car throttle body

P0507 Code: Idle Control System (IAC) RPM Higher Than Expected

In OBD2 Trouble Codes by Magnus Sellén1 Comment

Is your check engine light flashing on your cluster and you have found the P0507 error code in the memory of your engine control unit?

What does this mean and how advanced is it to fix the problem? Which part should I replace and in what order should I start looking for the problem?

In this article, you will learn the symptoms, causes and solutions and how to get rid of this error code as quickly as possible.

What does the P0507 code mean?

engine light

The P0507 trouble code is triggered when the idle control system RPM is higher than expected. All modern engines have a desired idle speed, normally between 600 and 1000 RPM. The control unit uses active monitoring and adjustment of the throttle body to achieve these speeds. If the idle speed exceeds these values and the maximum settings of the engine control unit, the control unit triggers this as an error code.

Code P0507 is a common code for vehicles equipped with an electronic throttle body. Newer cars normally use an electronic throttle body.

An electronic throttle body is exactly as it sounds: it is electronic instead of the old throttle bodies with wires between the accelerator pedal and the throttle body. An electronic throttle body uses sensors on the accelerator pedal and an electric motor in the throttle body to give you the acceleration you want. However, this does not mean that this fault code must be a faulty throttle valve, it can also have a lot of other causes.

P0507 Symptoms

The most common symptom of this trouble code is that you will notice that your idling RPM is higher than usual. You will probably also notice the check engine light on your dashboard. You may also have other symptoms such as misfiring and rough idling and acceleration if it is a lean/rich mixture that is triggering the P0507 code.

  • High Idle RPM
  • Rough Idle
  • Jumping Idle
  • Check Engine Light
  • Rough Acceleration
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Possible P0507 Causes

  • A vacuum/intake leak (most common)
  • Faulty/Stuck EGR (Exhaust Gas Recirculation)
  • Faulty PCV valve (Positive Crankcase Ventilation)
  • Faulty/Damaged/Dirty Throttle body
  • Faulty EVAP (Evaporative Emission)
  • Faulty IAC (Idle Air Controller)
  • Faulty Power Steering Switch
  • Faulty Accelerator Pedal

Possible P0507 Solutions

  • Fix Vacuum/air leaks (First step)
  • Clean the throttle body (Second step)
  • Basic Setting / Reset adaptions of the throttle body (Third Step)
  • Replace PCV Valve
  • Replace EVAP vent valve
  • Replace IAC
  • Replace Throttle body
  • Replace Power Steering Switch
  • Replace Accelerator Pedal
  • Repair Possible Wiring Issues

How to diagnose the P0507 code

This method of diagnosing the code is used by most professional mechanics. For these tasks, you may need some necessary tools to perform quick and easy troubleshooting. Always connect a car charger before connecting your OBD2 scanner and other diagnostic tools. Low voltage can damage your ECUs and cause faults.

1. Connect an OBD2 Code scanner, check the P0507 code, and look for other code errors.

2. Check the live data of the idle control valve/throttle body to see if it is correct. Check the accelerator position sensor to make sure it is correct.

3. If no other error codes are stored, check the intake system for any vacuum leaks and listen for them. If no vacuum leaks are visible or audible, you can use a starter spray or other flammable spray and spray it carefully around the intake when idling. If the engine RPM increases when spraying, you have a leak somewhere in that area. Remember to do this with caution and always have a fire extinguisher near you. Professional mechanics use smoke machine leak testers to find this kind of fault very quickly and easily without any risk of fire.

4. If no leaks are detected, check if the throttle body is dirty inside. If you find that it is dirty, remove the throttle body if possible and clean it with brake cleaner or another strong detergent. Make sure that it is 100% clean.

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5. After cleaning the throttle body, you usually have to do a basic adjustment and reset of the throttle body to learn the new values of the clean throttle body. You can do this with an OBD2 code scanner. The cheapest OBD2 scanners cannot do this and depending on the vehicle model you may need a high-quality OBD2 scanner. Always ensure that the OBD2 scanner is compatible with your vehicle before making a purchase.

6. Erase the P0507 code and go for a test drive to verify that the code is no longer present.

7. If the P0507 code still comes back, continue diagnosing EVAP, IAC, EGR, PCV valves, etc. These procedures are more advanced, so contact us if you have any questions.

Recommended Tools to Fix P0507

To Read the Trouble code memory: FOXWELL NT301 Scan ToolFor basic settings and adaptions, you may need a more advanced OBD2 code reader

Find Air/vacuum leaks: STINGER Brand EVAP Smoke Machine Leak Tester

Car Battery charger: NOCO Genius G3500 6V/12V Smart Battery Charger

If you have further questions about the P0507 code, please comment below and I will answer you as soon as possible. If you have further questions about cars, you are welcome to ask them on our homepage.

To find all OBD2 codes. Check our OBD2 Code List.

1 thought on “ P0507 Code: Idle Control System (IAC) RPM Higher Than Expected ”

Comments
  1. Hi getting code p0507 changed the crankcase breather hose changed iac cleaned throttle body New pcv valve drove 600 miles and code came back on .About 4 months ago changed gas tank and had to jb weld the overflow nipples on tank can this be the problem it’s 04 Dodge ram 1500 4.7 ltr any suggestions thanks

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