Honda Accord P0507: Idle Air Control – RPM Higher than Expected

P0507 This is an OBDII common trouble code. The code will be triggered if the engine idle speed exceeds 200 RPM or the manufacturer's predetermined limit. The generic code means it is the same as the other codes. Honda Accord Like any other vehicle.

P0507 Symptoms

P0507, unlike many OBDII codes, will usually be visible to you while driving. The following are symptoms of the Accord.

• Coming Soon: Service Engine Light– The reason why you are here.
• Accelerate Idler Speed– Assuming that the code has been thrown due to a legitimate issue, you should notice the engine running faster when not pushing the gas.
• Thud Going Into Drive– Transmissions really don’t like to shift from park to drive at an RPM higher than idle. When you put your vehicle into P0507, it is not uncommon to feel the entire car jerk.
• Vehicle takes off faster– With the engine idling higher, people report feeling the vehicle take off when releasing the brake pedal. Driving can become more hazardous.

Honda Accord P0507 Causes & Diagnosis

Many possible causes of P0507 exist. While the code specifically mentions the “Idle Air Control System”, it would be a mistake to just go ahead and replace it without a little due diligence. The code is not always caused by the idle air control valve.

Below are some common reasons for P0507 on the Honda Accord. Also, we have a waist-to-treat them. There are many model year differences. You might start with looking at a Vacuum leak You can then move on from there.

Vacuum Leak

Leaking vacuum systems can cause the Accord's idle to be higher. The vacuum system can leak, allowing more air into the combustion chamber. The extra air allows for slightly more combustion and increases RPM. It also throws the code.

How do you find a leak in your vehicle's vaccum? (Popular Mechanics, Article)
In less than a minute, how to find a vacuum leak (2CarPros, YouTube)

Vacuum leaks can be caused by bad things vacuum hoseThe Take in a lot, EGR SystemOr anywhere air can flow through. It’s not hard to find a vacuum leak though. Use the resources above and you’ll find it in no time.

Valve for Idle Air Control

The majority of modern fuel injected engine are fitted with an idle air control valve. However, not all are. If you have determined that you don’t have a vacuum leak, the IAC is a great second place to troubleshoot P0507.

How to diagnose an IAC valve (Autozone Guides)

Throttle body

The throttle body can be opened and closed millions of times during the lifetime of a car's engine. It can collect dust from all the air passing through it. It can alter the characteristics of your vehicle's idle. When dirty, you’ll often feel the vehicle almost stall before the computer compensates and opens it a little more.

Alternativly, the code could be thrown if it is not functioning properly due to damage to the throttle body.

How to spot signs that your throttle body is going down (Repair Pal)
How to tell if your throttle is bad or dirty (YouTube Auto Repair Youtube)

Conclusion

The P0507 problem is serious. Due to the unsafe nature of driving with an engine that is revving higher than it’s supposed to, we recommend having your Accord serviced as soon as possible. You're welcome!