P1506 code — how to fix error fast

OBD2 codes like P1506 can be pretty unnerving, especially if they come followed by an odd idle RPM range or “check engine” light on the dash. If you happen to get this code via a diagnostic scan, our team will help you deal with it as we go through every possible reason behind the code and discuss diagnostic methods you can use.

This way you’ll be more familiar with the P1506 code meaning and you’ll be able to find a perfect option for fixing the code. To help you even more, we’ll also lead the way in properly clearing the code and preventing it from occurring again.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P1506 code mean?

The P1506 code is a generic code that means the idle air control system or idle speed control system is out of range. The idle speed control system is responsible for regulating the engine’s idle speed. When this system is not working correctly, the engine may idle too high or too low, causing drivability issues. \

Some of the consequences of the P1506 code include decreased fuel efficiency, poor engine performance, and difficulty starting the vehicle. The most common symptoms of the P1506 code include rough idling, stalling, and engine misfires.

What causes the P1506 code?

While the fluctuating RPM range when idle is the main consequence of this code, you’ll have to know more about the core reasons for it to find an appropriate fix. That’s why we wanted to give you a complete take on some of the most common causes of this code:

Faulty idle air control valve

The idle air control valve is responsible for regulating the engine’s idle speed by controlling the amount of air that enters the engine when the throttle is closed. When the valve is faulty, it can cause the engine to idle too high or too low.

Dirty throttle body

The throttle body is responsible for regulating the amount of air that enters the engine. When it becomes dirty, it can restrict the airflow, causing the engine to idle too high or too low and triggering the P1506 code.

Vacuum leak

A vacuum leak can cause the engine to idle too high or too low, which may lead to the code’s activation The leak can be caused by a cracked or damaged vacuum hose, intake manifold gasket, or other components.

Wiring issues

Wiring issues can cause the idle air control system to malfunction, so this could lead to the P1506 code. The wiring can become damaged or corroded over time, leading to connectivity issues.

Which car models does the P1506 code affect the most?

While the P1506 code can appear on any vehicle, some car models are more likely to be affected than others. Ford vehicles seem to be more exposed to this code than others, so here’s a brief overview of the most exposed vehicles:

• Ford Taurus: This large sedan by Ford is affected by the code due to issues with the idle air control system in most model years.
• Ford Windstar: Like the Taurus, the Windstar also has issues with the IAC system along with common vacuum leaks that were reported by drivers and previous owners.
• BMW 335i: The E90 BMW 3 Series model is also affected by this code due to throttle body contamination issues and vacuum leaks.

How to diagnose the P1506 code

To diagnose the P1506 code, you will need specialized diagnostic tools, such as a scan tool or code reader. We wanted to go one step further in giving you an overview of the steps to diagnose the code and give you some methods that don’t require specialized tools, so here’s a complete list:

Check for other codes

Before diagnosing the P1506 code, check for other codes that may be present. Other codes can provide clues to the root cause of the problem and this way you can have more insight into what may have caused the code in your car.

Check the IAC valve

The next step is to Inspect the idle air control valve for signs of damage or wear. This valve can often get worn or stuck which causes improper air supply to the engine and may lead to the code’s activation.

Inspect the throttle body

A dirty throttle body is one of the most common reasons behind the code P1506 and the best way to check if that’s the case with your car is to examine it and see if it needs some cleaning.

Check for vacuum leaks

Inspect all vacuum hoses, intake manifold gaskets, and other components for signs of damage or wear. Repair or replace as necessary.

How to fix the P1506 code

Once you’ve determined the root cause of this code and issues with it, you can use that to your advantage. Since there are various methods of repairing the issue behind the code, things get much easier when you know where to look, so you can apply one of these methods:

Clean the IAC valve

Over time, the IAC valve can become clogged with dirt and debris. Cleaning the valve can help restore proper airflow and fix the P1506 code.

Replace the valve

If cleaning the valve doesn’t work, replacing it may be necessary. A new IAC valve can ensure that the proper amount of air is flowing through the engine.

Inspecting the throttle body

The throttle body is another component of the engine that can cause airflow issues. Checking for any damage or wear and tear on the throttle body can help identify the root cause of the P1506 code.

Repairing vacuum leaks

Vacuum leaks can cause problems with airflow and trigger the P1506 code. Inspecting and repairing any vacuum leaks can help resolve this issue.

How to prevent the P1506 code

Once you’ve successfully repaired the issue and cleared the code, it takes knowing the right steps to take for further code prevention. We would hate to see you struggle with this code again, so here are some steps to take to prevent that:

• Perform regular throttle body cleaning
• Checking for vacuum leaks
• Replacing the spark plugs on time
• Using high-quality fuel

If you are unsure how to diagnose or fix the P1506 code, seek professional help. A trained mechanic can diagnose and fix the issue quickly and efficiently.

Our take

The thing with this code is that it’s a common issue that can affect any vehicle. By understanding the code’s meaning, potential causes, symptoms, and fixes, you can diagnose and fix the issue quickly and efficiently.

Following the preventative measures outlined in this article can help prevent the code from appearing in the future, ensuring your vehicle runs smoothly and efficiently.