What Causes P0507 Code? Tips to Diagnose and Solve High Idle Issues

Dealing with engine trouble codes can be frustrating and confusing for car owners.

P0507 is a common code that indicates higher than normal engine RPM at idle.

  • What the code means
  • Common symptoms
  • Potential causes
  • How to diagnose the issue
  • Repair and maintenance tips
  • Prevention of future P0507 occurrences

Getting to the bottom of a P0507 code doesn’t have to be difficult. With some basic information and a systematic approach, you can identify and address the problem in your vehicle.

What Does P0507 Code Mean?

The P0507 code is triggered when the powertrain control module (PCM) detects higher than expected RPM from the engine while idling. Most PCMs are programmed to flag P0507 if idle RPM exceeds the normal range by 200 RPM or more.

Essentially, P0507 means the engine is revving faster than it should when the vehicle is stopped and in park or neutral.

The idle air control (IAC) system is responsible for managing idle speed and works in conjunction with the PCM. The main component in this system is the idle air control valve (also called idle air motor or actuator). It meters the amount of air needed to keep the engine idling at the proper RPM.

Symptoms of P0507 Code

In most cases, the check engine light will illuminate if P0507 is present. However, the higher idle RPM also produces some noticeable symptoms:

  • Excessively high or erratic idle speed when stopped
  • Engine noises louder than normal at idle
  • Rough, jumping or fluctuating idle
  • Occasional stalling at stops
  • Reduced response or lack of power when accelerating from idle

If you notice any of these symptoms paired with illumination of the check engine light, it likely indicates an issue triggering the P0507 code.

What Causes P0507 Code?

There are a number of different things that can trigger the P0507 trouble code, including:

Faulty Idle Air Control Valve

The most common cause is a malfunctioning idle air control valve. The valve can get stuck open, closed, or fail to open or close properly. This allows too much or too little air into the engine at idle, causing higher RPM outside the normal parameters.

Vacuum Leaks

Leaks in the intake manifold or other vacuum system components can throw off the air balance at idle and cause higher RPM. Even small leaks allow extra, unmetered air to reach the engine.

Throttle Body Issues

Carbon buildup, dirty throttle plates or a faulty throttle position sensor can lead to throttle body problems that impact idle speed control.

Other Sensor Failures

Issues with the coolant temperature sensor, vehicle speed sensor, MAP sensor or fuel trim levels can provide faulty data to the PCM and lead to a P0507 code.

EVAP System Leaks

A leak or crack in evap system hoses can allow vapor into the intake system and skew idle control.

EGR Valve Leak

A stuck open EGR valve also allows excess air to reach the combustion chambers.

Electrical Problems

Damaged wiring, bad grounds, or faults in the IAC circuitry may prevent proper idle control.

As you can see, P0507 has quite a few potential root causes. To accurately diagnose the specific problem, we need to dig into some troubleshooting and testing.

Diagnosing P0507 Code

Diagnosing P0507 involves a systematic approach to isolating the root cause. Here are the general steps:

Confirm the Code

Connect a scan tool and verify that P0507 is present. Clearing codes can help determine if it’s an ongoing issue. If P0507 resets after driving, it confirms there is still an underlying problem.

Check for Vacuum Leaks

Visually inspect all intake components for cracks, loose clamps, or detachments that could cause leaks. Spraying carb cleaner near components and listening for changes in idle speed can help isolate small leaks.

Inspect Throttle Body

Check for carbon buildup in the throttle body that could impede air or the throttle plate operation. Make sure the plates move freely from open to closed.

Review IAC System Data

Use scanner data to check IAC position and the commanded versus actual idle RPM values. Compare to specs to check for irregularities.

Check Other Sensors

Inspect components like the MAP sensor, coolant temperature sensor, vehicle speed sensor and oxygen sensors. Faulty values from these can affect fuel delivery and idle control.

Electrical Inspection

Check wiring condition and probe IAC control circuits for problems. An improper power or ground connection can prevent normal IAC function.

By following this diagnostic routine, you can zero in on the specific reason for the P0507 code for repair.

How to Fix P0507 Code

Repairs will depend on the particular cause identified during diagnosis:

  • IAC valve – Replace the idle air control valve if found to be damaged or non-functional. Use a scan tool to initialize and calibrate the new valve.
  • Vacuum leaks – Inspect all intake components carefully and replace any vacuum hoses, gaskets, or connections that are leaking.
  • Throttle body – Clean carbon deposits from the housing and ensure the throttle plate moves freely. Replace the throttle body if faulty.
  • Sensors – Replace any engine management sensors like coolant temperature, MAP or O2 that are reading out of range.
  • Electrical – Repair any damaged PCM or IAC valve wiring. Clean connections and check grounds.
  • EGR valve – Replace the valve if a faulty EGR system is directing too much exhaust gas into the intake at idle.

Proper repair of the root problem is the only way to permanently resolve a P0507 code. Once repairs are complete, clear codes and road test the vehicle to verify normal idle operation before normal use.

Tips to Prevent P0507 Code

You can take some proactive steps to help avoid P0507 trouble codes down the road:

  • Use high quality gasoline to prevent carbon buildup
  • Change air filters regularly and clean mass air flow sensors
  • Watch for deteriorating vacuum hoses and replace early
  • Clean the throttle body every 30,000 miles
  • Address weak fuel trim levels that could impact idle
  • Fix small oil leaks that may lead to vacuum leaks over time
  • Consider regular professional maintenance services

Routine maintenance and care for your engine and fuel system will minimize the chances of P0507 code occurrences. But over time, component failures can still occur.

If the check engine light illuminates with reduced engine performance, be sure to scan for codes and diagnose the cause. With the information above, you’ll be prepared to accurately troubleshoot P0507 when it arises.

Frequently Asked Questions About P0507 Code

Is it safe to drive with P0507 code?

In most cases, the vehicle is safe to drive for short trips with a P0507 code. However, extended driving is not recommended as the unchecked high idle can lead to further issues over time. Schedule repair as soon as conveniently possible.

What repairs are needed to fix P0507?

It depends on the root cause, but common repairs include replacing idle air control valves, servicing throttle bodies, replacing sensors, fixing vacuum leaks, and repairing electrical problems in the IAC system.

Can P0507 cause engine damage?

Not immediately, but continual high idle RPM can put unnecessary strain on the engine. Prolonged driving with P0507 could lead to premature engine component wear over time.

Will a P0507 code clear itself?

The code will not clear on its own. The underlying issue causing the high idle RPM needs to be properly diagnosed and repaired to clear the code. A scan tool reset can temporarily clear it, but the code will return if the problem persists.

How much does it cost to fix P0507?

Simple repairs like vacuum leaks may cost $200 or less. More involved repairs like IAC valve or throttle body replacement typically run from $400 to $800. Costs ultimately depend on the specific fix needed.


Dealing with P0507 high idle RPM trouble codes can be annoying, but a bit of diligence goes a long way.

By understanding the meaning of P0507, recognizing key symptoms, and using a systematic diagnostic approach, you can get to the bottom of idle issues promptly.

Addressing the root cause, whether it be component failures or maintenance oversights, provides a reliable fix.

Implementing preventative care for your engine and fuel system is also recommended to help avoid P0507 occurrences down the road.

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