The P0507 code triggers when your engine is idling too fast. More often than not, a high idle results from an air leak somewhere in your system. Identifying the exact source of the leak can sometimes be a bit tricky, however.
The drivability issues associated with the P0507 trouble code aren’t severe, but they can be annoying. You’ll want to repair the air leak as soon as you can once it’s cropped up. Read on below to learn more about what causes this problem and how you can fix it.
P0507 code definition
P0507 Code Definition (Generic): Idle air control system RPM higher than expected
P0507 Honda Code Definition: Idle air control system higher than expected
P0507 Nissan Code Definition: (IAC) system (RPM) higher than expected
P0507 VW Code Definition: Idle control system RPM higher than expected
What does P0507 mean?
There is a specific RPM range that your engine considers to be standard. This is between 600 and 800 RPM when idling for most vehicles, this can still vary depending on your make and model. You can find the exact range in your vehicle’s manual.
If the engine control module (ECM) detects that the car is idling at a higher RPM, it will trigger the P0507 trouble code. This code is often activated on cars with electronic or automatic throttle control. These vehicles use sensors for the throttle control rather than a traditional throttle cable.
The precise variance that triggers P0507 differs from one manufacturer to the next. For GMs, it’s set when the idling RPM is 200 or more over the standard range.
Like other generic DTCs, P0507 indicates the same issue in any vehicle. The steps for the repair can differ, however. Before you start in on any diagnosis, it’s a good idea to check if there are any recommended repairs specific to your vehicle. It is most commonly seen in Audi, Chevrolet, Honda, Hyundai, Jeep, Mazda, Nissan, and Volkswagen vehicles.
What are the symptoms of the P0507 code?
- Activation of the check engine light.
- Hard starts and stalls.
- Rough idle.
- Fluctuating or high idle.
- Rough or difficult shifts into drive.
What are the causes of P0507?
The most common causes of the P0507 trouble code sre:
- Leaks in the vacuum system
- Leaks in the air intake
- Faulty or clogged idle air controller (IAC) valve
The P0507 code can also be triggered by:
- A leak in the EGR valve.
- Faults in the EVAP system.
- Failed or faulty IAC circuit.
- Faulty positive crankcase ventilation (PCV) valve.
- A faulty electrical throttle control system.
- Faulty power steering pressure switch.
- Faulty, damaged, or dirty throttle body.
- Failed alternator.
How serious is the P0507 code?
The P0507 trouble code is of low severity. While you may have to contend with stalls and difficult starts until you fix the problem, you’re not at risk of causing long-term engine damage. It may be annoying to drive your car with this code active, but it will not be unsafe.
How to diagnose the P0507 code
Tools you’ll need:
- OBD2 scan tool
- Basic toolset (screwdriver, socket set, etc.)
- Throttle body cleaner
- IAC valve cleaner
- Scan your car for other trouble codes and read the freeze frame data. If there are other trouble codes present of higher severity, address those first.
- Inspect the vacuum hoses in your engine for leaks and damage. Make sure to feel along with hidden areas, and pay close attention to the ends for loose or frayed hoses. Don’t forget to check the intake pipe that connects the MAF to the throttle body.
- Start your car and idle the engine. Spray water on the intake. If the RPM drops, you have an intake leak in your system. You can direct the water at individual hoses to isolate the problem.
- Check the IAC valve and throttle body for carbon build-up. Clean them with the appropriate solution, following the directions on the bottle. Ensure the valve is opening and closing smoothly.
- Check the PCV valve, and clean it if it’s clogged or blocked.
- Test the operation of the IAC circuit. Start by disconnecting the negative battery terminal and unplugging the IAC connector. Use an ohmmeter to test the resistance of the valve. It should be 10-14 ohms. Test both between pins 1 and 2 and between pins 2 and 3.
- If your car has a throttle body cable, check its alignment. If it’s too tight, it can hold the throttle slightly open. Adjust as necessary.
Common mistakes to avoid while diagnosing the P0507 code
Don’t forget to check for carbon build-up throughout your system before replacing components. You may be able to clean your system rather than buying any new parts. A full, thorough diagnosis will tell you which is appropriate.
What should you do to fix the code P0507?
- Replace any damaged vacuum hoses found in your diagnosis.
- Replace the IAC valve if it failed step 6 of your diagnosis.
- Clear all trouble codes, then test drive and re-scan your vehicle. If the symptoms persist and the code comes back, continue with the steps below.
- Especially if you drive a Nissan, your idle air procedure may need to be relearned. Take your vehicle to a mechanic to have this procedure performed. This may be a fix for other manufacturers, as well.
- If the code still does not clear, you may need to replace either the throttle body or the power steering pressure switch. These parts can be tricky and expensive to replace, so you shouldn’t take this step until you’re sure there are no leaks or stuck valves.
Tips to avoid P0507 in the future
The more miles are on your engine, the more carbon build-up there’s likely to be on the throttle body. Once your car is over 100,000 miles, regularly check your throttle body for build-up. Cleaning it is simple and can prevent clogs elsewhere in the system.