttle body, then you should look at another root cause. It is worth noting that the estimated cost of clearing this code varies depending on your vehicle and what is causing it.

Replace Failing Idle Air Control Valve To Tame High Idle

You can also address this fault code by replacing a faulty idle air control valve (IAC) valve. Doing this restores accurate control of airflow which allows the ECM to effectively control your car’s Idle. For instance, a well-functioning IAC valve allows the ECM to accurately change the position of the throttle to maintain the recommended idle.

As well, restoring proper airflow optimizes your car’s air-fuel mixture. This will address the common symptoms of IAC valve issues such as rough idling. Once the ECM detects normal idle, it will stop throwing the P0507 fault code.

Inspect and Repair Vacuum Leaks To Revive Ideal Idle RPM

You can also address the P0507 fault code by inspecting and repairing vacuum leaks. To use this P0507 code how to fix solution, you first need to carry out a visual inspection. It is among the first things to do when you come across this code.

Start by thoroughly inspecting vacuum hoses and connections for signs of damage. Keep an eye on hose ends, junctions, and the intake manifold gasket.

The most popular technique for testing vacuum leaks includes the use of the smoke test or propane enrichment. Once you establish the issue causing these leaks, repair or replace the affected components. Make sure you seal the connections properly.

You may have noticed, that this requires technical know-how. Therefore, you should consider consulting a qualified mechanic to address this issue. The professional will inspect the vacuum leaks and make the necessary changes. This will address the root cause of this fault code.

Check and Replace Faulty Sensors To Address This Fault Code

Another way of effectively addressing P0507 is checking and replacing faulty sensors. There are several ways of establishing the sensors sending erroneous data. First, you can visually inspect sensor connections for damage or loose connections. The focus should be on these sensors TPS and MAF.

Second, test the sensor using tools such as a multimeter. Compare the readings with the manufacturer’s specifications. Once you establish a sensor is faulty, you need to replace it with a new high-quality one.

By replacing faulty sensors, you restore accurate and consistent transfer of data. This allows the ECM to properly adjust your car’s idling speed. As a result, ECM will no longer trigger the P0507 code.

Replace Faulty Positive Crankcase Ventilation Valve

Another way you can address this fault code is by replacing a faulty positive crankcase ventilation valve. This involves removing the valve from your car’s engine and installing a new one. To make this replacement you will need tools and skills to securely fit the new valve.

Alternatively, you can get a professional to replace the faulty valve. Once you are done replacing the valve, you will restore proper ventilation in the crankcase. This will maintain the right conditions for the smooth running of the engine.

Therefore, the new valve eliminates disruption that causes unstable idles. Thus, getting rid of the root cause of this fault code.

Replace Exhaust Gas Recirculation Valve- Restore Proper Idle

Replacing a faulty Exhaust Gas Recirculation (EGR) valve can also solve this fault code. Once you or a professional diagnose that the EGR valve is the root cause of this issue, you need to replace it. With the new EGR valve, your engine will have accurate recirculation of exhaust gases.

Replacing Exhaust Gas Recirculation Valve ~ Ran When Parked

This way, it will maintain the right combustion efficiency and idle. Thus, a new EGR valve will stabilize idling, eliminating the likelihood of the ECM triggering P0507. This will also clear the check engine light.


In this post, you have learned the various triggers and solutions to the P0507 OBD code.

To recap, here are the key takeaways:

  • Code P0507 comes up when your car has abnormally high Iddle RPM.
  • Top triggers for this code include faulty IAC system, vacuum leaks, dirty throttle body, Falty TPS, and failing positive crankcase ventilation valve.
  • To solve it replace failing IAC system components, replace faulty sensors, and repair leakages.
  • Other solutions are replacing a faulty EGR valve and a faulty PCV valve.
  • You can also consult a qualified mechanic.

With this knowledge, you can now take measures to address this fault code whenever it pops up.

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