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Dodge Dakota P0507: Idle Air Control – RPM Higher Than Expected

 

P0507 Dodge Dakota

P0507 It is a fairly typical OBDII fault code. It is usually activated when the engine idle speed exceeds the limit predetermined by the manufacturer by 200 rpm or more. It is a generic code, which means that it is the same for the Dodge Dakota like any other vehicle.

P0507 Symptoms

Unlike many OBDII fault codes, P0507 is usually noticeable to you when driving. These are the typical symptoms of Dakota:

  • Service engine soon light– The reason you are here.
  • Faster idle speed– Assuming the code was thrown due to a legitimate issue, you should notice that the engine runs faster when you don’t step on the accelerator.
  • Water hammer when starting– Transmissions don’t like to shift from park to drive at higher rpm than idle. It is common to feel that the entire vehicle jerks when starting with P0507.
  • The vehicle starts faster– With the engine at a higher idle, people report feeling the vehicle take off when they release the brake pedal. This can make driving more dangerous.

Dodge Dakota P0507 Causes and Diagnosis

There are many potential causes for P0507. Although the code specifically mentions the “Idle Air Control System,” it would be a mistake to replace it without a little diligence. The idle air control valve is usually not the cause of the code.

Here are some of the most common causes of P0507 on the Dodge Dakota, as well as how to fix them. Please note that there are differences in model years. It would be a good idea to start by looking for a vacuum leak and move forward from there.

vacuum leak

A leak in the vacuum system often causes the Dakota to idle. When the vacuum system leaks, it allows extra air to enter the combustion chamber. This air allows for slightly higher combustion, increases RPM and throws the code.

How to find a vacuum leak in a vehicle (Popular Mechanics(Article)
How to Find a Vacuum Leak in a Minute (2CarPros, YouTube)

A vacuum leak can come from a bad vacuum hose he intakes manifold, the EGR system or anywhere else air passes through. However, it is not difficult to find a vacuum leak. Use the resources above and you will find it in the blink of an eye.

Idle air control valve

Most modern fuel-injected engines are equipped with an idle air control valve. But not all of them are. If you have determined that you do not have a vacuum leak, the IAC is a good second place to troubleshoot P0507.

A typical idle air control valve

How to Diagnose an IAC Valve (Autozone Guides)

throttle body

A throttle body opens and closes millions of times in the life of a vehicle. All the air passing through it can cause dirt to slowly build up. This dirt can change the idling characteristics of the vehicle. When it’s dirty, you’ll often feel like the vehicle almost stalls before the computer compensates and opens it up a little more.

A typical throttle body

On the other hand, if the throttle body is damaged, it may not regulate airflow properly, and the code may appear.

Signs that the throttle body is going bad and what to do (Repair Pal)
How to tell if your throttle body is dirty or bad (YouTube Auto Repair, Youtube)

Conclusion

P0507 is a serious problem. Due to the unsafe nature of driving with an over-revving engine, we recommend that you have your Dakota serviced as soon as possible. Good luck!

 

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