The engine code P0505 means that your idle control system or idle air control valve is not functioning properly. Have your engine inspected right away to keep problems from developing, like your vehicle stalling.

Diagnostic trouble codes (DTCs) are one way for your car to notify you of a problem within the engine. To be able to read engine codes, as DTCs are more commonly known, you need to have an OBD-II code reader. Luckily, your mechanic should already have one and the skills to quickly diagnose the cause of the engine code.

To find the source of the engine code and how to fix it, you’ll first need to understand the meaning of it. That’s why

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What does the engine code P0505 mean?

Definition: idle control system malfunction

A P0505 engine code indicates a problem with either the idle control system or the idle air control valve (IAC) on/near the throttle body. These parts are critical for maintaining the throttle speed of your engine while it idles by controlling the volume of air allowed into it.

How much will it cost to fix?

If the idle air control valve is the source of the engine code, replacing it can cost $70-$400+, depending on the make and model of your car.

Diagnosing the exact source of a P0505 DTC should take a mechanic no more than an hour. The cost of labor depends on the auto shop, but generally speaking, you’re looking at a starting bill of $75-$150 per hour.

Because the cost of labor and parts is so dependant on location and the make and model of your car, a total bill for fixing a P0505 engine code can range from $145-$550+. Expect a higher repair cost if the source of the code is difficult to find or other parts need replacing.

What can cause the P0505 engine code?

A P0505 DTC is caused by a malfunction in the parts that control airflow into the idling engine. Most of the time, the culprit is a worn or damaged idle air control valve.

When an engine idles, the idle control system works to maintain the optimal engine throttle. It does this by opening or closing the idle air control valve mounted on or near the throttle body. Too much air will cause the engine to work harder than it needs to. Too little air will lead to the engine stalling.

Unfortunately, though the idle air control valve is often to blame for a P0505 engine code, it’s not the only possible cause. Some other sources of a DTC P0505 are:

An open or shorted IAC harness

A poor electrical connection to the IAC circuit

A problem with the powertrain control module (PCM)

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Common symptoms of the P0505 engine code

The P0505 engine code will be set when the IAC valve is not operating properly. One of the first signs of this will be the check engine light turning on. However, some other things to be on the lookout for are:

The engine having trouble starting

Rough or erratic idle speed

Vehicle stalling

How serious is the P0505 engine code?

Proper airflow into your engine is critical for your vehicle to function properly. If you find a P0505 engine code or notice symptoms of one, you need to have your mechanic inspect your vehicle right away.

An engine not getting the air it needs will either work too hard or stall. That could mean being stranded somewhere in the short term or engine parts wearing out in the long term. To avoid needing to tow your car or replace engine parts prematurely, don’t wait to fix a P0505 engine code.

Can I fix the P0505 engine code myself?

Because a DTC P0505 can be caused by mechanical, electrical, or software problems, it can be difficult to fix on your own. If you don’t feel confident about your car skills, take your car to a professional.

Inspecting the exhaust camshaft position actuator solenoid

If you have the necessary skills and want to check your car for a quick fix you can do yourself, follow these steps:

Inspect the idle air control valve’s (IAC) wiring harness and connectors

Check for damage to the IAC

Look for broken, bent, pushed out, or corroded connector’s pins

If the DTC is still displayed after you’ve followed these steps, you need a professional.

MORE: How to teach basic car maintenance to your teen

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