Your Nissan is sitting at idle and spinning higher than normal. Maybe 1,200 RPM. Maybe 1,500 or more. The check engine light is on and your scanner is showing P0507. Before you start shopping for parts, there is something specific about how Nissan handles idle control that changes how you diagnose this code compared to other brands.
P0507 means the ECM has detected that engine RPM at idle is more than 200 RPM above the target idle speed for a sustained period and cannot bring it down through normal idle control adjustments. On most modern Nissan vehicles, including the Altima, Maxima, Sentra, Rogue, and Pathfinder, idle speed is controlled by the Electronic Throttle Control (ETC) system. There is no separate Idle Air Control (IAC) valve as a standalone component. Everything runs through the electronic throttle body. That distinction matters for diagnosis.
The Critical First Step That Most Guides Skip: The Nissan Idle Air Volume Learning Procedure
Here is the thing about P0507 on Nissan vehicles that most generic OBD code guides fail to mention: sometimes the code has no failing hardware at all. The ECM stores a “learned” ideal throttle position for idle, and when that calibration gets corrupted, which happens after a battery disconnect, after throttle body cleaning, or after any significant air intake work, the ECM loses its reference point and the idle runs high while it tries to compensate.
The Nissan Idle Air Volume Learning (IAVL) procedure resets and relearns the correct throttle baseline. Before you clean anything, replace anything, or spend a dollar on parts, try this procedure first if the high idle appeared after recent maintenance.
The Nissan IAVL Procedure
1. Make sure the engine is fully warmed to operating temperature and all accessories are off (AC, lights, blower, radio).
2. With the engine running turn it off and wait at least 10 seconds.
3. Turn the ignition ON but do not start the engine. Wait 3 full seconds.
4. Fully depress and release the accelerator pedal five times within 5 seconds.
5. Wait 7 seconds. Then fully depress the accelerator pedal and hold it for 20 seconds until the check engine light stops blinking and stays solid.
6. Release the pedal within 3 seconds.
7. Start the engine and let it idle without touching the gas pedal. The idle should settle to normal within 3 to 5 minutes.
If the idle normalizes and the code does not return, the IAVL relearn fixed it. If the idle is still high, move to the physical causes below.
Cause 1: Dirty Throttle Body (Most Likely Physical Cause)
Carbon deposits build up on the throttle plate and throttle bore walls over time, particularly if the engine has high mileage or uses synthetic oil that burns differently than conventional oil. The deposits effectively hold the throttle plate slightly open at idle, allowing more air through than the ECM commands. The ECM detects the resulting high idle, tries to close the throttle further but cannot because the deposits physically prevent full closure, and stores P0507.
How to Clean the Throttle Body on a Nissan
Remove the air intake tube from the throttle body. With the engine off, spray throttle body cleaner directly onto the throttle plate and the surrounding bore. Use a lint-free cloth or soft brush to remove the carbon deposits. Work around the full circumference of the bore. Do not force the throttle plate open beyond its natural position. After cleaning, reconnect the intake tube and immediately perform the IAVL procedure above. A clean throttle body without the relearn will still produce P0507 on Nissan because the ECM has not updated its position reference.
Cause 2: Vacuum Leak in the Intake System
An unmetered air leak anywhere downstream of the mass airflow sensor introduces air the ECM cannot account for. The ECM detects the resulting lean condition, adds fuel to compensate, and the engine idles high because there is simply more air in the cylinders than commanded. Unlike a dirty throttle body, a vacuum leak causes both P0507 and often P0171 (system too lean) simultaneously. If you have both codes, the leak is the priority diagnosis.
Finding the Vacuum Leak
Inspect the large intake boot between the air filter housing and the throttle body for cracks, splits at the accordion folds, and any loose hose clamp connections. Check every small vacuum hose connection at the intake manifold and throttle body. The PCV hose is a particularly common source on high-mileage Nissans: the rubber becomes brittle and cracks at the manifold connection. The soapy water spray method works for accessible connection points. A smoke machine is the only reliable method for leaks inside the manifold or behind inaccessible components.
Cause 3: PCV Valve Stuck Open
The Positive Crankcase Ventilation (PCV) valve controls the flow of crankcase blowby gases into the intake manifold. When this valve sticks in the fully open position, it acts as a large, uncontrolled vacuum leak that pulls excessive air into the intake. The result is a lean condition and elevated idle. The PCV valve is inexpensive ($8 to $25) and easy to test without tools.
How to Test the PCV Valve
Remove the PCV valve from the valve cover. Shake it: a healthy PCV valve should rattle clearly as the internal plunger moves. No rattle means the valve is stuck and needs replacement. You can also blow through the valve from the manifold end: it should allow flow. Then try to blow from the crankcase end: it should restrict flow (it is a one-way valve). If it flows freely in both directions, it is stuck open. Replace the PCV valve and retest.
Cause 4: Faulty Throttle Position Sensor or Electronic Throttle Body
If cleaning the throttle body, performing the IAVL, fixing vacuum leaks, and replacing the PCV valve all fail to resolve P0507, the electronic components inside the throttle body may have failed. The throttle position sensor (TPS) provides feedback to the ECM on actual throttle plate position. A failed TPS sends incorrect position data, and the ECM cannot properly control idle. In rare cases the throttle body motor itself fails.
Confirming a Throttle Body Electrical Failure
Use a scan tool with live data to watch throttle position percentage while the engine idles. The throttle should be at 0 percent or near-0 percent at idle with no pedal input. If it shows 5 to 15 percent with no pedal input, the TPS is reading incorrectly or the throttle plate is not physically closing. On Nissan, the TPS is integrated into the electronic throttle body assembly and cannot be replaced separately on most models. A faulty throttle body assembly runs $200 to $400 OEM.
Try In This Order | Cost | How to Confirm | Fix |
|---|---|---|---|
IAVL relearn procedure | Free | Idle settles after procedure; no code return | Perform IAVL after any air intake or battery work |
Clean throttle body | $8-$12 | Visible carbon on throttle plate and bore | Clean + perform IAVL immediately after |
Vacuum leak | Free-$150 | P0171 also present; smoke test or soapy water | Replace cracked hoses; tighten connections |
PCV valve stuck open | $8-$25 | No rattle when shaken; flows both directions | Replace PCV valve |
Faulty TPS or throttle body | $200-$400 | Throttle % not near zero at idle on live data | Replace throttle body assembly |
Frequently Asked Questions
What does P0507 mean on a Nissan?
P0507 means the engine idle speed is more than 200 RPM above the target idle speed and the ECM cannot reduce it through normal idle control adjustments. On Nissan vehicles with Electronic Throttle Control, this is most commonly caused by a dirty throttle body whose carbon deposits prevent the throttle from fully closing, a vacuum leak allowing unmetered air in, or a lost idle calibration requiring the IAVL relearn procedure.
Why is my Nissan idling high after a battery disconnect?
Disconnecting the battery erases the ECM’s learned idle calibration. On Nissan vehicles, the Electronic Throttle Control system needs to relearn the correct throttle plate position for idle after any battery event. The Idle Air Volume Learning (IAVL) procedure restores this calibration. Without it, the idle will run 200 to 500 RPM higher than normal and P0507 may be stored.
Can I drive with P0507?
Yes for short distances. The engine runs higher than normal at idle but is not in danger of immediate mechanical failure from this code. Extended high idle increases fuel consumption and can cause rough or harsh gear selection in automatic transmissions. Fix it within the week rather than monitoring it indefinitely.
The Bottom Line
P0507 on a Nissan almost always has one of three causes: a dirty throttle body preventing full closure, a vacuum leak adding unmetered air, or a lost idle calibration that the IAVL relearn fixes in five minutes. Start with the IAVL procedure if the high idle appeared after any maintenance. Move to throttle body cleaning and the PCV valve if that does not resolve it. A smoke test for vacuum leaks covers the rest. A faulty throttle body assembly is the last resort and rarely the first cause.